Q62 of 231 Page 94

One of the following is not caused by the growth related movement of the concerned plant part. This is:

Thigmonasty is the non-directional movement of a plant part in response to the touch. The folding up of Mimosa pudica leaves when touching is an example of this process.

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60

Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called:

 61

To which of the following directional stimulus roots of a plant do not respond?

 63

The bending of the root of a plant away from a source of light is caused by a plant hormone called:

 64

Most of the plant hormones promote plant growth. A plant hormone which inhibits growth is: