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:

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