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a
Root hairs absorb water and minerals from the soil.
b
Root increases in length due to region of elongation.
c
Meristematic region has thin walled cells with dense cytoplasm.
d
Roots cannot synthesize plant growth regulators.
answer is D.
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Detailed Solution
The main functions of the root system are absorption of water and minerals from the soil, providing a proper anchorage to the plant parts, storing reserve food material and synthesis of plant growth regulators.