12th Biology Important Questions Tamil Medium

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12th Biology Important Questions Tamil Medium. We covered all the 12th Biology Important Questions Tamil Medium MCQs in this post for free so that you can practice well for the exam.

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12th Biology Important Objective Questions Tamil Medium for Students
IAA was first isolated from:
The gas used for artificial ripening of green fruit is:
Which of the following phytohormones is mainly responsible for fruit ripening?
Abscisic acid is also known as a stress hormone because:
The hormone related to drought tolerance is:
Which hormone is found in the gaseous form?
Which one among the following hormones stimulates the plant cells to grow in a manner such that the plants bend towards light?
To increase sugar production in sugarcanes, they are sprayed with

12th Biology Important Objective Questions Tamil Medium for Students

IAA was first isolated from:

(a) Corn germ oil

(b) Gibberelia

(c) Human urine

(d) Rhizopus

Option c - Human urine

The gas used for artificial ripening of green fruit is:

(a) Ethane

(b) Acetylene

(c) Carbon-dioxide

(d) Oxytocin

Option b - Acetylene

Which of the following phytohormones is mainly responsible for fruit ripening?

(a) Cytokinin

(b) Abscisic acid

(c) Ethylene

(d) None of these

Option c - Ethylene

Abscisic acid is also known as a stress hormone because:

(a) It is a plant growth inhibitor.

(b) It is an inhibitor of plant metabolism.

(c) It inhibits seed germination.

(d) It increases the tolerance of plants to various kinds of stresses.

Option d - It increases the tolerance of plants to various kinds of stresses

The hormone related to drought tolerance is:

(a) Abscisic acid

(b) Gibberellin

(c) Indole acetic acid

(d) Cytokinin

Option a - Abscisic acid

Which hormone is found in the gaseous form?

(a) Abscisic acid

(b) Ethylene

(c) Gibberellins

(d) Auxins

Option b - Ethylene

Which one among the following hormones stimulates the plant cells to grow in a manner such that the plants bend towards light?

(a) Cytokinin

(b) Auxin

(c) Gibberellin

(d) Abscisic

Option b - Auxin

To increase sugar production in sugarcanes, they are sprayed with

(a) IAA

(b) Cytokinin

(c) Gibberellin

(d) Ethylene

Option c - Gibberellin

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