Root development is promoted by:
1. Auxin
2. Gibberellin
3. Ethylene
4. Abscisic acid
One of the commonly used plant growth hormone in tea plantations is:
1. | Abscisic acid | 2. | Zeatin |
3. | Indole-3- acetic acid | 4. | Ethylene |
Which one of the following generally acts as an antagonist to Gibberellins?
1. Ethylene
2. ABA
3. IAA
4. Zeatin
Vernalisation stimulates flowering in:
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand
What is necessary for ripening of fruits:
1. 80% of ethylene
2. Abscisic acid
3. 2, 4 D
4. A.M.O. – 16
Effect of light and dark rhythm on plants is known as:
1. Photonasty
2. Phototropism
3. Photoperiodism
4. Photomorphogenesis
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 |
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