Which one grows over molluscan shell

Options

A. Characium
B. Spirogyra
C. Cladophora
D. Protoderma.

Answer

To solve the question "Which one grows over molluscan shell?", we can follow these steps:

### Step 1: Understand the Question
We need to identify which organism grows specifically on molluscan shells. Molluscan shells are the hard outer coverings of mollusks, which are soft-bodied animals.

**Hint:** Think about the types of organisms that are known to grow on or attach to other living organisms or surfaces.

### Step 2: Analyze the Options
We have four options to consider:
- A. Carcium
- B. Spirogyra
- C. Cladophora
- D. Protoderma

**Hint:** Consider what each of these organisms is known for and their typical habitats.

### Step 3: Evaluate Each Option
- **A. Carcium**: This organism is known to grow on the legs of certain animals, not on molluscan shells.
- **B. Spirogyra**: This is a free-floating alga that typically does not attach to surfaces like molluscan shells.
- **C. Cladophora**: This is a type of green algae that is known to grow on various surfaces, including molluscan shells.
- **D. Protoderma**: This organism is known to grow on turtles, not specifically on molluscan shells.

**Hint:** Focus on the characteristics of Cladophora and its relationship with mollusks.

### Step 4: Identify the Correct Answer
Based on the evaluation, Cladophora is the only option that is known to grow on molluscan shells.

**Final Answer:** The correct answer is **C. Cladophora**.

### Summary
To summarize, we analyzed the question, evaluated each option based on their known habitats, and determined that Cladophora is the organism that grows over molluscan shells.