What is direct and indirect fertilisation?
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Direct development
1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage. 2. Metamorphosis is absent. 3. It occurs in fishes, reptiles, birds, and mammals.
Indirect development: 1. It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults. 2. Metamorphosis involving development of larva to a sexuallymature adult is present. 3. It occurs in most of the invertebrates and amphibians.
1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage. 2. Metamorphosis is absent. 3. It occurs in fishes, reptiles, birds, and mammals.
Indirect development: 1. It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults. 2. Metamorphosis involving development of larva to a sexuallymature adult is present. 3. It occurs in most of the invertebrates and amphibians.
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