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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.

Related tags

Control CoordinationPlant HormonesPlant GrowthPlant HormonesControl And CoordinationScienceClass 10 Mcq

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