Why is the closingof a dandelion flower at dusk (when it gets dark) not a tropism?

Why is the closing of a Dandelion flower at dusk (when it gets dark) not a tropism?

Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?

Why is heart wood dark in colour?

Why is heart wood dark in colour?

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

Why is the innermost zone of candle called the dark zone?

(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, and (ii) at night? What is this phenomenon known as?

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.