Changes involving conversion of larva into adult are

Options

A. Metastasis
B. Metamorphosis
C. Metagenesis
D. Alternation of generations.

Answer

To answer the question regarding the changes involving the conversion of larva into adult, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Concept**: The process of transformation from larva to adult is a significant biological phenomenon observed in various organisms, particularly in amphibians like frogs.

2. **Example of Tadpole to Frog**: A classic example is the transformation of a tadpole (larval stage) into an adult frog. The tadpole lives in water and has gills for respiration.

3. **Development of Lungs**: As the tadpole matures, it undergoes physiological changes, including the development of lungs, which will allow it to breathe air as an adult frog.

4. **Types of Respiration**: In adult frogs, respiration occurs through three methods: pulmonary (lungs), cutaneous (skin), and buccopharyngeal (mouth). However, during the tadpole stage, respiration is primarily through gills.

5. **Identifying the Process**: The overall process of transformation from larva to adult is termed **metamorphosis**. This term encompasses all the changes that occur during this developmental stage.

6. **Differentiating from Other Terms**:
- **Metastasis**: This term refers to the spread of cancer cells from the primary site to other parts of the body, which is unrelated to larval development.
- **Metagenesis**: This refers to the alternation of generations, where organisms have two distinct forms in their life cycle (e.g., polyp and medusa in cnidarians), but it does not specifically describe the transformation from larva to adult.

7. **Conclusion**: Therefore, the correct answer to the question is **metamorphosis**, as it specifically describes the changes that occur when a larva transforms into its adult form.