Multiple Choice
Why is phototropism important for plants?
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37. Plant Sensation and Response
Phototropism
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Which of the following best describes gravitropism in plants?
A
The movement of a plant toward or away from light.
B
The process by which plants lose water vapor through their leaves.
C
The response of a plant to touch or physical contact.
D
The growth response of a plant to gravity, such as roots growing downward and shoots growing upward.
Verified step by step guidance1
Understand the term 'gravitropism': Gravitropism is a biological phenomenon where plants respond to gravity by directing their growth. Roots typically grow downward (positive gravitropism), while shoots grow upward (negative gravitropism).
Differentiate gravitropism from other plant responses: Gravitropism is distinct from phototropism (response to light), transpiration (loss of water vapor), and thigmotropism (response to touch). This ensures clarity in identifying the correct description.
Recognize the role of specialized cells: Plants detect gravity using specialized cells called statocytes, which contain dense starch-filled organelles called statoliths. These help the plant sense the direction of gravity.
Understand the mechanism: When statoliths settle due to gravity, they signal the redistribution of growth hormones like auxins. Auxins accumulate on the lower side of the plant, promoting differential growth—roots grow downward, and shoots grow upward.
Apply the concept to the options provided: Evaluate each option and identify the one that matches the definition of gravitropism. The correct answer is the growth response of a plant to gravity, such as roots growing downward and shoots growing upward.
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