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Botany MCQS[NEET-2021 to 2022]-Plant harmones

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1. The term auxin was coined by




2. Precursor of Indole acetic acid (natural auxin) is




3. All the following hormones are growth inhibitors except




4. Which of the following is a gaseous hormone




5. Which of the following is widely used as a rooting hormone




6. Agent orange the leaf defoliator used by USA in Vietnam war was




7. All the following inhibits auxin transport (anti-auxins) except




8. Which of the following auxin is widely used as a selective weedicide




9. All are synthetic auxins except




10. Auxin transport is




11. Which of the following bioassays are used to detect the presence of auxin




12. Which of the following is not a function of auxin




13. Nodule formation is induced by




14. All are natural auxins except




15. Which of the following is an auxin receptor




16. Cytokinins are




17. Which of the following is a natural cytokinin




18. The first kinetin isolated by Miller was from




19. The first natural cytokinin isolated from liquid endosperm was




20. Agrobacterium tumefaciens Ti plasmids t-DNA has genes for




21. Plant hormone which is responsible for saving the crops from falling




22. The plant hormone which is found in gaseous form




23. Plant hormone which is responsible for the ripening of fruits




24. Name the plant hormone which is helpful in making RNA and protein?




25. Which of the following statement is incorrect ?




26. Name the plant hormone which is help in breaking the dormancy of plant?




27. The plant hormone which is formed in leaves and helps in the blooming of the flowers




28. Name the plant hormone which is formed in injured cells for healing of damage part ?




29. Plant hormone which is help in the cell division and development in the presence of auxins




30. Which of the plant hormone increases the activity of cambium in the wooden plants?




31. Coconut milk factor is




32. Synthetic auxin is




33. The enzyme which is stimulate germination of barley seeds is




34. Seed dormancy is due to the




35. Importance of day length in flowering of plants was first shown in




36. Phototropic curvature is the result of uneven distribution of




37. Coiling of garden pea tendrils around any support is an example of




38. Natural cytokinins are synthesized in tissues that are




39. Gaseous plant hormone is




40. Differentiation of shoot is controlled by




41. Opening of floral buds into flowers, is a type of




42. The annular and spirally thickened conducting elements generally developed in the protoxylem when the root or stem is




43. Acids which is a derivative of carotenoids




44. Cell elongation in internodal regions of the green plants takes place due to




45. Which one of the following pairs, is correctly matched




46. Plant hormone which is responsible for environmental stress and dormancy is




47. Auxin is produced in




48. Stem elongation is controlled through




49. Amyloplasts are




50. Gibberellins are produced commercially from




51. Antagonistic to gibberellins, flowering is promoted in short day plants by




52. Gibberelins sometimes substitute for




53. Weed killing is done by




54. Bud initiation in shoots in promoted by




55. Bolting of some rosette plants is promoted by




56. IAA is




57. Sprouting of potatoes is inhibited by




58. Gibberellins was named after a fungus known as




59. The most studied gibberellin is




60. All are anti giberrellins except