Edexcel IGCSEBiologyGeneral Applications7 Marks
Water is absorbed by plant roots and transported to the leaves.
- (a)Name the tissue responsible for transporting water in plants.[1]
- (b)Describe how water moves from the soil into the root hair cells.[3]
- (c)Explain how transpiration contributes to the movement of water up a plant.[3]
Mark scheme
Marking points from the official mark scheme. The mark or mark type is shown in brackets.
- 12(a) B1: xylem (1)
- 12(b) M1: root hair cells have a lower water potential than soil (water) (1)
- M1: water moves by osmosis (1)
- A1: across a partially permeable membrane (into the root hair cell) (1)
- 12(c) M1: water evaporates from the leaves (through stomata) (1)
- M1: creates a transpiration pull / tension / suction (1)
- A1: water molecules cohere / stick together / form a continuous column (due to hydrogen bonding) (1)
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