Q25 of 231 Page 93

Define chemotropism. Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.

Due to chemical stimulus, the growth of a plant part is known as chemotropism. For example, a sugary substance can induce to the growth of pollen tube towards the ovule. Here, sugary substance works as a stimulus and this process represents the positive chemotropism.


More from this chapter

All 231 →
23

What is a tendril? Name the two types of tendrils. What does a tendril do in response to the touch of a support? What is this phenomenon known as?

 24

Name the five types of tropisms. How are tropic movements helpful to plants? Explain with an example.

 26

Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.

 27

What is meant by nastic movements in plants? Give one example of nastic movements in plants.