What is a chemical substance that affects the direction of growth in plants called?
Answer and explanation
Correct answer: Plant hormone
The governing concept is chemical coordination in plants. Plants lack a nervous system, so specialised chemical messengers regulate growth, development, and directional responses such as bending toward light or gravity. These substances are called plant hormones or phytohormones, making option A correct. Digestive juice belongs to animal digestion, blood transports materials in animals, and a nerve is a nervous-system structure rather than a plant growth regulator.
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What is the correct answer to this question?
Plant hormone
Why is this the correct answer?
The governing concept is chemical coordination in plants. Plants lack a nervous system, so specialised chemical messengers regulate growth, development, and directional responses such as bending toward light or gravity. These substances are called plant hormones or phytohormones, making option A correct. Digestive juice belongs to animal digestion, blood transports materials in animals, and a nerve is a nervous-system structure rather than a plant growth regulator.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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