There is no natural death in single-celled organisms like amoeba and bacteria because:

Correct answer: 3

Solution:

Concept:

• Amoeba and bacteria are unicellular organisms that reproduce via binary fusion
• They are asexual organisms.

Explanation:

Option 1)  They cannot reproduce sexually- INCORRECT

• Amoeba and bacteria cannot reproduce sexually.
• This option is the incorrect option.

Option 2)  They reproduce by binary fission- INCORRECT

• Amoeba and bacteria reproduce asexually.
• However, it is not the direct reason but forms the basis for no natural death in single-celled organisms.
• This option is the incorrect option.

Option 3)  Parental body is distributed among the offspring- CORRECT

• During the asexual reproduction of amoeba and bacteria, they produce progeny after replicating their genetic material through mitotic division.
• After that, the cell divides into two equal-sized daughter cells which are identical to the parents.
• Thus, the parental body is distributed among the offspring, so no natural death occurs in single-celled organisms like amoeba and bacteria.
• The parent continues to live as two daughter cells.
• So, this option is correct

 Option 4)  They are microscopic - INCORRECT

• They are microscopic organisms. But, this is not the basis for no natural death in single-celled organisms.
• This is the incorrect option.

So, the correct option is Option 3)  Parental body is distributed among the offspring.