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Q.

Which of the following terms describes the geotropic sensitivity of tertiary roots?

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a

Negatively geotropic

b

Ageotropic

c

 Plagiogeotropic

d

Positively geotropic

answer is D.

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Detailed Solution

Geotropism is the growth or movement of an organism in response to gravity. 

Tertiary roots are the smallest and finest roots in the plant root system that do not exhibit geotropic sensitivity. This is why they are ageotropic.

Positively geotropic growth or movement is towards the gravitational force. 

Negatively geotropic growth or movement is away from the gravitational force. 

Plagiogeotropic is the horizontal growth or orientation of an organism in response to gravity,.

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Which of the following terms describes the geotropic sensitivity of tertiary roots?