19. Which of these statements about the size of the Murray Cod is true?

Question

19.  Which of these statements about the size of the Murray Cod is true?

BlackTom AI · Accepted Answer

Question restatement: Which of these statements about the size of the Murray Cod is true? Options:
1) Both sexes reach their largest size by 5 years.
2) Female cod grow faster than males.
3) Females are sexually mature at an earlier age.
4) Females can reach a greater size than males.

Now, evaluate each option in turn with reasoning:

Option 1: 'Both sexes reach their largest size by 5 years.' This claim asserts a uniform growth limit for males and females by a specific age. In Murray cod, there is a documented size difference between the sexes, with females typically attaining a larger maximum size than males. Because the statement implies both sexes stop growing at the same time and to the same ultimate size, it contradicts the known sexual dimorphism in size. Therefore, this option is not supported by the axial pattern of growth in Murray cod.

Option 2: 'Female cod grow faster than males.' The idea here is that females outpace males in growth rate. While growth rate can vary with environment and age, the established size difference in Murray cod is generally about eventual maximum size rather than a consistent, across-the-board faster growth rate for females. This makes the blanket claim of faster female growth unreliable as a general rule across the life history, so this option is not the best fit for describing the true size relationship.

Option 3: 'Females are sexually mature at an earlier age.' This option centers on maturity timing rather than ultimate size. Even if maturity ages are discussed, the question is about size differences. Without a clear, consistent link that earlier maturity directly corresponds to a larger eventual size in Murray cod, this statement could be misleading. Additionally, evidence on maturity timing does not inherently establish the magnitude or direction of adult size advantage, rendering this option insufficient to explain size differences.

Option 4: 'Females can reach a greater size than males.' This option directly addresses the core question about size, and it aligns with the commonly reported pattern of sexual dimorphism in Murray cod, where females achieve a larger maximum length and weight than males. This statement coherently matches the observed biological pattern and is the most consistent answer with the size-related facts about Murray cod.

Summary: Each of the first three choices describes a growth or maturation aspect that either contradicts or does not directly establish the observed sexual size difference. The fourth option specifically states that females can reach a greater size, which matches the known sexual dimorphism in Murray cod and is therefore the true statement.

19. Which of these statements about the size of the Murray Cod is true?单项选择题

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