Formative Practice 5.1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
State the definition of tropism.

Tropism is the responses of certain parts of a plant such as roots or shoots that respond towards or away from a stimulus.

Question 2:
List three types of tropism.

Thigmotropism, hydrotropism, geotropism, chemotropism and phototropism.

Question 3:
Justify phototropism in plants.

Positive phototropism ensures leaves get the optimum amount of sunlight to increase the rate of photosynthesis.

Question 4:
Danish discovered that the mimosa leaves fold up when a flame from a lighter was held close to its leaves. Explain this observation.

The mimosa plant is responding to heat, which is thermonasty.

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