(a) Water enters a plant through root hair cells - Edexcel - GCSE Biology Combined Science - Question 3 - 2019 - Paper 1
Question 3
(a) Water enters a plant through root hair cells.
Root hair cells have
A
a small surface area and thin cell walls
B
a small surface area and thick cell walls
C
a l... show full transcript
Worked Solution & Example Answer:(a) Water enters a plant through root hair cells - Edexcel - GCSE Biology Combined Science - Question 3 - 2019 - Paper 1
Step 1
Water enters a plant through root hair cells. Root hair cells have
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Answer
The correct answer is C: a large surface area and thin cell walls. This adaptation allows for efficient absorption of water and minerals from the soil.
Step 2
Explain how water in the root is transported to the leaves of the plant.
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Answer
Water is transported from the roots to the leaves primarily through a process called transpiration. The water enters the root hair cells and moves into the root cortex via osmosis. As water evaporates from the stomata in the leaves, it creates a negative pressure in the leaf that pulls water upwards through the xylem vessels. This movement is facilitated by capillary action and cohesion between water molecules.
Step 3
How is sucrose transported from the leaves to other parts of the plant?
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Answer
The correct answer is C: by translocation through the phloem. Sucrose produced during photosynthesis is actively transported into the phloem, where it is then distributed to various parts of the plant.
