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
If the apical bud has been removed then we observe:
1. More lateral branches
2. More axillary buds
3. Plant growth stops
4. Flowering stops
Which hormone is responsible for fruit ripening:
1. Ethylene
2. Auxin
3. Ethyl chloride
4. Cytokinin
Geocarpic fruits are:
1. Carrot
2. Radish
3. Ground nut
4. Turnip