Plant Growth & Development PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Biology · Plant Growth & Development · Set 1 (Q1-30)
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1. $Through their effect on plant growth regulators, what do the temperature and light control in the plants?$ (1) $Flowering$ (2) $Closure of stomata$ (3) $Fruit elongation$ (4) $Apical dominance$ 2. $Dr F. Went noted that if coleoptiles tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?$ (1) $It made possible the isolation and exact identification of auxin.$ (2) $It is the basis for quantitative determination of small amounts of growth promoting substances.$ (3) $It supports the hypothesis that IAA is auxin.$ (4) $It demonstrated polar movement of auxins.$ 3. $Which one of the following growth regulators is known as ‘stress hormone’?$ (1) $Abscisic acid$ (2) $Ethylene$ (3) $GA3$ (4) $Indole acetic acid$ 4. $Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in :-$ (1) $Annual plants$ (2) $Floral parts$ (3) $Vessels and tracheid differentiation$ (4) $Leaf abscission$ 5. $Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.$ (1) $Abscisic acid$ (2) $Cytokinin$ (3) $Gibberellin$ (4) $Ethylene$ 6. $The site of perception of light in plants during photoperiodism is$ (1) $Stem$ (2) $Axillary bud$ (3) $Leaf$ (4) $Shoot apex$ 7. $Plants follow different pathways in response to environment or phase of life to form different kinds of structures. This ability is called$ (1) $Flexibility$ (2) $Plasticity$ (3) $Maturity$ (4) $Elasticity$ 8. $One of the commonly used plant growth hormone in tea plantation is$ (1) $Ethylene$ (2) $Abscisic acid$ (3) $Zeatin$ (4) $Indole-3-acetic acid$ 9. $Photoperiodism was first characterized in$ (1) $Tobacco$ (2) $Potato$ (3) $Tomato$ (4) $Cotton$ 10. $Which one of the following generally acts as an antagonist to gibberellins?$ (1) $ABA$ (2) $IAA$ (3) $Zeatin$ (4) $Ethylene$ 11. $Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is experiment ?$ (1) $It made possible the isolation and exact identification of auxin.$ (2) $It is the basis for quantitative determination of small amounts of growth-promoting substances.$ (3) $It supports the hypothesis that IAA is auxin.$ (4) $It demonstrated polar movement of auxins.$ 12. $The phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as :$ (1) $Differentiation$ (2) $Dedifferentiation$ (3) $Redifferentiation$ (4) $Secondary growth$ 13. $During seed germination its stored food is mobilized by$ (1) $Ethylene$ (2) $Cytokinin$ (3) $ABA$ (4) $Gibberellin$ 14. $Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants:$ (1) $Gibberellin$ (2) $Ethylene$ (3) $Cytokinin$ (4) $ABA$ 15. $The ability of plants to follow different pathways in response to environment leading to formation of different kinds of structures is called :$ (1) $Redifferentiation$ (2) $Development$ (3) $Plasticity$ (4) $Differentiation$ 16. $Which hormone is used to induce immediate stomatal closure in leaves?$ (1) $Gibberellin$ (2) $Abscisic Acid$ (3) $Auxin$ (4) $Cytokinin$ 17. $Phototropic curvature is the result of uneven distribution of :$ (1) $Gibberellin$ (2) $Phytochrome$ (3) $Cytokinins$ (4) $Auxin$ 18. $Which one of the following plants does not show plasticity?$ (1) $Maize$ (2) $Cotton$ (3) $Coriander$ (4) $Buttercup$ 19. $Spraying of which of the following phytohormone on juvenile conifers helps in hastening the maturity period, that leads to early seed production?$ (1) $Abscisic Acid$ (2) $Indole-3-butyric Acid$ (3) $Gibberellic Acid$ (4) $Zeatin$ 20. $Parthenocarpic tomato fruits can be produced by?$ (1) $raising the plants from vernalized seeds$ (2) $treating the plants with phenylmercuric acetate$ (3) $removing androecium of flowers before pollen grains are released$ (4) $treating the plants with low concentrations of gibberellic acid and auxins$ 21. $The plant hormone used to destroy weeds in a field is$ (1) $NAA$ (2) $2, 4 - D$ (3) $IBA$ (4) $IAA$ 22. $You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?$ (1) $Auxin and abscisic acid$ (2) $Gibberellin and abscisic acid$ (3) $IAA and gibberellin$ (4) $Auxin and cytokinin$ 23. $Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to$ (1) $Nitrate$ (2) $Ascorbic acid$ (3) $Chilling conditions$ (4) $Gibberellic acid$ 24. $The living differentiated cells, that lost the capacity to divide anymore, can regain the capacity of division under certain conditions. This phenomenon is termed as :$ (1) $Maturation$ (2) $Differentiation$ (3) $Dedifferentiation$ (4) $Redifferentiation$ 25. $The process of growth is maximum during :$ (1) $Dormancy$ (2) $Log phase$ (3) $Lag phase$ (4) $Senescence$ 26. $The gaseous plant growth regulator is used in plants to :$ (1) $promote root growth and root hair formation to increase the absorption surface$ (2) $help overcome apical dominance$ (3) $kill dicotyledonous weeds in the fields$ (4) $speed up the malting process$ 27. $Which of the following is not an inhibitory substance governing seed dormancy?$ (1) $Para-ascorbic acid$ (2) $Gibberellic acid$ (3) $Abscisic acid$ (4) $Phenolic acid$ 28. $An enzyme that can stimulate germination of barley seeds is$ (1) $Protease$ (2) $Invertase$ (3) $α amylase$ (4) $Lipase$ 29. $Removal of shoot tips is a very useful technique to boost the production of tealeaves. This is because:-$ (1) $Gibberellins prevent bolting and are inactivated$ (2) $Auxins prevent leaf drop at early stages$ (3) $Effect of auxins is removed and growth of lateral buds is enhanced.$ (4) $Gibberellins delay senescence of leaves.$ 30. $Which one of the following pairs, is not correctly matched?$ (1) $IAA - Cell wall elongation$ (2) $Abscisic acid - Stomatal closure$ (3) $Gibberellic acid - Leaf fall$ (4) $Cytokinin - Cell division$