Vernalisation prevents

(1) Precocious reproductive development late in growing season

(2) Late reproductive development

(3) Flowering

(4) Fruiting

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

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

Winter varieties should be planted in

Winter varieties resume their Growth in

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

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

If a plant needs exposure of light more than a well defined critical period for flowering, it would be called as-