In which of the following organisms sex determination occurs under the effect of environmental factors?

Options

A. Chrysemys picta
B. Ailuropoda
C. Drosophila melanogaster
D. Pavo cristatus

Explanation

To determine which organism's sex determination is influenced by environmental factors, we can analyze the options provided. Here’s a step-by-step solution:

### Step 1: Understand the concept of sex determination
Sex determination refers to the biological mechanism that decides the development of sexual characteristics in an organism. It can be influenced by genetic factors (like sex chromosomes) or environmental factors (like temperature).

### Step 2: Analyze the given options
We have four organisms to consider:
1. Chrysanthemum
2. Ayurvedic
3. Drosophila melanogaster
4. Pavocrystatus

### Step 3: Identify the organism with environmental sex determination
- **Chrysanthemum**: This is a flowering plant and does not have sex determination influenced by environmental factors.
- **Ayurvedic**: This term does not refer to a specific organism but rather to a system of medicine; hence, it is not applicable.
- **Drosophila melanogaster**: This is a fruit fly, and its sex determination is primarily genetic, based on the presence of sex chromosomes.
- **Pavocrystatus**: This refers to a turtle species, specifically the green sea turtle. In turtles, the sex of the offspring can be determined by the incubation temperature of the eggs. Higher temperatures tend to produce females, while lower temperatures produce males.

### Step 4: Conclusion
The organism in which sex determination occurs under the effect of environmental factors is **Pavocrystatus** (the turtle species).

### Final Answer:
**Pavocrystatus** is the correct answer.

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