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Sponges remain fixed to a substratum and do not move from place to place. This habit is described by which term?
AHermaphrodite
BParasitic
CMigratory
DSedentary
Answer & Solution
Correct answer: D. Sedentary
1. Sponges attach to the substratum and show no locomotion.
2. Such fixed animals are called sedentary.
3. Rule out parasitic: that describes nutrition on a host, not the fixed habit.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.76_
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