MCQs Botany-15 Posted on 2024-07-122024-11-08Author admin 0 MCQs Botany-15 1. Which hormone is responsible for causing the closure of stomata? Ethylene Auxin Gibberellin Abscisic Acid 2. Which is a precursor to ethylene in plants? Sucrose Glucose Methionine Chlorophyll 3. ———– is the shallow zone of a lake or ocean where most aquatic plants grow Profundal zone Benthic zone Neritic zone Littoral zone 4. Grasses are more sensitive to _________ Freezing Alternate Freezing and Thawing Thawing 5. Which nitrogenous base is unique to RNA and not found in DNA? Adenine (A) Guanine (G) Uracil (U) Cytosine (C) 6. What is the main pigment involved in the transfer of electrons in photosynthesis? Carotenoids Phytochrome Cytochrome Chlorophyll c 7. Which of the following is needed in both photosynthesis and respiration? Cytochrome Sunlight Chlorophyll Glucose 8. Which statement is true about ethylene? Breaks apical dominance Used in long-term fruit storage Gaseous plant hormone Inhibits fruit ripening 9. What is a food chain? A network of organisms that consume each other All of these A group of organisms that coexist in an ecosystem A linear sequence of organisms that consume each other 10. Cytochromes are a group of biochemicals found in ——— Only in plants Only in bacteria Only in animals In almost all living cells Loading …
