Ethylene is a gaseous plant hormone which plays an important role in fruit ripening. In the presence of ethylene there is an increase in the rate of respiration.

Correct Option: C

Ethylene is a gaseous plant hormone which plays an important role in fruit ripening. In the presence of ethylene there is an increase in the rate of respiration.

Auxins are synthesized at the tip of shoot & then transported towards the base i.e. basipetal. In all segments of root at all temperatures, the movement of auxin is polarised acropetally.

Correct Option: D

Auxins are synthesized at the tip of shoot & then transported towards the base i.e. basipetal. In all segments of root at all temperatures, the movement of auxin is polarised acropetally.

Three types of growth are present in multicellular animals :
(i) Auxetic growth : Increase in cell volume only, not in number.
(ii) Multiplication growth : Increase in number, not in volume.
(iii) Accretionary growth : Growth is due to mitotic division of some special type of cells occurring in specific locations of body.

Correct Option: A

Three types of growth are present in multicellular animals :
(i) Auxetic growth : Increase in cell volume only, not in number.
(ii) Multiplication growth : Increase in number, not in volume.
(iii) Accretionary growth : Growth is due to mitotic division of some special type of cells occurring in specific locations of body.

Abscisic Acid (ABA) is called stress hormone which works in adverse environmental condition when there is low water content in the atmosphere or in drought conditions. ABA causes the stomatal closure of leaves due to which the water loss by the plant is minimized.

Correct Option: D

Abscisic Acid (ABA) is called stress hormone which works in adverse environmental condition when there is low water content in the atmosphere or in drought conditions. ABA causes the stomatal closure of leaves due to which the water loss by the plant is minimized.

Cytokinins help in retaining chlorophyll, hence delay senescense.

Correct Option: A

Cytokinins help in retaining chlorophyll, hence delay senescense.