What is phototropism?

(a) Define phototropism. Give one example of phototropism. (b) How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams. (c) What is meant by positive phototropism and negative phototropism? Give one example of each type.

(a) What is (i) phototropism and (ii) geotropism? Given that activity supported by labelled diagrams to show that light and gravity affect the direction of plant growth. (b) Mention the role of the following plant hormones. (i) Auxin (ii) Abscisic acid

A plotted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism. (a) Name the part X of plant. (b) Name the part Y of plant. (c) Which part of the plant, X or Y, will exhibit positive hydrotropism? (d) Which part of the plant, X or Y, can have tendrils on it? (e) Which phytochormone causes the part X to exhibit negative phototropism?

Negative phototropism occurs in

Who discovered that phototropism is the result of presence of more auxin on shaded side than on illuminated side.

Who observed that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light (phototropism)?

Hormone involved in phototropism is

Sensation of phototropism is perceived by

The area of response in phototropism and geotropism is