Carbohydrates, the most abundant biomolecules on earth, are produced by
(a) some bacteria , algae , and green plant cells
(b) Fungi , algae , and green plant cells
(c) All bacteria , fungi , and algae
(d) Viruses , fungi , and algae

Options

A. some bacteria , algae , and green plant cells
B. Fungi , algae , and green plant cells
C. All bacteria , fungi , and algae
D. Viruses , fungi , and algae

Answer

To determine which group of organisms produces carbohydrates, we need to analyze the options provided in the question.

### Step-by-Step Solution:

1. **Understanding Carbohydrates**:
- Carbohydrates are the most abundant biomolecules on Earth. They include substances like cellulose, starch, glycogen, glucose, and fructose.
- They are primarily produced through the process of photosynthesis, where carbon dioxide (CO2) is reduced using light energy.

2. **Identifying Photosynthetic Organisms**:
- The main producers of carbohydrates are organisms that can perform photosynthesis. This includes:
- **Green Plants**: They are well-known for photosynthesis, converting CO2 and sunlight into glucose and oxygen.
- **Algae**: Similar to plants, many algae can also photosynthesize and produce carbohydrates.
- **Certain Bacteria**: Some bacteria, such as cyanobacteria, are capable of photosynthesis and contribute to carbohydrate production.

3. **Evaluating the Options**:
- **Option A**: Some bacteria, algae, and green plant cells.
- This option includes organisms that can produce carbohydrates through photosynthesis.
- **Option B**: Fungi, algae, and green plant cells.
- Fungi do not perform photosynthesis; they obtain nutrients through absorption.
- **Option C**: All bacteria, fungi, and algae.
- Not all bacteria and fungi can produce carbohydrates; fungi cannot photosynthesize.
- **Option D**: Viruses, fungi, and algae.
- Viruses do not produce carbohydrates, and fungi cannot photosynthesize.

4. **Conclusion**:
- The correct answer is **(a) some bacteria, algae, and green plant cells**. This option includes organisms that are capable of producing carbohydrates through photosynthesis.

### Final Answer:
**(a) some bacteria, algae, and green plant cells**