BIOMOLECULES AND ENZYMES

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BIOLOGY

HORMONES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Tony wanted to see if he could make the roots of a plant grow up instead of down. After several tries, he found that the roots always grew down. Nothing he or his teacher did made the roots grow up. What keeps the roots from growing up?
A
The roots need water.
B
Sunlight hits the plants.
C
Gravity pulls on the roots.
D
There is plant food in the soil.
Explanation: 

Detailed explanation-1: -Gravitropism in Arabidopsis thaliana Gravitropism is an important plant growth response to the environment that directs shoots upward and roots downward, thereby allowing each organ to reach environments that are adequate for performance of their primary functions.

Detailed explanation-2: -The roots grown downward in the direction of gravity, which is positive gravitropism, and the shoot grows upward away from gravity, which is negative gravitropism. The reason plants know which way to grow in response to gravity is due to amyloplasts in the plants.

Detailed explanation-3: -No, they cannot continue growing. This is because the apical meristematic tissues essential for their growth is present on tips. If the tips are removed, the roots can’t grow.

Detailed explanation-4: -One of the key parameters that every plant must respond to is the direction of gravity: stems go up (opposite to the pull of gravity) and roots go down (in the same direction as the force of gravity).

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