Q. What is the main purpose of root hairs in plants?
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A.
Photosynthesis
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B.
Water absorption
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C.
Nutrient storage
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D.
Gas exchange
Solution
Root hairs increase the surface area of roots, enhancing the plant's ability to absorb water and nutrients from the soil.
Correct Answer:
B
— Water absorption
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Q. What is the primary driving force for the movement of nutrients in phloem?
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A.
Root pressure
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B.
Transpiration pull
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C.
Pressure flow mechanism
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D.
Capillary action
Solution
The pressure flow mechanism explains how sugars are actively transported into the phloem, creating a pressure gradient that drives flow.
Correct Answer:
C
— Pressure flow mechanism
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Q. Which ion is crucial for the opening and closing of stomata?
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A.
Calcium
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B.
Potassium
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C.
Sodium
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D.
Magnesium
Solution
Potassium ions play a key role in the turgor pressure changes that open and close stomata.
Correct Answer:
B
— Potassium
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Q. Which of the following is a mechanism of nutrient uptake in plant roots?
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A.
Facilitated diffusion
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B.
Endocytosis
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C.
Active transport
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D.
All of the above
Solution
Plants utilize facilitated diffusion, endocytosis, and active transport to absorb nutrients from the soil.
Correct Answer:
D
— All of the above
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Q. Which process primarily drives the movement of water in plants?
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A.
Diffusion
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B.
Osmosis
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C.
Active transport
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D.
Transpiration
Solution
Transpiration creates a negative pressure in the leaves, which helps pull water upward through the xylem.
Correct Answer:
D
— Transpiration
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Q. Which structure in plant cells is responsible for the synthesis of sugars?
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A.
Mitochondria
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B.
Chloroplasts
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C.
Ribosomes
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D.
Endoplasmic reticulum
Solution
Chloroplasts are the organelles where photosynthesis occurs, leading to the synthesis of sugars.
Correct Answer:
B
— Chloroplasts
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