CIE iGCSE Co-Ordinated Science B8.2 Water uptake Exam Style Questions Paper 4
Question
Fig. 4.1 summarises one pathway of water through a plant.
(a) Identify the cells labelled Y and Z in Fig. 4.1.
Y ……………………………………………………………………………………………………………………………..
Z ……………………………………………………………………………………………………………………………..
(b) Describe two ways that cell X in Fig. 4.1 is adapted for photosynthesis.
1 ………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
2 ………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
(c) Explain the effect of an increase in humidity on the process occurring at A in Fig. 4.1.
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(d) Complete the sentences to explain how water is moved in part B in Fig. 4.1.
Water is moved up part B by …………………………………………………… pull.
This creates a …………………………………………………… gradient, drawing up a column of water molecules that are held together by …………………………………………………… .
▶️Answer/Explanation
Ans: 4(a) Y root hair (cell) ;
Z (root) cortex (cell) ;
4(b) contains lots of chloroplasts ;
positioned at the top of the leaf (for maximum light) ;
column-shaped/AW ;
AVP ;
4(c) decrease in evaporation (from the surfaces of mesophyll cells) ;
due to a decrease in concentration/diffusion gradient (of water vapour)/AW ;
4(d) transpiration ;
water potential ;
cohesion ;