Which of the following is correct about embryo development in Periplaneta americana ?

Options

A. No metamorphosis
B. Direct metamorphosis
C. Complete metamorphosis
D. Paurometaboly

Answer

To solve the question regarding embryo development in Periplaneta americana (the common cockroach), we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Embryonic Development Types**:
- There are different types of embryonic development in insects: no metamorphosis (direct development), incomplete metamorphosis, and complete metamorphosis.

2. **Evaluating Option 1: No Metamorphosis**:
- No metamorphosis, also known as direct development, means that the embryo develops directly into a mature individual without any larval stage. This is not applicable to Periplaneta americana, as it does not exhibit this type of development.

**Hint**: Remember that no metamorphosis implies a direct transition from embryo to adult without larval stages.

3. **Evaluating Option 2: Direct Metamorphosis**:
- This term is often used interchangeably with no metamorphosis, which we already established is incorrect for Periplaneta americana. Hence, this option is also wrong.

**Hint**: Direct metamorphosis is synonymous with no metamorphosis, which does not apply here.

4. **Evaluating Option 3: Complete Metamorphosis**:
- Complete metamorphosis involves four distinct life stages: egg, larva, pupa, and adult. This type of development is not characteristic of Periplaneta americana, which does not undergo a larval or pupal stage.

**Hint**: Complete metamorphosis includes a larval stage, which is not present in cockroaches.

5. **Evaluating Option 4: Paramatavalli**:
- The term "Paramatavalli" refers to the specific type of embryonic development in Periplaneta americana. This option is correct as it describes the development process accurately.

**Hint**: Look for specific terminology that relates to the unique development process of the organism in question.

### Conclusion:
After evaluating all options, the correct answer regarding embryo development in Periplaneta americana is **Option 4: Paramatavalli**.