Question

Sometimes a ladder-like structure in Spirogyra is formed due to:

• A. Lateral conjugation
• B. Asexual reproduction
• C. Scalariform conjugation
• D. Direct conjugation

Answer 1

The correct option is C Scalariform conjugation

Conjugation is an exchange of genetic material, i.e, mode of sexual reproduction in lower organisms.
Scalariform conjugation: It takes place during the night and between the recently divided cells of the conjugating participating filaments. Opposite cells of two filaments develop a conjugation tube by lying side by side and parallel to each other. The conjugation tube between two filaments looks like a ladder, through which gamete from one gametangium passes through to fuse with the passive gamete of another filament.