Biology
General
Easy
Question
In 
sometimes a ladder-like structure is present due to
- Vegetative reproduction
- Asexual reproduction
- Lateral conjugation
- Scalariform conjugation
The correct answer is: Scalariform conjugation
Sexual reproduction I 
takes place by conjugation. Scalariform conjugation occurs between the cells belonging to different filaments. Hence, these species are heterothallic. Lateral conjugation is primitive than scalariform conjugation.
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