Obelia is

A

Sedentary

B

Attached but capable of locomotion

C

Motile

D

Free floating.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Obelia's Life Cycle**: Obelia is a type of cnidarian that exhibits a typical life cycle, which includes both polyp and medusa stages. 2. **Identifying the Stages**: The life cycle starts with the planula stage, which is free-living and motile. However, after some time, the planula settles down and attaches to a solid surface. 3. **Polyp Stage**: Once attached, the planula develops into a polyp. The polyp is a sessile (sedentary) form of the organism, meaning it remains fixed in one place and does not move around. 4. **Conclusion**: Since the polyp stage is sedentary and the question asks about the nature of Obelia, the correct answer is that Obelia is sedentary. 5. **Final Answer**: Therefore, the answer to the question "Obelia is" is **sedentary**. ---
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