NEET Botany Plant Growth and Development MCQs

Which plant hormone is commonly used to prevent the early abscission of fruits and leaves?

Which gaseous phytohormone is involved in abscission of leaves and flowers?

Among the following features of ethylene, how many are antagonistic to abscisic acid?

a) Horizontal growth of seedlings b)Promotes abscission of plant organs

c) Effective in fruit ripening d) Breaking seed and bud dormancy

e) Initiates germination in some seeds

The shedding of leaves, flowers or fruits due to change in the hormonal balance in plants, is referred as

The shedding of leaves, flowers or fruits due to change in the hormonal balance in plants, is referred as

I. Antagonist to GA

II. Promoted bud dormancy

III. Promoted stomatal closure

IV. Promoted abscission layer

Identify the hormone/s which promote/s all these events in plants and choose the correct option

Senescence as an active developmental cellular process in the growth and functioning of a flowering plant, is indicated in

Choose the correct statement

I. Cytokinin – Delay of leaf senescene

II. Auxin – Apical dominance

III. Ethylene – Seed germination

IV. Gibberellins – Immature falling of leaves

Pick out the correct statements.

i. Cytokinins especially help in delaying senescence.

ii. Auxins are involved in regulating apical dominance.

iii. Ethylene is especially useful in enhancing seed germination.

iv. Gibberellins are responsible for immature falling of leaves.

Abscission and dormancy are caused by