(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
-... 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
Root hair cells have
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Answer
The correct answer is C a large surface area and thin cell walls. This feature allows for efficient absorption of water due to the increased surface area, facilitating osmosis.
Step 2
Explain how water in the root is transported to the leaves of the plant.
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Answer
Water is absorbed by root hair cells and moves through the root cortex. It travels via two main pathways: the apoplast pathway (through cell walls) and the symplast pathway (through cytoplasm). After reaching the xylem, water is transported upwards due to capillary action and the process of transpiration, where water vapor escapes from the leaves, creating a negative pressure that pulls more water up from the roots.
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 is actively loaded into the phloem from the leaf cells, allowing it to be transported to other parts of the plant.
