Plant Growth and Development Questions — NEET Biology

Q1

During seed germination, stored food is mobilized by

A Cytokinin

B ABA

C Gibberellin

D Ethylene

Correct Answer

Option C

Solution

(c) Gibberellins stimulate alpha-amylase synthesis to mobilize starch reserves.

Q2

What is the site of perception of photoperiod necessary for induction of flowering in plants?

A Lateral buds

B Pulvinus

C Shoot apex

D Leaves

Correct Answer

Option D

Solution

(d) Leaves perceive photoperiodic stimulus for flowering induction.

Q3

Klinostat is employed in the study of

A osmosis

B growth movements

C photosynthesis

D respiration

Correct Answer

Option B

Solution

(b) Klinostat (clinostat) nullifies geotropism to study growth movements.

Q4

Thigmotropic movement is best shown by

A movement in tendril

B insectivorous plants

C movement in roots

D movement in Mimosa pudica

Correct Answer

Option A

Solution

(a) Tendrils coiling around support show the best example of thigmotropism.

Q5

A plant hormone used for inducing morphogenesis in plant tissue culture is

A gibberellins

B cytokinins

C ethylene

D abscisic acid

Correct Answer

Option B

Solution

(b) Cytokinins induce shoot morphogenesis in tissue culture.

Q6

Which combination of gases is suitable for fruit ripening?

A 80% CO2 and 20% CH2

B 80% CH4 and 20% CO2

C 80% CO2 and 20% O2

D 80% C2H4 and 20% CO2

Correct Answer

Option D

Solution

(d) Ethylene (C2H4) promotes fruit ripening; CO2 reduces its rate.

Q7

ABA is involved in

A dormancy of seeds

B root elongation

C shoot elongation

D increased cell division

Correct Answer

Option A

Solution

(a) ABA promotes seed dormancy and inhibits germination.

Q8

Which is employed for artificial ripening of banana fruits?

A Auxin

B Coumarin

C Ethylene

D Cytokinin

Correct Answer

Option C

Solution

(c) Ethylene (acetylene gas) is used commercially for artificial fruit ripening.

Q9

Removal of apical bud results in

A formation of new apical bud

B elongation of main stem

C death of plant

D formation of lateral branching

Correct Answer

Option D

Solution

(d) Removing apical bud releases lateral buds from apical dominance.

Q10

Which of the following prevents fall of fruits?

A GA3

B NAA

C Ethylene

D Zeatin

Correct Answer

Option B

Solution

(b) NAA (synthetic auxin) prevents premature fruit drop, especially in tomato.