CIE iGCSE Co-Ordinated Science B3.2 Osmosis Exam Style Questions Paper 4
Question
(a) (i) State the name of the effect shown by the change in appearance of the cells.
▶️Answer/Explanation
Answer: Plasmolysis
Detailed Solution: – Plasmolysis occurs when plant cells lose water and shrink away from the cell wall due to being placed in a hypertonic solution (e.g., concentrated glucose solution).
(ii) Explain the process that causes the cells in Fig. 10.1 to change appearance when immersed in concentrated glucose solution.
▶️Answer/Explanation
Answer: Water moves out of the cells by osmosis, causing them to shrink.
Detailed Solution: – The concentrated glucose solution has a lower water potential than the cell cytoplasm. – Water moves out of the cells by osmosis, causing the cells to shrink and the cytoplasm to pull away from the cell wall (plasmolysis).
(b) State the two main substances transported during translocation.
▶️Answer/Explanation
Answer: Sucrose; amino acids
Detailed Solution: – Translocation is the movement of sucrose and amino acids through the phloem from sources (e.g., leaves) to sinks (e.g., roots, fruits).