| 31. | The plant hormone that helps in cell division is – |
A. abscisic acid | |
B. zeberlein | |
C. cytokinin | |
D. auxin |
| 32. | Which one of the following plant hormones keeps seeds in dormancy and plays a major role in defoliation? |
A. auskin | |
B. gibberellin | |
C. cytokinin | |
D. abscisic acid |
| 33. | Which of the following is a natural fruit ripening hormone? |
A. kinetin | |
B. gibberellin | |
C. auxin | |
D. ethylene |
| 34. | What is the post-photon movement controlled by? |
A. ethylene | |
B. auxin | |
C. gibberellin | |
D. cytokinin |
| 35. | Plant growth hormones gibberellins are extracted from? |
A. fungus | |
B. bacteria | |
C. Algae | |
D. none of the above |
| 36. | Which of the following is a weed killer? |
A. NAA | |
B. 2,4-D | |
C. ABA | |
D. GA |
| 37. | Which Indian scientist’s name is associated with plant growth titration? |
A. H. G. Khurana | |
B. C. V. Raman | |
C. J. C. Bose | |
D. Meghnath Saha |
| 38. | Which of the following tree requires maximum amount of water for its growth? |
A. Common | |
B. acacia | |
C. guava | |
D. Eucalyptus |
| 39. | Uses of Oxenometer- |
A. measuring the rate of photosynthesis | |
B. measuring growth | |
C. to measure the rate of sorption | |
D. to measure the rate of energy loss |
| 40. | Plants grow – |
A. for life | |
B. only for a certain period of time | |
C. intermittently throughout life | |
D. plants don’t grow |