Question 40
Question 40 of 40
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Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
18. Variation and selecti...
18.1. Variation

State that ionising radiation and some chemicals increase the rate of mutation

20. Human influences on e...
20.3. Pollution

Explain the process of eutrophication of water, limited to: - increased availability of nitrate and other ions - increased growth of producers - increased decomposition after death of producers - increased aerobic respiration by decomposers - reduction in dissolved oxygen - death of organisms requiring dissolved oxygen in water

20. Human influences on e...
20.4. Conservation

Explain the risks to a species if its population size decreases, reducing genetic variation (knowledge of genetic drift is not required)