The most widely used compound as source of Ethylene is

(1) Ethephon

(2) Etiope

(3) Ethyl Methyl carbon

(4) Epitope

(1) In an aqueous solution, it is readily absorbed and transported within the plant and release ethylene slowly

(2) Hastens fruit ripening in tomatoes and apples

(3) Accelerates abscission in flowers and fruits

(4) Promotes male flowers in cucumbers thereby increasing the yield

(1) Thinning Cotton, Cherry and Walnut

(2) Promotes female flowers in cucumber

(3) Hastens the fruit ripening in tomatoes and apples

(4) All of these

(1) Acts as general plant growth inhibitor and an inhibitor of plant metabolism

(2) Inhibits seed germination

(3) Stimulates the opening of stomata in the epidermis

(4) Increases the tolerance of plants to various kinds of stresses

(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