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Figure 7 shows a single-celled pond organism (Amoeba proteus) - Edexcel - GCSE Biology Combined Science - Question 4 - 2021 - Paper 1
Question 4
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? | concentration o... show full transcript
Worked Solution & Example Answer: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 which row allows the net diffusion of oxygen into the Amoeba proteus, we need to compare the concentration of oxygen in the water to the concentration within the organism. According to the principles of diffusion, oxygen will diffuse from an area of higher concentration to an area of lower concentration.
- Row A: Water - 4 ppm, Amoeba - 4 ppm (no net diffusion)
- Row B: Water - 4 ppm, Amoeba - 4 ppm (no net diffusion)
- Row C: Water - 10 ppm, Amoeba - 10 ppm (no net diffusion)
- Row D: Water - 4 ppm, Amoeba - 4 ppm (no net diffusion)
Therefore, the correct choice is D as it presents a case where diffusion is balanced, and in contextual usage, none allowed for effective diffusion. However, if there is oxygen in the water compared to the organism, for valid diffusion, the only possible correct combination for diffusion is found with a greater concentration in water than inside the organism. Hence row C, would yield diffusion. In essence for diffusion to occur the formula used is concentration of water > concentration of Amoeba.
Step 2