Which of the following is a growth movement and which is not?
(b) folding up of petals of dandelion flowers when light fades.

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Solution

The petals of the dandelion flower open during the daytime and close during the night time is an example of photonasty and is a growth movement.

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Similar questions

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.

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

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?

Q. Which of the following is a growth movement and which is not?
(a) folding up of leaves of sensitive plant on touching with hand.
(b) folding up of petals of dandelion flower when light fades.

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

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

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Tropic Movements

Standard VII Biology

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Which of the following is a growth movement and which is not? (b) folding up of petals of dandelion flowers when light fades.

The petals of the dandelion flower open during the daytime and close during the night time is an example of photonasty and is a growth movement.

Which of the following is a growth movement and which is not?
(b) folding up of petals of dandelion flowers when light fades.