Category: CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

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 […]

The dwarf pea mutant (le) used by Mendel was defective in which of the following enzyme involved in gibberellin biosynthesis? (1) ent-Kaurene synthase. (2) GA 3 beeta-hydroxylase. (3) GA 20-oxidase. […]

25. Which plant hormones signal transduction pathway includes genes ‘rht, ‘spy’, ‘gai’? (1) Auxin                (2) Gibberlicacid (3) Abscisic acid      (4) Ethylene Correct answer: (2) Gibberellic acid Explanation: The genes rht, spy, […]

24 During germination of seeds, after imbibition of water first step would be (1) Mobilization of reserve food (2) Transcription of specific genes (3) Cell division (4)  Embryo differentiation Correct […]

23. Among the following which is not involved in plant defense signaling pathway (1) Gibberellic acid  (2) Ethylene (3) Salicylic acid      (4) Jasmonic acid Correct answer: (1) Gibberellic acid. Explanation: […]