Question

Ladder-like structure in Spirogyra represents

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

Answer 1

Answer: (B)

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 develope a conjugation tube by lying side by side and parallel to each other. The conjugation tube between two filament looks like a ladder, through which gamete from one gametangia passes through to fuse with the passive gamete of another filament. so option B is correct