Question

For tea plantations, and hedge-making, which of the following plant growth hormones is used ?

• A. Zeatin
• B. Indole-3 acetic acid
• C. Abscisic acid
• D. Ethylene

Answer 1

The correct option is B

Indole-3 acetic acid

The correct option is B.

Explanation of correct option:

1. Indole-3-acetic acid (IAA) is an example of the growth-inducing hormones known as Auxins.
2. Auxins such as IAA induce cell growth and tissue differentiation.
3. It also induces apical dominance, i.e., it helps in the growth of apical buds and also inhibits the growth of lateral buds.
4. It induces an increase in the vertical height of the plant.

Explanations of incorrect options:

Option A:

1. Zeatin is a cytokinin, that helps in the growth of lateral buds, cell growth, and cell differentiation of lateral meristem.
2. It also helps in leaf senescence.

Option C:

1. Abscisic acid(ABA) is a phytohormone that induces seed and dormancy in plants.
2. It also helps in controlling water retention via closing the stomatal aperture in the guard cells.

Option D:

1. Ethylene is a gaseous plant hormone that primarily focuses on the abscission of plants and the development of floral parts.
2. It induces the ripening of fruits in plants.

Final answer: For tea plantations, and hedge-making, the plant growth hormone indole-3 acetic acid is used.