Q. No.Which of the following induces morphogenesis in tissue culture:
1. Gibberellin
2. Cytokinin
3. IAA
4. Ethylene
1. Gibberellin
2. Cytokinin
3. IAA
4. Ethylene
Agent orange is:
| 1. | Biodegradable insecticide |
| 2. | Di auxin (2–4,D and 2, 4, 5 T) weedicide |
| 3. | Biofertilizer |
| 4. | Biopesticide |
Effect of light and dark rhythm on plants is known as:
1. Photonasty
2. Phototropism
3. Photoperiodism
4. Photomorphogenesis
Growth of leaf primordia is:
1. First apical then marginal
2. Only apical
3. Only marginal
4. Lateral
One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set, the night phase was interrupted by a flash of light and it did not produce a flower. Under which one of the following categories will you place this plant?
1. Darkness neutral
2. Day neutral
3. Short day
4. Long day
The maximum growth rate occurs in:
| 1. | Senescent phase |
| 2. | Lag phase |
| 3. | Exponential phase |
| 4. | Stationary phase |
Cell elongation in internodal regions of the green plants takes place due to:
| 1. | Cytokinins | 2. | Gibberellins |
| 3. | Ethylene | 4. | Indole acetic acid |
What is a phytotron:
| 1. | A device to grow the plants in a controlled environment |
| 2. | Growing plants in greenhouse |
| 3. | Radiation chamber to induce the mutations |
| 4. | Apparatus to study the effect of light on plants |
Exponential growth is shown by:
1. Unicellular forms
2. A cell in tissue culture
3. Embryo
4. Multicellular plants
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