CBSE Class 11 Biology Plant Growth and Development Assignments

Ques. A plant hormone used for inducing morphogenesis in plant tissue culture is
(a) cytokinins (b) ethylene
(c) abscisic acid (d) gibberellins. 

Answer: A

Ques. Which combination of gases is suitable for fruit ripening?
(a) 80% CH4 and 20% CO2
(b) 80% CO2 and 20% O2
(c) 80% C2H4 and 20% CO2
(d) 80% CO2 and 20% CH2

Answer: C

Ques. Which one among the following chemicals is used for causing defoliation of forest trees?
(a) Malic hydrazide (b) 2, 4-D
(c) Amo-1618 (d) Phosphon D

Answer: B

Ques. Gibberellic acid induces flowering
(a) in short day plants under long day conditions
(b) in day-neutral plants under dark conditions
(c) in some gymnospermic plants only
(d) in long day plants under short day conditions.

Answer: D

Ques. The movement of auxin is largely
(a) centripetal (b) basipetal
(c) acropetal (d) both (a) and (c).

Answer: B

Ques. If the growing plant is decapitated, then
(a) its growth stops
(b) leaves become yellow and fall down
(c) axillary buds are inactivated
(d) axillary buds are activated. 

Answer: D

Ques. 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. 

Answer: D

Ques. The regulator which retards ageing/senescence of plant parts is
(a) cytokinin (b) auxin
(c) gibberellin (d) abscisic acid. 

Answer: A

Ques. The hormone produced during adverse environmental conditions is
(a) benzyl aminopurine
(b) bichlorophenoxy acetic acid
(c) ethylene
(d) abscisic acid. 

Answer: D

Ques. Klinostat is employed in the study of
(a) osmosis
(b) growth movements
(c) photosynthesis
(d) respiration. 

Answer: B

Ques. Which is produced during water stress that brings stomatal closure?
(a) Ethylene
(b) Abscisic acid
(c) Ferulic acid
(d) Coumarin 

Answer: B

Ques. Bananas can be prevented from over-ripening by
(a) maintaining them at room temperature
(b) refrigeration
(c) dipping in ascorbic acid solution
(d) storing in a freezer. 

Answer: C

Ques. Apical dominance is caused by
(a) abscisic acid in lateral bud
(b) cytokinin in leaf tip
(c) gibberellin in lateral buds
(d) auxin in shoot tip.

Answer: D

Ques. Cytokinins
(a) promote abscission
(b) influence water movement
(c) help retain chlorophyll
(d) inhibit protoplasmic streaming. 

Answer: C

Ques. Which is employed for artificial ripening of banana fruits?
(a) Auxin (b) Coumarin
(c) Ethylene (d) Cytokinin 

Answer: C

Ques. Abscisic acid causes
(a) stomatal closure (b) stem elongation
(c) leaf expansion (d) root elongation.

Answer: A

Ques. The hormone responsible for apical dominance is
(a) IAA (b) GA
(c) ABA (d) Florigen. 

Answer: A

Ques. Hormone primarily connected with cell division is
(a) IAA (b) NAA
(c) cytokinin/zeatin (d) gibberellic acid.

Answer: C