Multiple choice

Which of the following is correct about spirogyra?

  1. Filaments showing scalariform conjugation are homothallic.

  2. Filaments showing lateral conjugation are always homothallic.

  3. Filaments showing lateral conjugation may be homothallic.

  4. Asexual reproduction by zoospores.
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B Correct answer
Explanation

In lateral conjugation, gametes are formed in a single filament. Two adjoining cells near the common transverse wall give out protuberances known as conjugation tubes, which further form the conjugation canal upon contact. The male cytoplasm migrates through the conjugation canal, fusing with the female. The rest of the process proceeds as in scalariform conjugation. Filaments showing lateral conjugation are always homothallic.

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