The plant part which exhibits negative geotropism is:

The movement of a plant part in response to the force of attraction exerted by the earth is called:

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

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

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