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4 (a) Figure 7 shows a single-celled pond organism (Amoeba proteus) - Edexcel - GCSE Biology Combined Science - Question 4 - 2021 - Paper 1
Question 4
4 (a) Figure 7 shows a single-celled pond organism (Amoeba proteus). (i) Which row of the table allows the net diffusion of oxygen into Amoeba proteus? | concentra... show full transcript
Worked Solution & Example Answer:4 (a) Figure 7 shows a single-celled pond organism (Amoeba proteus) - Edexcel - GCSE Biology Combined Science - Question 4 - 2021 - Paper 1
Step 1
Which row of the table allows the net diffusion of oxygen into Amoeba proteus?
Answer
To determine the correct row that allows the net diffusion of oxygen into Amoeba proteus, we need to identify when the concentration of oxygen in the water is higher than in the Amoeba itself. Looking at the table:
- Row A: 4 ppm (water) vs 4 ppm (Amoeba) – no net diffusion
- Row B: 4 ppm (water) vs 4 ppm (Amoeba) – no net diffusion
- Row C: 10 ppm (water) vs 10 ppm (Amoeba) – no net diffusion
- Row D: 4 ppm (water) vs 4 ppm (Amoeba) – no net diffusion
In this case, Option C is the only row where the concentration in water (10 ppm) is higher than in Amoeba (4 ppm). Therefore, the correct answer is:
Answer: C
Step 2