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 :

(a) phototropism

(b) thigmonasty

(c) chemotropism

(d) photonasty

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Solution

(d) photonasty
The response of dandelion flowers to light that involves the movement of the petals is an example of photonasty.

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Q. 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 :
(a) phototropism
(b) thigmonasty
(c) chemotropism
(d) photonasty

(a) What does a Mimosa pudica plant do in response to touch? What is this phenomenon known as?

(b) What happens to the dandelion flower

(i) during daytime

(ii) at night?

What is this phenomenon known as?

There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and drooop when touched with fingers or any other solid object.

(a) Name the phenomenon shown by the flowers of (i) plant A, and (ii) plant B.

(b) Name one flower each which behaves like the flower of (i) plant A, and (ii) plant B.

(d) Name a plant whose leaves behave like those of plant C.

(e) Which plant / plants exhibit the phenomenon based on growth movements?

The bending of the shoot of a plant in response to light is called :

(a) geotropism

(b) phototropism

(d) photonasty

When the leaves of a sensitive plant are touched with a finger, they fold up and when the light fades at dusk, the petals of a dandelion flower close.

(a) State one way in which the above two processes are similar.

(b) State two ways in which the above two processes differ.

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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 : (a) phototropism (b) thigmonasty (c) chemotropism (d) photonasty

(d) photonasty The response of dandelion flowers to light that involves the movement of the petals is an example of photonasty.

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 :

(a) phototropism

(b) thigmonasty

(c) chemotropism

(d) photonasty

(d) photonasty
The response of dandelion flowers to light that involves the movement of the petals is an example of photonasty.