The employes sexual reproduction

Options

A. Amoeba
B. Euglena
C. Plasmodium
D. Sycon.

Explanation

To solve the question "Which of the following employs sexual reproduction?" we will analyze each option provided:

### Step 1: Analyze Amoeba
- **Amoeba** is a unicellular organism that primarily reproduces asexually through a process called binary fission. In this process, the organism divides into two identical daughter cells.

### Step 2: Analyze Euglena
- **Euglena** is also a unicellular organism. It typically reproduces asexually by binary fission as well. Under certain conditions, it can undergo sexual reproduction, but this is not its primary mode.

### Step 3: Analyze Plasmodium
- **Plasmodium** is a unicellular parasite that causes malaria. It primarily reproduces asexually in the human host through a process called schizogony. However, it does have a sexual phase in its life cycle that occurs in the mosquito vector. Despite this, the question focuses on the primary mode of reproduction.

### Step 4: Analyze Cycone
- **Cycone** (or Sycon) is a multicellular organism belonging to the phylum Porifera (sponges). It has both sexual and asexual modes of reproduction. It reproduces sexually by producing gametes (sperm and ova) from specialized cells called choanocytes located in the mesoglia.

### Conclusion
After analyzing all the options, we find that the only organism that employs sexual reproduction as a primary mode is **Cycone**.

### Final Answer
The answer is **D. Cycone**.

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