Guinness World Records (General Knowledge Focus) MCQs with Answers & Explanations (Page 487)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.