Question

Roots of a plant typically grow downward, Walt shoots grow upward. This is most likely the result of differences in the-

A) concentrations of auxins in response to gravity


B) speed of fluid transport in response to temperature


C) percentage of open stomata in response to humidity


D) Active transport of nutrients in response to light

Answer 1

A) concentrations of auxins in response to gravity

Step-by-step explanation:

In general, shoots grow in upward direction and roots grow in downward direction, it is based on the phenomenon called gravitropism.

Plants growth and morphogenesis is regulated by the gravity and it is known as gravitropism. Auxin is one of the crucial hormone responsible for the growth of the plant. Gravitistimulation (changes in gravity vector) allows asymmetrical redistribution or lateral and polar transport of auxin (growth hormone) that makes the shoot to grow against the gravity and roots towards the gravity.

So, the gravitropism allows high concentrations of auxin in roots inhibits the growth of roots and in shoots it present at tips of the plants.

Hence, the correct option is A.