One of the commonly used plant growth hormone in tea plantations is:
1. | Abscisic acid | 2. | Zeatin |
3. | Indole-3- acetic acid | 4. | Ethylene |
Root development is promoted by:
1. Auxin
2. Gibberellin
3. Ethylene
4. Abscisic acid
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