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

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Solution

Roles of ethylene:

Ethylene is a gaseous phytohormone. It has both positive and negative effects.

Positive effect negative Negative effect

● Hastens to ripen of fruits.

● Breaks seed dormancy.

● Initiates germination.

● Helps in apical hook formation in dicot seedlings.

● Promotes root hair formation. ● Promotes senescence and abscission of leaves and flowers.

Roles of abscisic acid:

Abscisic acid is a stress hormone and acts as a growth inhibitor. It causes both positive and negative effects on plants.

Positive effect Negative effect

● Increases the tolerance of plants to various kinds of stresses. For example, by triggering stomatal closure.

● Induces seed dormancy and helps to withstand desiccation. ● Inhibits plant growth.

● Acts as an inhibitor of plant metabolism.

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Positive effect negative	Negative effect
● Hastens to ripen of fruits. ● Breaks seed dormancy. ● Initiates germination. ● Helps in apical hook formation in dicot seedlings. ● Promotes root hair formation.	● Promotes senescence and abscission of leaves and flowers.

Positive effect	Negative effect
● Increases the tolerance of plants to various kinds of stresses. For example, by triggering stomatal closure. ● Induces seed dormancy and helps to withstand desiccation.	● Inhibits plant growth. ● Acts as an inhibitor of plant metabolism.