Tadpole larva of frog is a good example of

Options

A. retrogressive metamorphosis
B. neoteny
C. parthenogenesis
D. biogenetic law

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks what the tadpole larva of a frog is a good example of among the options provided: retrogressive metamorphosis, neoteny, parthenogenesis, and biogenetical law.

2. **Analyzing Each Option**:
- **Retrogressive Metamorphosis**: This refers to a process where the larval stage has more complex features than the adult stage. In the case of a tadpole, it has a tail and gills, which are lost in the adult frog. This suggests a reduction of features, making this option relevant.
- **Neoteny**: This is the retention of juvenile features in the adult stage. While tadpoles do retain some juvenile characteristics, they eventually undergo metamorphosis into adult frogs, which do not retain these features. Therefore, this option does not apply.
- **Parthenogenesis**: This is a form of asexual reproduction where offspring are produced without fertilization. Tadpoles are not produced this way; they develop from fertilized eggs. Thus, this option is not applicable.
- **Biogenetical Law**: This law, often referred to as "ontogeny recapitulates phylogeny," suggests that the development of an individual organism (ontogeny) follows the same progression as the evolutionary history of that organism (phylogeny). While tadpoles do reflect certain evolutionary traits, this term does not directly apply to the tadpole itself.

3. **Conclusion**: After analyzing all options, the most fitting answer is **retrogressive metamorphosis**, as tadpoles exhibit characteristics that are lost in the adult stage of frogs.

**Final Answer**: The tadpole larva of a frog is a good example of **retrogressive metamorphosis**.

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