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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: […]

22. Gibberellic acid activates alpha-amylase activity in (1) Endosperm        (2) Aleuronic layer (3) Cotyledons        (4) Embryo Correct answer: (2) Aleuronic (aleurone) layer The plant growth regulator gibberellic acid (GA) activates […]

21 .During germination of barley seeds, enzymes for mobilization of reserve material to developing embryo are secreted from (1) Endosperm        (2) Embryo (3) Aleurone layer   (4) Embryonic leaves Concept in […]

Gibberellic acid stimulates seed germination in monocots by activation of digestive enzymes by acting on (1) Endosperm            (2) Aleurone layer (3) Embryo                    (4) Cotyledons Correct answer: (2) Aleurone layer […]

Among the following which hormone can induce flowering in short day plants grown even under long duration of light (1) Gibberllic acid (2) Auxins (3) Cytokinin                 (4) Abscisic acid Correct […]

Which plant growth regulator is involved in activating alpha-amylase activity in germinating seeds? (1) Auxin                            (2) Cytokinin (3) Gibberlic acid           (4) Brassinosteroids Correct answer: (3) Gibberlic acid Gibberellins produced […]

Hydrolysis of stored proteins produced free amino acids which can be used for glucose biosynthesis. Phytohormone responsible for conversion of stored protein into glucose by activating in germinating cereals is- […]