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
By which action a seed coat becomes permeable to water:
1. Scarification
2. Stratification
3. Vernalization
4. All of the above
Which of the following PGR is present in coconut milk which is used in tissue culture?
1. Cytokinin
2. Auxin
3. Gibberellin
4. Ethylene