The phytohormone, which was first isolated from human urine, shows

a.	Bolting effect.
b.	Apical dominance.
c.	Control of xylem differentiation.
d.	Promote leaf senescence.
e.	Ripening of fruit.
f.	Initiation of rooting is stem cuttings.

 

1.	b, c and f
2.	a, d and e
3.	b, e and f
4.	a, b and d

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1. IAA and gibberellin

2. Auxin and cytokinin

3. Auxin and abscisic acid

4. Gibberellin & abscisic acid

Winter varieties resume their Growth in

Winter varieties should be planted in

The spring varieties are normally planted in…...and come to flower and produce grain……

Which of the following does not has two kinds of varieties?

Vernalisation prevents

Flowering can be affected in certain plants

When there is no such relation between exposure to light duration and induction of flowering response such plants are called

If a plant needs exposure of light less than a defined period for flowering, such plant is called