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White clover (Trifolium repens) can be either cyanogenic, that is, it produces hydrogen cyanide; or non-cyanogenic, that is, it does not produce hydrogen cyanide - VCE - SSCE Biology - Question 21 - 2005 - Paper 1
Question 21
White clover (Trifolium repens) can be either cyanogenic, that is, it produces hydrogen cyanide; or non-cyanogenic, that is, it does not produce hydrogen cyanide. Th... show full transcript
Worked Solution & Example Answer:White clover (Trifolium repens) can be either cyanogenic, that is, it produces hydrogen cyanide; or non-cyanogenic, that is, it does not produce hydrogen cyanide - VCE - SSCE Biology - Question 21 - 2005 - Paper 1
Step 1
One selective pressure that would lead to a population with a low number of non-cyanogenic clover plants is:
Answer
The correct answer is A. grazing action of snails and slugs. This is because snails and slugs consume cyanogenic plants, which decreases the prevalence of non-cyanogenic clover plants in the population. In environments where snails and slugs are prevalent, the selective pressure would favor the survival of cyanogenic plants, leading to a lower number of non-cyanogenic plants.