In which of the following groups all the organisms contain chlorophyll c

Options

A. Ectocarpus,Fucus, Sargassum,Laminaria
B. Macrocystis,Batrachospermum,Polysliphonia,Characium
C. Chlamydomonas,Asterocystis,Ulothrix,Gelidium
D. Harveyella,Chondrus,Volvox,Chlorella

Answer

To solve the question "In which of the following groups all the organisms contain chlorophyll c?", we will analyze the options provided and determine which group contains organisms that all possess chlorophyll c.

### Step-by-Step Solution:

1. **Understanding Chlorophyll Types**:
- Chlorophyll is a green pigment found in plants and algae that is essential for photosynthesis. Different types of chlorophyll are present in various groups of algae.
- Specifically, we are interested in chlorophyll c, which is found in certain types of algae.

2. **Classifying Algae**:
- Algae can be classified based on their pigments into three main groups:
- Red Algae (Rhodophyta)
- Brown Algae (Phaeophyta)
- Green Algae (Chlorophyta)

3. **Identifying Chlorophyll Presence**:
- **Red Algae**: Contains chlorophyll a and d, but does not contain chlorophyll c.
- **Brown Algae**: Contains chlorophyll a and c. This is the group we are focusing on for chlorophyll c.
- **Green Algae**: Contains chlorophyll a, but does not contain chlorophyll c.

4. **Analyzing the Options**:
- **Option 1**: Ectocarpus, Fucus, Sargassum, Laminaria - All of these are brown algae and contain chlorophyll c.
- **Option 2**: Polysiphonia - This is a red algae and does not contain chlorophyll c.
- **Option 3**: Chlamydomonas - This is a green algae and does not contain chlorophyll c.
- **Option 4**: Chondrus - This is also a red algae and does not contain chlorophyll c.

5. **Conclusion**:
- The only option where all organisms contain chlorophyll c is **Option 1** (Ectocarpus, Fucus, Sargassum, Laminaria), which are all brown algae.

### Final Answer:
**Option 1**: Ectocarpus, Fucus, Sargassum, Laminaria (All contain chlorophyll c).