Q34 of 231 Page 94

What is meant by positive phototropism and negative phototropism? Give one example of each type.

Positive phototropism is the movement of a plant part in response to a stimulus (light). If the movement of a plant part away from light then it is known as negative phototropism. The stem of a plant grows and bends towards light represents the positive phototropism while movement of root away from light inside the soil is an example of negative phototropism.


More from this chapter

All 231 →
34

Define phototropism. Give one example of phototropism.

 34

How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.

 35

Define geotropism. Give one example of geotropism.

 35

What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labeled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.