Q. 1. Write short notes on
Conjugation in Paramoecium (ii) Detorsion in Gastropoda
Answers
conjugation in paramoecium
The Paramecium genus contains numerous species of single-celled microscopic organisms that appear much like a lady's slipper surrounded by tiny hair-like appendages termed cilia. The miniature protozoan glides through water by a coordinated movement of its cilia like millions of miniature oars. Paramecia are generally found in slow moving and still bodies of freshwater, especially in areas containing large amounts of pond scum, which is rich in algae
detorsion of gastropoda
In some forms the changes brought about by torsion are reversed to a certain extent, while in others, e.g., Aplysia a complete reversal of torsion takes place which is known as detorsion, this occurs when the shell is lost or much reduced, the ctenidia liberated from their enclosing case point posteriorly again, their anterior position being of no advantage, and the visceral hump gets completely untwisted.
In Cephalopoda the body has become greatly elongated along the dorso-ventral axis, and as a result of change in the method of locomotion this axis has become the functional anteroposterior axis. A ring of tentacles lies at the anterior end of the body and the visceral hump is posterior, the original mantle cavity has become ventral.
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