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