A potted 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.
(e) Which phytohormone causes the part X to exhibit negative phototropism?

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Solution

Auxin is made by cells at the tip of stems and roots. Auxin moves away from light, and towards gravity.

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Similar questions

The root of a plant is :

(i) positively phototropic but negatively geotropic

(ii) positively geotropic but negatively phototropic

(iii) negatively phototropic but positively hydrotropic

(iv) negatively hydrotropic but positively phototropic

(a) Define geotropism. Give one example of geotropism.

(b) What is meant by 'positive geotropism' and 'negative geotropism'? Give one example of each type. Draw a lablled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.

Q. Which part of the plant exhibits negative phototropism?

Q. Which of the following plant part exhibits negative phototropism?

Q. Give one example each of a plant parts:
(b) which is positively phototropic but negatively geotropic.

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