Question

Auxin define this term

Answer 1

Auxin is a plant hormone or phytohormone that promotes growth in plants.
It is responsible for promoting cell enlargement and differentiation.
It also promotes stem and root growth.
It induces parthenocarpy too.

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Answer 2

Auxins are the plant hormones which promote cell enlargement and cell differentiation. 
Auxins also promote fruit growth. 
Auxin hormone is responsible for phototropic and geotropic responses of plants.