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In some frog species, during mating, the male climbs onto the back of the female and grips her with his front legs - NSC Life Sciences - Question 2 - 2023 - Paper 1
Question 2
In some frog species, during mating, the male climbs onto the back of the female and grips her with his front legs. During this time, the female will release about 6... show full transcript
Worked Solution & Example Answer:In some frog species, during mating, the male climbs onto the back of the female and grips her with his front legs - NSC Life Sciences - Question 2 - 2023 - Paper 1
Step 1
Step 2
Explain why the fertilised eggs of these frogs do not survive on land.
Answer
The fertilised eggs do not survive on land primarily because they will dry out. Frogs lay their eggs in water, where they remain protected from desiccation. Additionally, the eggs lack shells, which makes them vulnerable to environmental conditions.
Step 3
Explain how amplexus increases the chances of fertilisation in frogs.
Answer
Amplexus increases the chances of fertilisation as the male and female frogs are in close contact, enabling the male to release sperm directly over the eggs just as the female lays them. This close proximity significantly enhances the likelihood that the eggs will be fertilised.
Step 4
From the information above, explain ONE other strategy that contributes to the reproductive success of the frog species.
Answer
Another strategy that contributes to the reproductive success of frog species is the large number of eggs released during spawning. Frogs typically lay thousands of eggs to ensure that at least some will survive to adulthood, as many will be preyed upon or fail to develop successfully.