Single Choice

Fertilisation is internal is spirogyra. Where would you get zygospores, if 3 filaments are conjugating by scalariform conjugation?

ALateral filaments
BCentral filaments
CCentral filament and both lateral filaments
DEither central or lateral filament
Correct Answer

Solution

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.

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