Correct Option
The correct option is (a).
Explanation
Binary fission is a primary mode of asexual reproduction observed predominantly in unicellular organisms. In this process, a single parent cell divides into two genetically identical daughter cells.
Statement-wise Analysis:
- Statement 1 is Correct: Binary fission is a method of asexual reproduction. It involves a single parent, does not involve the fusion of gametes, and produces offspring that are clones of the parent.
- Statement 2 is Incorrect: Binary fission is characteristic of unicellular organisms such as Amoeba, Paramecium, and bacteria. Hydra is a multicellular organism that reproduces asexually through a different process known as budding.
- Statement 3 is Incorrect: The biological sequence of binary fission involves the division of the nucleus (karyokinesis) first, followed by the division of the cytoplasm and body (cytokinesis). The statement incorrectly reverses this order.
Key Takeaway:
Binary fission is restricted to unicellular organisms and strictly follows the sequence of nuclear division followed by cytoplasmic division. Multicellular organisms like Hydra reproduce via budding.