Botany MCQs
Topic Notes: Botany
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
For what primary agricultural purpose has seaweed been traditionally used for centuries?
Answer:
fertilizer
Seaweeds, particularly brown algae like kelp, have been harvested for centuries to be used as organic fertilizers. They are rich in essential minerals, trace elements, and plant growth hormones, which help improve soil structure and enhance crop productivity in coastal farming communities.
2
Which algal derivative is frequently employed to provide adhesive structure in the manufacturing of artificial silk?
Answer:
algin
Algin, or alginic acid, is a polysaccharide found in the cell walls of brown algae. It is highly valued in industrial processes for its thickening and stabilizing properties. In the textile industry, it is specifically used as a sizing agent and to provide structural integrity in the production of artificial silk fibers.
3
Which genus of bacteria is known to cause conditions such as pneumonia or urinary tract infections?
Answer:
Chlamydia
Chlamydia species, particularly Chlamydia pneumoniae, are recognized pathogens capable of causing respiratory infections like pneumonia. Additionally, certain Chlamydia strains are associated with urogenital infections. While other bacteria can also cause these conditions, Chlamydia is a well-documented causative agent in clinical settings.
4
Which chemical agent is specifically applied to living tissue to inhibit or prevent the growth of microorganisms?
Answer:
antiseptic
Antiseptics are antimicrobial substances that are applied to living tissue or skin to reduce the possibility of infection, sepsis, or putrefaction. Unlike disinfectants, which are used on non-living surfaces, antiseptics are formulated to be safe for use on biological tissues while still effectively inhibiting microbial proliferation.
5
Which organism is responsible for causing the red rust disease in coffee crops?
Answer:
cephaleuros virescens
Cephaleuros virescens is a parasitic green alga that causes red rust disease in various economically important plants, including coffee, tea, and citrus, by infecting the leaves and stems.
6
Which type of algae is frequently incorporated into culinary dishes such as puddings and soups?
Answer:
porphyra
Porphyra, a genus of red algae, is widely consumed in various cultures, particularly in East Asia. It is commonly known as nori or laver and is frequently used in soups, salads, and as a wrapping for sushi due to its nutritional value and flavor profile.
7
Which material is commonly used as a soil conditioner?
Answer:
maerl
Maerl is a type of calcified seaweed (coralline red algae) that is harvested and used as a soil conditioner. It is rich in calcium carbonate and magnesium, which helps to neutralize acidic soils and improve the overall nutrient profile and structure of the soil for agricultural use.
8
Which alga is known for its ability to colonize silicone resins?
Answer:
stichococcus bacillaris
Stichococcus bacillaris is a filamentous green alga recognized for its resilience and ability to colonize various substrates, including silicone resins. This property is significant in studies regarding bio-deterioration and the colonization of synthetic materials by microorganisms in diverse environments.
9
What term describes the phenomenon where algae accumulate on the hulls of ships?
Answer:
fouling of ship
Biofouling, or the fouling of ships, refers to the undesirable accumulation of microorganisms, plants, algae, and small animals on submerged surfaces such as ship hulls, which increases drag and maintenance costs.
10
Which organism is most extensively utilized as a model system in the fields of molecular biology, genetics, and biochemistry?
Answer:
bacteria
Bacteria, particularly Escherichia coli, are the primary model organisms in molecular biology and genetics due to their rapid growth rates, simple nutritional requirements, and well-understood genome. Their ease of manipulation makes them ideal for studying fundamental biological processes like DNA replication, transcription, and protein synthesis.