Which of the following cell organelles contain their own DNA ?
A. Plastids
B. Mitochondria
C. Nucleus
D. Vacuole
Choose the correct option :

The correct option is A, B and C.

Let us analyze the role and structure of each given cell organelle to determine whether they contain their own DNA:

1. Plastids (A):
Plastids (such as chloroplasts in plant cells) possess their own double-stranded circular DNA as well as 70S ribosomes. This allows them to synthesize some of their own proteins independently, making them semi-autonomous organelles.

2. Mitochondria (B):
Mitochondria, known as the powerhouse of the cell, also contain their own circular DNA and 70S ribosomes. Like plastids, they can replicate independently and synthesize specific proteins required for cellular respiration.

3. Nucleus (C):
The nucleus is the primary control center of eukaryotic cells and houses the majority of the cell's genetic material (genomic DNA) packaged in the form of chromosomes.

4. Vacuole (D):
Vacuoles are membrane-bound organelles involved in storage, maintaining turgor pressure, and waste disposal. They do not contain any DNA.

Therefore, among the options provided, Plastids (A), Mitochondria (B), and the Nucleus (C) all contain their own DNA.