Plant KingdomHard
Question
Sometimes a ladder like structure in Spirogyra is formad due to.
Options
A.lateral conjugation
B.asexual reproduction
C.scalariform conjugation
D.direct conjugation
Solution
Conjugation is exchange of genetic meterial i.e. mode of sexual reproduction in lower organisms. Conjugation occurs by two methods-
(i) Scalariform Conjugation
It take place during the night and between the recently divided cells of the conjugating participanting filaments. Opposit e cells of two filaments develope Conjugation tube by lying side by side and parallel to each other . The Conjugation tube between two filement looks like a ladder, through which gamete from one ganetangia pass through to fuse with the passive gamete of another filement.
(ii) Lateral Conjugation
Two adjacent cells of same filement fuction as male and female cells It is commonly reported in S. affnis and S. Fenuissima.
(i) Scalariform Conjugation
It take place during the night and between the recently divided cells of the conjugating participanting filaments. Opposit e cells of two filaments develope Conjugation tube by lying side by side and parallel to each other . The Conjugation tube between two filement looks like a ladder, through which gamete from one ganetangia pass through to fuse with the passive gamete of another filement.
(ii) Lateral Conjugation
Two adjacent cells of same filement fuction as male and female cells It is commonly reported in S. affnis and S. Fenuissima.
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