Question

Pomalin is sprayed over apples to increase fruit size. It is
A) Auxin
B) Mixture of auxin and gibberellin
C) Mixture of auxin and cytokinin
D) Mixture of cytokinin and gibberellin

Answer 1

ust like human hormones, plant hormones are chemical substances which help the plant in its growth and also in tolerating environmental stress.

Complete answer:
As plants need water, oxygen, minerals, etc for their growth, they also need hormones. Plant hormones or phytohormones are required for regulating the development and growth of the plants.

Option A: The hormone auxin is used to promote growth in plants, but pomalin does not only contain auxin. Therefore, this is the incorrect option.

Option B: Pomalin is made up of auxins and gibberellins. The hormone auxin is used to promote growth in plants and gibberellins can enhance the cell enlargement, which leads to increasing size. Therefore, this is the correct option.

Option C: Pomalin contains auxin as it helps in increasing the fruit size. Cytokinin helps by influencing the cell division in the early stage of fruit development in cases of kiwi, persimmon, etc. But this hormone cannot be used in the case of apples. Therefore, this is the incorrect option.

Option D: Cytokinin helps by influencing the cell division in the early stage of fruit development in cases of kiwi, persimmon, etc. But this hormone cannot be used in case of apples.Pomalin contains gibberellins as it helps in increasing the fruit size. Therefore, this is the incorrect option.

Thus, the correct answer is option (B) Mixture of auxin and gibberellin.

Note: There are 5 types of plant hormones,
i) Auxin - It helps is cell elongation of roots and stems
ii) Ethylene - It helps in ripening of fruit
iii) Abscisic acid - It is a growth inhibiting hormone
iv) Gibberellins - It helps in inducing parthenocarpy
v) Cytokines - It helps in delaying of leaf senescence