Match the following concerning the activity/function and the phytohormone involved:

	Column I		Column II
(a)	Fruit ripener	(i)	Abscisic acid
(b)	Herbicide	(ii)	GA 3
(c)	Bolting agent	(iii)	2, 4-D
(d)	Stress hormone	(iv)	Ethephon

Select the correct option from following:

Options:	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(iv)	(i)
2.	(iii)	(iv)	(ii)	(i)
3.	(iv)	(iii)	(ii)	(i)
4.	(iv)	(ii)	(i)	(iii)

Vernalisation stimulates flowering in:
1. Turmeric
2. Carrot
3. Ginger
4. Zaminkand

Which one of the following generally acts as an antagonist to Gibberellins?
1. Ethylene
2. ABA
3. IAA
4. Zeatin

One of the commonly used plant growth hormone in tea plantations is:

Root development is promoted by:
1. Auxin
2. Gibberellin
3. Ethylene
4. Abscisic acid

Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to:
1. Gibberellic acid
2. Nitrate
3. Ascorbic acid
4. Chilling conditions

Who coined the term 'Kinetin'?

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