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

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

CSIR NET Life Science Previous Year Questions and Solution Plant Hormones Plant Hormones

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 response to GA? (1) Endosperm (2) Coleoptile (3) Aleurone layer (4) Embryo

Alpha-Amylase Gene Induction

27. 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 accompanied with high temperature can break seed dormancy. (3) GA induces synthesis of hydrolytic enzymes in cereal grains (4) Degradation of carbohydrates and storage proteins provide nourishment and energy to support seedling growth.

Seed Germination in Wild Type Plants

26. 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. (4) ent-Kaurenoic acid hydroxylase.

Mendel’s Dwarf Pea Mutant and Defect in Gibberellin 3 Beta-Hydroxylase Enzyme

25. Which plant hormones signal transduction pathway includes genes 'rht, 'spy', 'gai'? (1) Auxin (2) Gibberlicacid (3) Abscisic acid (4) Ethylene

Plant Hormone Signal Transduction Pathway Genes

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

Activation of Gene Transcription

23. Among the following which is not involved in plant defense signaling pathway (1) Gibberellic acid (2) Ethylene (3) Salicylic acid (4) Jasmonic acid

Plant Defense Signaling Pathways

22. Gibberellic acid activates alpha-amylase activity in (1) Endosperm (2) Aleuronic layer (3) Cotyledons (4) Embryo

Plant growth regulator Gibberellic acid

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

Enzyme-Secreting Tissue in Germinating Barley Seeds

20. Gibberellic acid stimulates seed germination in monocots by activation of digestive enzymes by acting on (1) Endosperm (2) Aleurone layer (3) Embryo (4) Cotyledons

Gibberellic Acid Action on the Aleurone Layer During Monocot Seed Germination

19. 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

Gibberellic Acid-Induced Flowering in Short Day Plants

18. Which plant growth regulator is involved in activating alpha-amylase activity in germinating seeds? (1) Auxin (2) Cytokinin (3) Gibberlic acid (4) Brassinosteroids

Regulator is involved in activating alpha-amylase activity

17. 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- (1) Cytokinin (2) Auxin (3) Gibberellin (4) Abscissic Acid

Gibberellin-Controlled Protein Mobilization

16. The dwarfing gene which was responsible for green revolution is involved in signaling of which plant hormone? (1) Gibberlic acid (2) Cytokinin (3) Absicic acid (4) Ethylene

Gibberellin Signaling in Semi-Dwarf Crops

15. Mobilization of starch by alpha amylase activity is induced by (1) Auxin (2) Cytokinin (3) Gibberellic acid (4) Ethylene

Gibberellic Acid-Induced α-Amylase Activity

14. Which one of the following statements related to components/features of senescence in plants is INCORRECT? (1) Programmed cell death in plants may generate functional cells or tissues. (2) Senescence can be induced by application of cytokinins and delayed by overexpression of salicylic acid. (3) Plants defective in autophagy demonstrate accelerated plant senescence. (4) Leaf senescence is regulated by NAC and WRKY gene families.

Key Regulatory Components of Plant Leaf Senescence and Programmed Cell Death

13. Transgenic tobacco plants over-expressing isopentenyl transferase (IPT) under the control of promoter region of Senescence Associated Receptor kinase (P SARK) were exposed to drought for 15 days followed by re-watering for 7 days. The following hypotheses were proposed regarding changes in the transgenic plants at the end of 7 days of re-watering: A. The plants would be wilted and fail to survive, B. The plants would be healthy and survive. C. The plants would show higher production of cytokinin compared to wild type plants. D. The plants would show higher production of absicic acid compared to wild type plants. Which one of the following combinations of the above hypotheses is correct? (1)A and C (2) A and D (3) B and C (4) B and D

PSARK::IPT Transgenic Tobacco

12. Agrobacterium tumefacienscauses crown gall diseases in dicot plants. Which phytohormone genes are present of T-DNA? (1) Auxin and cytokinin (2) Auxin only (3) Cytokinin only (4) Cytokinin and Gibberellic acid

Phytohormone Genes Carried on Agrobacterium tumefaciens

11. Gibberllin treatment to grape plants leads to (1) Fruit ripening (2) Seedless fruit (3) Cell division (4) Leaf fall

Effect of Gibberellin Treatment on Grape Plant

10. A transgenic lettuce plant was generated by over expressing isopentenyl transferase (IPT) gene under the control of the promoter of senescence activator gene (SAG12). Following are some statements regarding this transgenic plant. The transgenic plants A. exhibit delayed senescence. B. exhibit fast senescence. C. have higher amount of cytokinin during senescence. D. have higher amount of gibberellins during senescence. Which one of the following combinations of above statements is correct? (1) A and B (2) A and C (3) B and D (4) C and D

Senescence-Activated SAG12

9. Which one of the following statements is correct for the transport of cytokinin in plants? (1) It takes place only from root to shoot. (2) it takes place only from shoot to root (3) Root and shoot make their own cytqk,n, therefore. no transport is required. (4) Transport can occur from root to shoot and vice versa.

Direction of Cytokinin Transport in Plants

8. The plant hormones, auxins and cytokinins, and their interactions play an important role in regulating apical dominance_ The following figure represents a" experiment related to the study of gene interactions that influence axillary bud outgrowth or dormancy. Q,Z and M represent genes involved Phytohorrnone pathway. Based on the above figure, the following statements were made: A. 'X' is an auxin that maintains expression of 'Q' and 'Z' and represses 'M'. B. 'Y' is a cytokinin that promotes axillary bud growth and is induced by 'M'. C Decapitation (removal of apex) activates} D. 'X' is a cytokinin that represses 'M'. 'X' Which one of the following options represents correct staternent(s)? (1) A and C only (2) B and D only (3) A and B only (4) C only

Auxin–Cytokinin Interactions in Apical Dominance and Axillary Bud Outgrowth

7. The following statements are made regarding cytokinin (CE) biosynthesis plants: A.Trans-zeatin (tZ) and iso-pentenyladenile (iP) are common active forms of isoprenoid CKs. B. CKs are present as nucleoside and glycosidic conjugates but not as nucleotide conjugates. C. Dephosphorylation and deribosylation Steps are involved in two-step pathway for active CK formation. D. Lonely Guy (LOG) enzyme , involved in CK metabolism Which one of the following options represents the combination of all correct statements? (1)A, B and C (2) A, Band D (3) A, C and D(4) B, C and D

Cytokinin Biosynthesis Plants

6.Cytokinin synthesis is maximum in (1) Roots (2) Leaves (3) Shoots tip (4) Fruits

Cytokinin synthesis

5. A young dicot seedling (e.gsoyabean) is subjected tc gravity stimulus by laying it horizontally on a surface the shoot bends upwards and root bends downward. Indicate the reason. (1) Redistribution of auxin throughout the seedlings is responsible for stimulatory unequal growth in shoots and roots. (2) Redistribution of auxin in shoots while cytokinine in roots is responsible for stimulatory unequal growth. (3) Redistribution of auxin in roots while cytokinine in shoot is responsible for stimulatory unequal growth. (4) Redistribution of cytokinine throughout the seedlings is responsible for stimulatory unequal growth in shoots and roots.

Auxin Redistribution and Gravitropic Bending in Young Dicot Seedlings

4. The plant hormone indole-3-acetic acid (I.) is ores,: in most plants. The structure of this hormone is related to which one of the following amino acids? (1) Glutamic acid (2) Aspartic acid (3) lysine (4) Tryptophan

Indole-3-Acetic Acid Structure

3. Bending of Oat coleoptiles tip toward source of unilateral light of wavelength 454 is due to (1) lateral distribution of auxin toward shaded area (2) Polar transport of auxin (3) Degradation of auxin toward light (4) Synthesis of auxin in shaded area

Lateral Auxin Redistribution and Phototropic Bending in Oat Coleoptiles

2. A tryptophan auxotroph in corn showed 50 times more accumulation of IAA then the normal. Probable explanation for this is (1) There exist another tryptophan independent pathway for IAA synthesis (2) IAA is probably inhibited by feedback mechanism (3) IAA was not oxidized (4) Deconjugation of ester linked IAA does not take place

Tryptophan Auxotroph in Corn

1. In plants IAA causes cell elongation due to - (1) Increase in pH of Apoplast (2) Increase in pH of cytoplasm (3) Decrease in pH of Apoplast (4) Increase in pH of cytoplasm

IAA causes cell elongation

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