Question

$100$ zygospores, alternate with empty cells in spirogyra are under _____ conjugation and the total number of daughter filaments formed will be __________

• A. Scalariform, $400$
• B. Lateral, $100$
• C. Lateral , $400$
• D. Scalariform, $100$

Answer 1

Answer: (B)

Lateral, $100$

It is most likely to be lateral conjugation.

Lateral conjugation involves :

1. It occurs in homothallic species.

2. Two cells of same filament take part in Union of gametes.

3. Movement of gametes occur through the passage formed between walls of two adjacent cells.

4. Alternatively cells appear to be empty as zygotes are formed in alternate cells.

Total number of daughter filaments formed will be the same as the number of gametes i.e. 100.

So the correct answer is ' Lateral, 100'.