Hydra is

Options

A. marine, radially symmetrical and diploblastic
B. Fresh water, biradially symmetrical and triploblastic
C. fresh water,radially symmetrical and diploblastic
D. marine,radially symmetrical and triploblastic

Answer

To answer the question "Hydra is," we need to analyze the characteristics of Hydra based on the provided options. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Habitat of Hydra
Hydra is primarily found in freshwater environments. This eliminates options that describe Hydra as a marine organism.

**Hint:** Consider where Hydra is commonly found—think about freshwater versus marine habitats.

### Step 2: Determine the Symmetry of Hydra
Hydra exhibits radial symmetry. This means that its body can be divided into similar halves by multiple planes passing through the central axis.

**Hint:** Recall the definitions of radial and bilateral symmetry and how they apply to the body structure of organisms.

### Step 3: Understand the Germ Layers of Hydra
Hydra is classified as diploblastic, meaning it has two primary germ layers: ectoderm and endoderm. This is a characteristic of organisms in the phylum Cnidaria, to which Hydra belongs.

**Hint:** Remember the difference between diploblastic and triploblastic organisms in terms of germ layers.

### Step 4: Analyze the Options
Now, let’s look at the options provided:
- **Option A:** Marine, radially symmetrical, and diploblastic (Incorrect: Hydra is not marine)
- **Option B:** Freshwater, bilaterally symmetrical, and triploblastic (Incorrect: Hydra is not bilaterally symmetrical and is diploblastic)
- **Option C:** Freshwater, radially symmetrical, and diploblastic (Correct: This accurately describes Hydra)
- **Option D:** Marine, radially symmetrical, and triploblastic (Incorrect: Hydra is not marine and is diploblastic)

### Conclusion
Based on the analysis, the correct answer is **Option C: Freshwater, radially symmetrical, and diploblastic**.

**Final Answer:** Hydra is freshwater, radially symmetrical, and diploblastic.

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