| 21. | On plotting the growth in terms of time and size on the graph, an ‘S’ shaped curve is formed, which is called – |
A. sigmoid curve | |
B. respiratory curve | |
C. osmosis curve | |
D. emission curve |
| 22. | To increase the height of plants, it is not necessary – |
A. sodium | |
B. calcium | |
C. nitrogen | |
D. phosphorus |
| 23. | The growth movements of plants which are caused by light stimulation are called – |
A. geotropism | |
B. heliotropism | |
C. hydrotropism | |
D. thigmotropism |
| 24. | Plant movement induced by external stimuli is called – |
A. induced motion | |
B. autonomous motion | |
C. systole rate | |
D. systole speed |
| 25. | The movement of a mimosa leaf is – |
A. photoconstriction | |
B. tremor | |
C. target narrowing | |
D. hypertrophy |
| 26. | The leaves of the mimosa plant wither when touched, because – |
A. leaf tissue is injured | |
B. inflation pressure of petiole changes | |
C. plants have a nervous system | |
D. the leaves are very soft |
| 27. | The bending of the shoot while moving towards the sunlight is called – |
A. photoconstriction | |
B. scintillation | |
C. heliotropism | |
D. diversion |
| 28. | A good example is the wrapping of pea shoots around a base. |
A. tangential | |
B. nash momentum | |
C. chemotactic | |
D. Phototropic |
| 29. | In sundew and venus fly trap insectivorous plants, the movement is |
A. systolic motion | |
B. tympanic motion | |
C. strobe speed | |
D. None of these |
| 30. | Roots have positive geotropism – |
A. Always | |
B. majority of | |
C. sometimes | |
D. never |