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Which of the following is the plant hormone involved in seed and bud dormancy and in response of plants to stress? (1) Abscisic acid              (2) Cytokinin (3) Auxins                      […]

Plants make several hormones that are important for growth and development. Some statements on plant hormones are given below: A. Auxin is produced primarily in the root apices B.Cytokinins are […]

S-adenosyl methionine is a precursor of which plant hormone? (1) Absiccic acid                (2) Auxin (3) Ethylene                     (4) Cytokinin Correct answer: (3) Ethylene Explanation: S-adenosyl methionine (SAM) is a […]

Aspirin delays senescence in cut parts of plant and keeps flower fresh for longer time The effect of aspirin (1) by decreasing the synthesis of ethylene. (2) by increasing the […]

36. For which one of the plant hormone biosynthetic pathways, 1-aminocyclo- propane- 1 -carboxylic acid is an intermediate? (1) Abscisic acid            (2) Brassinosteroid (3) Ethylene                    (4) Gibberellic acid […]

35. The hormone responsible for leaf epinasty(curvature) in flooding-sensitive plants such as tomato is (1) abscisic acid                                 (2) auxin (3) ethylene                                  (4) gibbrellic acid Correct answer: (3) Ethylene […]

34. Plant hormone responsible fruit ripening is (1) Auxin                                   (2) Gibberellic acid (3) Abscisic acid                         (4) Ethylene Correct answer: (4) Ethylene Explanation: Ethylene is the primary plant hormone […]

33. Following statements were made regarding gibberellins (GA) biosynthesis in plants and fungi. (A) Two separate enzymes are involved in synthesis of ent-kaurene from GGDP in plants (B) Only a […]

32. The plant hormone gibberellins (GA) are a group of (1) Monoterpenes (C10)    (2) Diterpenes (C20), (3) Triterpenes (C30)                 (4) Sequiterpenes (C15) Correct answer: (2) Diterpenes (C20) Explanation: Gibberellins […]

Out of several gibberllins identified in plants, which one of the following is NOT bioactive (1) GA1           (2) GA3 (3) GA4           (4) GA5 Correct answer: (4) GA5 Explanation: Among […]