Question

If three filaments are involved in lateral conjugation in Spirogyra, zygospores will be found in

• A. All the three filaments
• B. Only the middle filament
• C. Lateral filaments
• D. Either B or C

Answer 1

The correct option is D Either B or C

In Spirogyra, both lateral and scalariform conjugation has been observed.

During the scalariform conjugation, a pair of filaments either central or lateral align themselves laterally and connects through branch-like conjugation tubes.

This tube grows from each of the filament and meets in the centre to form a space in which zygote moves. Each zygote will grow in a filament.

During the lateral conjugation, gametes produced by adjacent cells on the same filament meet and develop within a short, curved conjugation tube.

So, the correct option is D.