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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 […]

The plant hormone, Gibberellic Acid is generally NOT associated with (1) stem elongation. (2) Parthenocarpy (3) parthenogenesis                  (4) malt production Correct answer: (3) Parthenogenesis Explanation: Gibberellic acid (GA) is widely […]

A farmer growing a particular variety of grape plants in vineyard, observes the following: (A)Fruit size normally remained small. (B) Natural seed abortion. (C) Development of fungal infection as the […]

28. Gibberellic acid (GA) controls seed germination by directing breakdown of the stored starch. In which one of the following tissues of the barley seed, alpha-amylase gene is induced in […]

Which one of the following statements regarding seed germination of a wild type plant is NOT correct? (1) Low ABA and high bioactive GA can break seed dormancy. (2) Light […]