Which of the following is a stress hormone in plants?

(1) ABA

(2) GA3

(3) Cytokinin

(4) Auxins

(1) Seed development

(2) Maturation and dormancy

(3) Helps seeds to withstand desiccation and other factors unfavorable for growth

(4) Antagonist to Cytokinin

(1) Dormancy in seeds or buds

(2) Abscission, Apical Dominance

(3) Senescence

(4) Fruit Ripening

(1) PGR is of only one kind of intrinsic control

(2) Only under genomic control, these PGRs play an important role in plant growth and development

(3) Many of the extrinsic factors such as temperature and light control plant growth and development via PGR

(4) Vernalization, Flowering, dormancy, seed germination and plant movements are under the control of extrinsic factors along with intrinsic factors

(1) Periodic exposure to light

(2) Continuous exposure to light

(3) No exposure to light

(4) No exposure to night

(1) Long day plants

(2) Short day plants

(3) Day neutral plants

(4) Red light plants

(1) Long day plants

(2) Short day plants

(3) Day neutral plants

(4) Far red light plants

1. Only duration of dark period is important

2. Certain plants depend not only on a combination of light and dark exposures but also their relative durations

3. The site of perception for light or dark duration are the leaves

4. There is a hormonal substance which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.

(1) by quantitative exposure to low temperature

(2) by qualitative exposure to low temperature

(3) Both A and B

(4) It does not depend on low temperature exposure

(1) Precocious reproductive development late in growing season

(2) Late reproductive development

(3) Flowering

(4) Fruiting