Exam-style question
Try this first
Paper 4Theory (Extended)4 marks
Water moves upward in plants through the xylem vessels.
Diagram Description
Diagram of water movement in a plant
The diagram shows water molecules moving upward through xylem vessels from the roots to the leaves. Water evaporates from the leaf surfaces, creating a pulling force.
| Step | Process |
|---|---|
| 1 | Water evaporates from the leaf surfaces. |
| 2 | A pulling force called transpiration pull is created. |
| 3 | Water molecules stick together by cohesion. |
| 4 | A continuous column of water is pulled up through the xylem. |
- a[4]
Explain how water moves upward in the xylem due to transpiration pull and cohesion.
Aim for approximately 4 distinct marking points.
0 of 1 part answered
Answer every part before opening the mark scheme.
Common mistake
No common mistake is linked to this question yet.