(i) Radial symmetrical
(ii) Diploblastic
(iii) The cellular level of organization
(iv) Digestion is intracellular only
(v) Exhibit two basic body forms called polyp and medusa.
How many points are correct about Obelia?

Options

A. Two
B. Three
C. Four
D. Five

Answer

To determine how many points are correct about Obelia, let's analyze each statement step by step:

1. **Radial Symmetry**:
- Obelia exhibits radial symmetry, meaning that if you were to draw a line through the center of the organism, it would divide into two equal halves.
- **Conclusion**: This statement is correct.

2. **Diploblastic**:
- Obelia is classified as diploblastic, which means it has two germ layers: ectoderm and endoderm.
- **Conclusion**: This statement is correct.

3. **The Cellular Level of Organization**:
- Obelia does not have a cellular level of organization; instead, it has a tissue level of organization. This means that its cells are organized into tissues.
- **Conclusion**: This statement is incorrect.

4. **Digestion is Intracellular Only**:
- In Obelia, digestion occurs both intracellularly (within cells) and extracellularly (outside cells). Therefore, stating that digestion is intracellular only is incorrect.
- **Conclusion**: This statement is incorrect.

5. **Exhibit Two Basic Body Forms Called Polyp and Medusa**:
- Obelia indeed exhibits two basic body forms: the polyp and the medusa. The polyp is typically the sessile form, while the medusa is the free-swimming form.
- **Conclusion**: This statement is correct.

Now, let's summarize the correctness of each statement:
- Statement 1: Correct
- Statement 2: Correct
- Statement 3: Incorrect
- Statement 4: Incorrect
- Statement 5: Correct

**Total Correct Statements**: 3

Thus, the answer to the question is **B - 3 points are correct about Obelia**.