Q43 of 231 Page 94

A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to

The roots show positive geotropism and stem or other aerial parts of plants show negative geotropism. Its reverse, the roots show negative phototropism while other aerial parts show positive geotropism.

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41

The movement of sunflower in accordance with the path of the sun is due to:

 42

The plant part which exhibits negative geotropism is:

 44

Which of the following is not caused by a growth movement?

 45

The root of a plant is:

Options -


(i) positively phototropic but negatively geotropic


(ii) positively geotropic but negatively phototropic


(iii) negatively phototropic but positively hydrotropic


(iv) negatively hydrotropic but positively phototropic