TestPoint Everyday Science Solved Question Bank - Part 18
Practice and review TestPoint Everyday Science Solved Question Bank - Part 18 with verified questions, correct answer keys, and detailed solutions.
Model Practice Questions & Solutions
96 questions (95 solved, 1 official sample questions)
Hydrometer is used to determine _____?
Explanation A hydrometer is an instrument used to measure the specific gravity of liquids. It works based on the principle of buoyancy . It is widely used to test milk, alcohol, and battery acid . Commonly used in laboratories and industries . Last verified on 30-01-2026
Urea fertilizer contains ______% nitrogen.
Explanation Urea fertilizer contains 46% nitrogen (N) . Urea is a white crystalline solid . It is widely used as a fertilizer and animal feed additive. Last verified on 31-01-2026
Rearing of honeybees is?
Explanation Apiculture is the practice of rearing honeybees for honey and wax production . Helps in pollination and increasing crop yields . Honey, beeswax, and propolis are valuable products from apiculture . Additional information : Sericulture → Rearing of silk worms. Silviculture → Cultivation of trees and forests. Last verified on 30-01-2026
The study of tissues is called _____?
Explanation The study of tissues is called Histology . It involves examining the structure, composition, and function of cells and tissues under a microscope. Additional information : Geology is the study of rocks and Earth's structure. Radiology is the study of medical imaging techniques like X-rays and MRI. Last verified on 22-01-2026
Germ theory of disease is given by ____?
Explanation Germ Theory of Disease states that microorganisms (germs) cause diseases. Proposed by Louis Pasteur (1822 - 1895), a French scientist. This theory revolutionized medicine , leading to vaccines and sterilization methods. Additional information : Robert Koch later developed techniques to identify specific germs for specific diseases. Last verified on 29-01-2026
When AlCl₃ is heated, it converts into Al₂Cl₆. What type of bonding is present in Al₂Cl₆?
Explanation When AlCl₃ is heated, it dimerizes to Al₂Cl₆ . In Al₂Cl₆ , each Al atom shares electrons with a Cl atom from the other AlCl₃ unit , forming covalent coordinate (dative) bonds . Additional information : Al₂Cl₆ exists as a dimer in the gas phase, which is electron-deficient and demonstrates Lewis acid behavior. Last verified on 28-01-2026
The normal ranges of respirations in an adult are:
Explanation A normal resting respiratory rate for a healthy adult is typically 12 to 20 breaths per minute (bpm) . Abnormal Rates: A rate below 12 or over 25 breaths per minute while resting may indicate an underlying health issue. Variations: Rates can be higher in the elderly (often >28 is considered high) or during physical exertion.
How many states of matters are there?
Explanation There are four fundamental states of matter: solid, liquid, gas and plasma Solid: Fixed shape and volume; particles tightly packed. Liquid: Fixed volume but takes container's shape; particles close but move . Gas: No fixed shape or volume; particles far apart and move freely. Plasma: Ionized gas, found in stars, lightning; electrically charged.
A species that no longer lives anywhere on the earth is called _____?
Explanation A species that no longer lives anywhere on the e arth is called extinct. This term refers to a species that has no living individuals remaining on the planet, often determined when the last surviving member dies. Examples: Well-known examples include the dinosaur, the woolly mammoth, and the passenger pigeon.
Fruits are ripened by which element?
Explanation The ripening of fruits is a biochemical process. Oxygen is essential for cellular respiration, which drives ripening. It helps in conversion of starches to sugars and softening of fruit tissue. Controlled oxygen levels are used in storage and packaging to manage ripening.
What is the purest form of coal?
Explanation Anthracite is the highest grade of coal with the highest carbon content. It has low moisture and impurities, making it very efficient as fuel. It burns cleanly and produces more heat compared to other types of coal. Other forms like lignite and bituminou s have higher moisture and lower carbon.
Sucrose is a disaccharide and is a combination of which two monosaccharides?
Explanation Sucrose is a common disaccharide found in sugarcane and sugar beet. It is formed by linking one glucose molecule and one fructose molecule. The bond between them is a glycosidic linkage. Disaccharides are broken down int o monosaccharides during digestion.
Where is sugar attached with CO₂ in the chloroplast?
Explanation In chloroplasts, the Calvin cycle occurs i n the stroma. CO₂ is fixed and converted into sugars in this area. Thylakoids are the site of light-dependent reactions, not sugar formation. Stroma contains enzymes needed for carbon fixation.
Which percent of Earth's area is required to maintain environmental stability?
Explanation Scientists estimate that 33% of the Earth's area should be conserved. This helps maintain biodiversity and ecological balance. Protected areas include forests, wetlands, and marine zones.
Enzymes that scan DNA for specific 4 - 8 base pair recognition sites are called?
Explanation Restriction enzymes (also called restriction endonucleases) recognize specific DNA sequences. These sequences are usually 4 - 8 base pairs long. The enzymes cut DNA at or near these recognition sites. They are widely used in molecular biology and genetic engineering. Restriction enzymes allow scientists to manipulate DNA for cloning and analysis.
S-waves (secondary waves) can pass through which medium?
Explanation S-waves are transverse seismic waves. They cause particles to move perpendicular to the direction of wave propagation. S-waves cannot pass through liquids or gases because these cannot support shear stress. They only travel through solids, like the Earth's crust and mantle. This property helps scientists study the internal structure of Earth.
After arrival in the dairy industry, milk is poured into what?
Explanation When milk reaches the processing plant, it is poured into silos for storage. Silos are large containers tha t keep milk fresh and uncontaminated. They allow controlled temperature to prevent spoila ge. From silos, milk is later processed fo r pasteurization, packaging, and distribution. Using silos ensures efficien t storage and handling in the dairy industry.
Sedimentation is the primary process of?
Explanation Sedimentation is the process where solid particles settle at the bottom of a liquid. It is a primary method in water treatment. Sedimentation removes suspended solids from water. It helps in clarifying wat er before filtration. This process is essential for providing clean drinking water.
Droughts can lead to wildfires due to?
Explanation Drought causes reduced rainfall, drying out soil and plants. Dry vegetation becomes highl y flammable, increasing wildfire risk. High temperatures further intensify fire outbreaks. These factors together make wildfires more frequent and severe. Therefore, drought-induced wildfires occur due to all of these factors
The factory of ribosomes is?
Explanation The nucleolus is known as the factory of ribosomes . The nucleolus is a dense region inside the nucleus. It is responsible for producing ribosomal RNA (rRNA). Ribosomes are assembled in the nucleolus before entering the cytoplasm. Ribosomes play a key role in protein synthesis.
Steel cans of drinks are coated with?
Explanation Steel cans are coated with tin to prevent rusting and corrosion. Tin provides a protective layer between steel and the beverage. This ensures the drink remains safe and hygienic.
The arrangement of proteins in DNA begins with which codon?
Explanation AUG is the start codon in mRNA that signals th e beginning of protein synthesis. It codes for the amino acid Methionine in eukaryotes. During translation, ribosomes recognize AUG to initiate protein assembly. Stop codons like UAA, UAG, and UGA signal the end of translation.
The chemical name of quartz is:
Explanation The chemical name for quartz is silicon dioxide Chemical Formula: SiO₂ Composition: Silicon (Si) and Oxygen (O) Structure: A framework of silicon-oxygen tetrahedra Common Names: Silica, Rock Crystal (for the clear variety)
Enzymes are primarily made up of which structure?
Explanation Enzymes are proteins in nature. Proteins are composed of one or more polypeptide chains. The polypeptide folds into a specifi c three-dimensional shape. This shape determines the enzyme's active site and function. Therefore, the basic structure of an enzyme is a polypeptide.
Olive, nuts, and avocado are rich in _____?
Explanation Olive, nuts, and avocado are rich sources of healthy fats and oils . These fats provide energy and help in absorption of fat-soluble vitamins . Additional information : These foods also provide antioxidants, vitamins, and minerals , making them heart-healthy. Last verified on 27-01-2026
Loss of internal water of plant in the form of vapours from aerial parts of plants is called?
Explanation Transpiration is the process by which plants lose water in the form of vapor from leaves, stems, and flowers. It helps in cooling the plant, nutrient transport, and maintaining water balance. Additional information : Evaporation : Water loss from soil or water surfaces Respiration : Energy release by breaking down sugars Photosynthesis : Production of food using sunlight, CO₂, and water Last verified on 27-01-2026
Plants that bear flowers and produce seeds are called _____?
Explanation Spermatophytes are plants that produce seeds and usually bear flowers or cones. They are the most advanced group of plants . Additional information : Spermatophytes : Angiosperms (flowering plants) and Gymnosperms Bryophytes : Non-vascular, no seeds Pteridophytes : Vascular but seedless Last verified on 27-01-2026
Which is not a part of Pakistani smog?
Explanation Oxygen is a vital component of the Earth's atmosphere (making up about 21%) and is essential for life Therefore, oxygen is not considered a part of smog. Smog in Pakistan mainly consists of h armful air pollutants. These includ e sulphur dioxide, nitrogen oxides, and carbon monoxide.
What property describes the tensile strength of bone?
Explanation Tensile strength refers to a material's ability to resist being pulled apart. Bones have collagen fibers that provide high tensile strength. This allows bones to withstand forces that try to stretch or bend them.
Which scientist is credited with defining the wave theory of light?
Explanation Christiaan Huygens (1629 - 1695) proposed the wave theory of light. He suggested that light travels in th e form of waves, not particles. Huygens' principle explains how light waves propagate, reflect, and refract. This theory challenged Newton's particle theory of light.
What type of chemical bond shares electrons and is strong?
Explanation A covalent bond is formed when two atom s share one or more pairs of electrons. This sharing creates a strong bond between the atoms, holding molecules together.
Bees must collect nectar from approximately how many flowers to make 1 pound of Honeycomb.
Explanation Bees must collect nectar from approximately 2 million flowers to make 1 pound of honey. This immense effort requires bees to fly roughly 55,000 to 90,000 miles A honey bee visits 50 to 100 flowers during a single, , dedicated collection trip. Production Context: It takes approximately 556 worker bees to gather enough nectar for 1 pound of honey.
Which filament gives stability to bones?
Explanation Collagen is a structural protein that f orms strong fibers in bones. It provides tensile strength and flexibility, preventing bones from breaking easily. Collagen works together with calcium phosphate to maintain bone rigidity. Loss of collagen with age can lead to brittle bones and osteoporosis.
Water moving into the soil is called?
Explanation I nfiltration is the process by which w ater enters the soil from the surface. It helps replenish groundwater and maintain soil moisture. Additional information Percolation is the downward movement of water through soil layers. Evaporation is the conversion of water into vapor, and transpiration is water loss from plants.
The final stage in an ecosystem is called?
Explanation An ecosystem develops through a series of successional stages. The final, stable stage is called the climax community. It is characterized by a balanced and self-sustaining ecosystem.
Power of radiations emitted by a star is called?
Explanation Luminosity is the total amount of energy a star emits per second. It depends on the star's size and temperature. Brightness is how bright the star appears from Earth, which can vary with distance. Magnitude is a scale t o measure stellar brightness.
Brackish water is usually found in which of the following?
Explanation Brackish water is a mixture of fresh water and salt water It is most commonly found in estuaries The salinity in estuaries is higher than freshwat er but lower than seawater.
P waves have what speed compared to S waves during an earthquake?
Explanation P waves (primary waves) are the fastest seismic waves generated during an earthquake. They travel through solids, liquids, and gases, compressing and expanding the material. S waves (secondary waves) are slower and c an only move through solids. P waves are the first to be detected by seismographs. Their higher speed helps in early warning systems for earthquakes.
Which is a non-carbon source for glucose synthesis?
Explanation Glucose is mainly synthesized in plant s through photosynthesis. Carbon dioxide provides the carbon atoms needed for glucose formation. Water (H₂O) provides hydrogen and electrons but does not contribute carbon.
A neutron is converted into a proton with the emission of which particles?
Explanation During beta-minus (β⁻) decay, a neutron transforms into a proton. This process emits an electron (β⁻ particle) from the nucleus. Along with the electron, an antineutrino is also emitted to conserve energy and momentum. This conversion increases the atomic number of the element by one. Beta decay is common in unstable isotopes trying to achieve nuclear stability.
The main purpose of cellular respiration is ________?
Explanation The main purpose of cellular respiration is to convert chemical energy stored in nutrients (specifically glucose) into ATP (adenosine triphosphate), They acts as the usable energy currency for cellular processes. It breaks down glucose in the presence of oxygen to produce ATP, carbon dioxide, and water.
Poison produced by a plant is called _____?
Explanation A toxin is a poison produced naturally by a plant . It protects the plant from herbivores and pathogens . Additional information : Examples of toxic plants: Ricinus (Castor), Nerium (Oleander), Datura, Aconitum, Foxglove Last verified on 25-01-2026
Which bond provides energy for cellular activity?
Explanation Cellular activities require energy to function, which comes from molecules like ATP . ATP (adenosine triphosphate) stor es energy in its phosphate bonds. When a phosphate bond is broken, energy i s released for cellular processes. This energy powers activities like muscle contrac tion, nerve signaling, and biosynthesis. Therefore , phosphate bonds ar e the primary s ource of energy in metabolism.
Which of the following is a metabolic disease characterized by high blood sugar levels?
Explanation Diabetes mellitus is a metabolic disorder where the body cannot properly regulate blood glucose. It occurs due to insufficient insulin production or poor insulin response. High blood sugar over time can damage organs like th e heart, kidneys, and eyes. Symptoms include frequent urination, excessive thirst, and unexplained weight loss.
Noble gases have which type of bonding between them?
Explanation Noble gas atoms generally do not form bonds under normal conditions Due to their full valence electron shells , making them highly stable and inert. However, under extreme pressure, low temperatures, or with highly reactive elements like fluorine and oxygen, They can form compound bonds, primaril y involving heavier gases like xenon.
Which particle is emitted during beta decay?
Explanation Beta decay emits high-energy, high-speed particles, Specifically, an electron along with an antineutrino, or a positron along with a neutrino These particles are emitted from the atomic nucleus to achiev e a more stable neutron-to-proton ratio.
Fossil fuels are rich in which elements?
Explanation Fossil fuels like coal, oil, and natural gas are primarily composed of carbon and h ydrogen. These elements are stored energy from ancient plants and organisms. When burned, they release energy along wit h carbon dioxide and water. The high carbon and hydrogen content makes them excellent sources of fuel. Oxygen and nitrogen are present in very small amounts compared to carbon and hydrogen.
LPG (Liquefied Petroleum Gas) mainly consists of which compounds?
Explanation LPG (Liquefied Petroleum Gas) Mainly consists of hydrocarbons like propane and butane . These are gases composed of hydrogen and carbon atoms. It is used as fuel for cooking and heating .
Air mass moves from which pressure region?
Explanation Air always moves from regions of high pressure to low pre ssure. This movement creates win d and drives weather patterns. The greater the pressure difference, the stronger the wind. High-pressure areas are usually associated with clear skies. Low-pressure areas often brin g clouds and precipitation.
Where does a comet reach its maximum speed?
Explanation A comet moves fastest when it is closest to the Sun, called perihelion. The Sun's gravity pulls the com et strongly, increasing its speed. At aphelion (farthest point from the Sun), its speed is much slower. This follows Kepler's laws of planetary motion. The increase in speed also causes the comet' s tail to become more visi ble.
Solar energy is produced by which process?
Explanation The Sun produces energy through nuclear fusion in its core. In fusion, hydrogen nuclei combine to form helium, releasing huge energy. This energy radiates as sunligh t, heat, and solar radiation. Fusion is different from fission, which splits heavy nuclei. Solar energy powers life on Earth and can be harnessed for electricity.
The Submandible is located near:
Explanation Submandible refers to the area under the lower jaw (mandible). It is close to th e ear region. It contains submandibular glands, which are salivary glands.
The bacteria which convert nitrite (NO₂⁻) to nitrate (NO₃⁻) is _____?
Explanation Nitrobacter bacteria convert nitrite (NO₂⁻) into nitrate (NO₃⁻) in the soil. This is the second step of the nitrification process , which is important for plant nutrition. Nitrite is toxic to plants, but nitrate is easily absorbed as a nutrient. Last verified on 22-01-2026
A comet moves with maximum speed at?
Explanation Perihelion is the point in a comet 's orbit closest to the Sun. According to Kepler's Second Law, a comet moves faster when closer to the Sun. Aphelion is the farthest point from th e Sun, where speed is minimum. The increase in speed is due to Sun's gravitational pull. This principle applies to all celestial bodies in elliptical orbits.
The fundamental unit of plant and animal tissue is?
Explanation A cell is the basic structural and functional unit of life. All plant and animal tissues are made up of cells. Nitrogen, phosphorus, and oxygen are elements , not units of tissue.
The outer layer of the seed coat is called _____?
Explanation The seed coat protects the embryo inside the seed. The outermost layer of the seed coat is called Testa . It acts as a barrier against mechanical damage, pathogens, and water loss . Additional information : Testa may have hair, wax, or spines in some seeds. Plays a role in seed dormancy and protection . Last verified on 25-01-2026
Young ones of a fly are called _____?
Explanation The young ones of a fly hatch from eggs and are worm-like in appearance. These young ones are called Maggots . Additional information : Stages of a fly's life cycle (Complete Metamorphosis): Egg - laid on decaying organic matter Maggot (larva) - feeding stage Pupa - transformation stage Adult fly - reproductive stage Common fly species - Housefly, Blowfly, Fruit fly Last verified on 24-01-2026
Insects after complete metamorphosis - the stage before becoming adult - is called ______?
Explanation Insects with complete metamorphosis pass through four stages: egg → larva → pupa → adult . The pupa stage is when the insect transforms inside a cocoon or protective casing . Additional information : Pupa stage is also called the resting stage or chrysalis stage Last verified on 24-01-2026
The petals of a flower collectively form _____?
Explanation A flower is made of different parts: Calyx, Corolla, Androecium, and Gynoecium . Petals are usually colorful and fragrant to attract pollinators. All petals together form a distinct part called the Corolla . Additional information : Calyx is made of sepals, usually green, protecting the bud. Gynoecium is the female reproductive part of a flower (carpel/pistil). Last verified on 23-01-2026
Non-primary essential nutrient is ______?
Explanation Nutrients required by plants are classified into primary, secondary, and micronutrients . Primary nutrients: Nitrogen (N), Phosphorus (P), Potassium (K). Additional information : Secondary nutrients: Calcium (Ca), Magnesium (Mg), Sulfur (S). Calcium strengthens cell walls and helps in growth of root and shoot tips. Last verified on 23-01-2026
Endogenic process requiring light and water to produce glucose is ______?
Explanation Photosynthesis is an endogenic process in plants, meaning it produces energy-rich compounds. Requires light, water, and carbon dioxide to produce glucose and oxygen. Additional information : Formula: 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂ Occurs in chloroplasts , primarily using chlorophyll pigments. Last verified on 23-01-2026
Leaf area reduction due to parasite is called _____?
Explanation Leaf area reduction occurs when parasites attack a plant, causing loss of tissue or shrinkage . This reduction in size or function of the leaf is called atrophy . Additional information : Atrophy reduces photosynthetic efficiency of plants. Common causes: parasitic plants, insects, or nutrient deficiencies . Last verified on 23-01-2026
Death of tissues is called _____?
Explanation Tissue death can occur naturally or due to injury, infection, or stress. Necrosis is the death of living tissues, often uncontrolled . Additional information : Apoptosis is programmed cell death, a controlled process at the cellular level. Plasmolysis is shrinkage of plant cells due to water loss. Last verified on 23-01-2026
Response of plants to touch is called _____?
Explanation Plants can respond to various stimuli like light, gravity, and touch . The response of plants to touch is called thigmotropism . It is commonly seen in climbing plants and vines , which coil around supports. Last verified on 23-01-2026
In oomycetes, a group of fungi, the cell wall is made of _____?
Explanation Oomycetes are fungus-like organisms, often called water molds . Although they resemble true fungi , their cell wall composition is different. In oomycetes, the cell wall is mainly composed of cellulose . Additional information : True fungi have chitin in their cell walls, while oomycetes have cellulose. A common example of oomycetes is Phytophthora , which causes plant diseases. Last verified on 23-01-2026
Safflower inflorescence is _____?
Explanation Inflorescence refers to the arrangement of flowers on a plant. Safflower (Carthamus tinctorius) belongs to the family Asteraceae . Plants of this family typically bear flowers in a capitulum (head) type inflorescence. Additional information : Capitulum is also called a head inflorescence . Common examples: sunflower, marigold, and safflower. Last verified on 23-01-2026
The phase of the cell cycle in which DNA synthesis occurs is _____?
Explanation The cell cycle is the sequence of stages a cell goes through to grow and divide. DNA synthesis (replication) occurs during the S Phase (Synthesis Phase). Additional information : G₁ Phase - cell growth before DNA replication G₂ Phase - preparation for cell division after DNA replication M Phase - actual mitosis/cell division Last verified on 22-01-2026
About 80 - 90% of living animals in soil are ______?
Explanation Soil is home to a wide variety of living organisms that maintain soil fertility. Nematodes make up 80 - 90% of the living animals in soil. Additional information : Nematodes are microscopic roundworms found in almost all soils. They help control pests and recycle nutrients for plants. Last verified on 22-01-2026
The range of light absorbed by plants for photosynthesis is approximately?
Explanation Plants absorb light for photosynthesis mainly using chlorophyll pigments. The effective range of light absorbed is the visible spectrum that drives photosynthesis. Light outside this range is less effective for producing energy in plants. Last verified on 22-01-2026
Chlorophyll is present in ______?
Explanation Chlorophyll is a compound that is called a Chelate . Photosynthesis depends on the presence of chlorophyll for the absorption of light. Additional information : There are about six closely related chlorophylls: chlorophyll a chlorophyll b chlorophyll c chlorophyll d chlorophyll e chlorophyll f Last verified on 22-01-2026
In honeybees, the queen and worker bees are _____?
Explanation Honeybees have a unique sex-determination system called haplodiploidy . Queen and worker bees develop from fertilized eggs, making them diploid . Additional information : Drones (male bees) develop from unfertilized eggs and are haploid . This system helps maintain colony structure and division of labor . Last verified on 22-01-2026
A group of plants sharing the same characteristics and environment is called _____?
Explanation Plants are classified based on shared characteristics and natural environment. A plant species is the basic unit of classification where plants can reproduce among themselves. Additional information : A species is capable of natural reproduction within its group. Example: Triticum aestivum (common wheat) is a plant species. Last verified on 22-01-2026
Study of the evolution of man as an animal is known as?
Explanation The study of humans has multiple branches focusing on biology, culture, and history. Anthropology specifically studies the evolution and biological development of humans . It examines humans as part of the animal kingdom and their physical, social, and cultural traits . Last verified on 22-01-2026
The process of converting double-stranded DNA to single-stranded DNA is called _____?
Explanation The process of converting double -stranded DNA into single -stranded DNA is called denaturation . It occurs when hydrogen bonds between base pairs break due to heat, extreme pH, or chemicals . Denaturation is essential in molecular biology techniques like PCR to separate DNA strands . Last verified on 22-01-2026
A part of maize seed that contains stored food is called?
Explanation The endosperm is the main storage tissue in maize seeds. It containing nutrients like starch, proteins, and oils. It support the growth of the embryo during germination. Last verified on 22-01-2026
The first process in Petroleum refinery is known as ____?
Explanation The first process in a petroleum refinery is Distillation . It is also known as Fractional Distillation . This process separates crude oil into various fractions or types of hydrocarbons , based on their boiling points and molecular weights. Additional information : The processes in a petroleum refinery: Cracking Reforming Isomerization Hydrotreating Hydrocracking Catalytic Cracking Alkylation Last verified on 22-01-2026
What is the location of flat bones in humans?
Explanation Flat bones are found in areas like the skull and ribs . They providing protection and surface for muscle attachment . They are thin and flattened compared to other bone types.
If there were no atmosphere what would be the color of the sky?
Explanation If Earth had no atmosphere, the sky would a ppear black even during the day, Hence, the sky would appear black, just like it does from space .
Widows tears is the name of?
Explanation "Widow's Tears" is a common name for several plants Most notably the Spiderwort (genus Tradescantia) and Dayflowers (genus Commelina),
Who is called the Father of French Revolution?
Explanation Jean-Jacques Rousseau is called th e Father of the French Revolution. Born on June 28, 1712 Died on July 2, 1778, at the age of 66 years.
What is the age of the Father of French Revolution (J.J Rousseau)?
Explanation Jean-Jacques Rousseau was born on June 28, 1712 Died on July 2, 1778, at the age of 66 years. He is called th e Father of the French Revolution.
In 1774 Oxygen was discovered by?
Explanation Oxygen was discovered in 1774 by English chemist Joseph Priestley, He isolated it by heating mercuric oxide and called i t "dephlogisticated air". Oxygen was discovered independently by Carl Wilhelm Scheele (around 1772)
In the history of World the Stone Age is also known by the?
Explanation The Stone Age is also known as the Paleolithic Period (Old Stone Age) for its earliest phase Mesolithic ( Middle Stone Age ) Neolithic ( New Stone Age ) Chalcolithic Period ( or Copper Age )
The mental act, condition or habit of placing trust or confidence in another shows which of the following options?
Decibel is a unit used for meaning?
Explanation Decibel (dB) measures the intensity or loudness of sound. It is a logarithmic unit, meaning eac h 10 dB increase represents a tenfold increase in intensity. Decibels are also used in electronics and signal strength measurements. It does not measure speed of light or heat. Common examples: Normal conversation ≈ 60 dB, threshold of hearing ≈ 0 dB, jet engine ≈ 120 dB.
"Southern Cross" which is the constellation found in the southern region of the night sky consists of?
Explanation The Southern Cross is also known as Crux . The constellation primarily consists of four bright stars that form a cross shape. The Four Main Stars: Alpha Crucis (Acrux): The brightest, at the bottom. Beta Crucis (Mimosa): Forms the crossbeam. Gamma Crucis (Gacrux): The northernmost star. Delta Crucis (Imai): Also part of the crossbeam. The Fifth Star: Epsilon Crucis (Ginan): Often added to complete the pattern, as seen on the flags of Australia, Brazil, and New Zealand,
Meat, vegetables, fruits, and cereals are examples of ______?
Explanation Nutritive foods supply the body with necessary nutrients for growth, energy, and repair . They include all food groups that contribute to balanced nutrition. Additional information : Cereals provide carbohydrates for energy. Vegetables and fruits provide vitamins and minerals. Meat provides proteins and iron for body-building. Last verified on 20-01-2026
Compounds having the same molecular formula but different structures are called ______?
Explanation Compounds with the same molecular formula but different arrangements of atoms are called isomers . Isomers can have different chemical and physical properties despite having the same number of atoms. Additional information : Example of isomers : C₂H₆O → Ethanol (CH₃CH₂OH) and Dimethyl ether (CH₃OCH₃) Isomerism is classified into structural isomers and stereoisomers . Last verified on 20-01-2026
Glycerin is a ____?
Explanation Glycerin (glycerol) is a colorless, odorless, and viscous liquid. It is commonly used in pharmaceuticals, cosmetics, and food products . Additional information : Glycerin is non-toxic and safe in small quantities. It acts as a humectant , helping retain moisture. Last verified on 20-01-2026
Plants that can survive in low (less) water conditions are called _____?
Explanation Xerophytes are plants adapted to survive in dry or low-water environments . They have special features to reduce water loss and store water . Additional information : Examples of xerophytes : Cactus Aloe vera Date palm Acacia Euphorbia Last verified on 19-01-2026
Meristematic cells are _____?
Explanation Meristematic cells are undifferentiated cells capable of continuous division. They are responsible for the growth of plants in length and thickness. Additional information : Types of meristems : Apical meristem - root & shoot tips Intercalary meristem - nodes & internodes Lateral meristem - increase in girth Root meristem - root growth Shoot meristem - shoot growth Last verified on 19-01-2026
Meristem has _____ form of carbohydrates in plant cells.
Explanation In plants, carbohydrates are stored mainly in the form of starch . Starch serves as an energy reserve used during growth and development . Additional information : Storage forms in plants : Starch - main carbohydrate reserve Sucrose - transport form of carbohydrate Cellulose - structural carbohydrate Glycogen - storage carbohydrate in animals Glucose - immediate energy source Last verified on 19-01-2026
Small celestial bodies made up of ice, dust and rock are known as?
Explanation Comets are small celestial bodies made of ice, dust, and rock. When they approach the Sun , they form bright tails of gas and dust . Additional information : Often called " dirty snowballs " due to icy composition . Comets follow highly elliptical orbits around the Sun. Last verified on 19-01-2026
Sugar present in DNA is _____?
Explanation DNA (Deoxyribonucleic Acid) contains the sugar deoxyribose , which is a five - carbon sugar. It forms the backbone of the DNA molecule along with phosphate groups. Additional information : Sugars in nucleic acids : DNA - Deoxyribose RNA - Ribose Glucose - energy source in cells Fructose - sugar in fruits Galactose - sugar in milk Last verified on 19-01-2026
Butterfly, moth and honeybee are _____?
Explanation Butterflies, moths, and honeybees help in transferring pollen from one flower to another, aiding in plant reproduction. They are essential for pollination of crops and wild plants . Additional information : Pollination increases fruit and seed production. Honeybees are also important for honey production. Last verified on 19-01-2026
The valency of carbon is ______?
Explanation Carbon has a valency of 4 , meaning it can form 4 covalent bonds with other atoms. This property allows carbon to form complex organic compounds . It is the backbone of all organic molecules. Additional information : Examples of Carbon Compounds (5): Methane (CH₄) Ethane (C₂H₆) Glucose (C₆H₁₂O₆) Ethanol (C₂H₅OH) Carbon dioxide (CO₂) Last verified on 19-01-2026
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