Question

Given below are two statements
Statement I: Growth regulators which control plant growth and development are called phytohormones.
Statement II: Apical meristems are responsible for growth in length of branches and roots.
In light of the above statements, choose the correct answer from the options given below

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Hint:

Apical = Primary Growth (Length).
Lateral = Secondary Growth (Girth/Thickness).
Phytohormones are to plants what endocrine hormones are to animals.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question covers basic concepts of plant physiology (hormones) and plant anatomy (meristems).

Step 2: Detailed Explanation:

• Analysis of Statement I: Phytohormones (Plant hormones) are naturally occurring organic substances that act as chemical messengers. They are synthesized in one part of the plant and translocated to another to regulate physiological processes like growth, flowering, and ripening. Common examples include auxins, gibberellins, and cytokinins. Thus, Statement I is True.

• Analysis of Statement II: Apical meristems are found at the tips (apices) of shoots and roots. They consist of actively dividing cells that contribute to primary growth, which is an increase in the length of the plant body. Root apical meristems lengthen the roots, and shoot apical meristems lengthen the stem and branches. Thus, Statement II is True.
Final Answer:
Both statements accurately describe fundamental biological processes in plants.