The role of ethylene and abscisic acid is both positive and negative.

Question:

The role of ethylene and abscisic acid is both positive and negative. Justify the statement.

Positive Roles of Ethylene :

Negative Role of Ethylene :

Positive Role of Abscisic acid:

Negative Role of Abscisic acid:

Solution:

(a) Positive Roles of Ethylene: Ripening of fruits

– When present in low concentration, it stimulates root meristem formation and promotes the growth of lateral roots.

(b) Negative Role of Ethylene:

– Ethylene is responsible for nullifying geotropism.

(c) Positive Role of Abscisic acid:

– During stress conditions, abscisic acid concentration increases in the leaves of the plant due to which stomata close preventing water loss via transpiration.

(d) Negative Role of Abscisic acid:

– It inhibits the growth of a plant and in turn, induces dormancy of buds.

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