Holdfast, stipeand frond constitute the plant body in case of

Options

A. Rhodophyceae
B. Chlorophyceae
C. Phaeophyceae
D. all of these.

Explanation

To answer the question "Holdfast, stipe, and frond constitute the plant body in case of," we can follow these steps:

### Step 1: Identify the Structures
- **Holdfast**: This structure anchors the plant to the substratum, similar to roots in higher plants.
- **Stipe**: This is the stalk-like structure that supports the frond.
- **Frond**: This is the leaf-like structure that is involved in photosynthesis.

### Step 2: Relate to Plant Groups
- These structures are characteristic of certain groups of algae, specifically the brown algae.

### Step 3: Name the Group
- The group that possesses these structures is known as **Phaeophyceae**, commonly referred to as **brown algae**.

### Step 4: Provide Examples
- Examples of brown algae include:
- **Laminaria**
- **Dictyota**
- **Fucus**

### Final Answer
Holdfast, stipe, and frond constitute the plant body in the case of **Phaeophyceae** (brown algae).

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