Which developmental constraint limits the size of insect imaginal discs within a larva?

💡 Explanation

When the larval body grows, oxygen diffusion limits imaginal disc size because tracheal system density doesn't increase proportionally, creating a hypoxic core and constrained cell proliferation. Therefore the pupa's final form is partly regulated by oxygen distribution, rather than nutrient access, or cuticle stress, which have different regulatory impacts.

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