Osmoregulation occurs in Amoeba and Paramoecium through:

The correct option is C

Contractile vacuole

The correct option is C.

Explanation of the correct answer:

1. Osmoregulation is defined as the process of maintaining a balance in our body fluids.
2. The contractile vacuole is present in Amoeba and Parmoecium for osmoregulation.
3. Its function is to collect the excess water from the cytoplasm and pump it out.
4. Excess fluid in the cytoplasm can cause death.

Explanation of the incorrect options:

Option A:

1. The food vacuole is a membrane-bound sac.
2. It performs digestive functions.

Option B:

Mitochondria produce ATP for the body to be used as energy.

Option D:

An organism's DNA is present in the nucleus.

Final answer: Osmoregulation occurs in Amoeba and Paramoecium through the contractile vacuole.