Pigments which contain oxygen and nitrogen are
(A) Phycobilins (B) Carotenes
(C) Xanthophylls (D) Chlorophylls

Options

A. A, D
B. B,C
C. A, C, D
D. D only

Answer

To determine which pigments contain both oxygen and nitrogen, let's analyze each option provided:

1. **Phycobilins (Option A)**:
- Phycobilins are pigments found in cyanobacteria and red algae. They are known for their role in capturing light energy and transferring it to chlorophyll. Phycobilins contain both nitrogen and oxygen in their structure.

2. **Carotenes (Option B)**:
- Carotenes are a type of carotenoid pigment that is primarily responsible for the red, orange, and yellow colors in many plants. They are hydrocarbons and do not contain nitrogen; they mainly consist of carbon and hydrogen.

3. **Xanthophylls (Option C)**:
- Xanthophylls are another type of carotenoid, but they contain oxygen in their structure. However, they do not contain nitrogen.

4. **Chlorophylls (Option D)**:
- Chlorophyll is the green pigment found in plants, algae, and cyanobacteria. It plays a crucial role in photosynthesis. Chlorophyll contains both nitrogen and oxygen in its molecular structure.

Now, based on the analysis:

- **Phycobilins (A)**: Contains nitrogen and oxygen.
- **Carotenes (B)**: Does not contain nitrogen.
- **Xanthophylls (C)**: Contains oxygen but not nitrogen.
- **Chlorophylls (D)**: Contains nitrogen and oxygen.

Thus, the pigments that contain both oxygen and nitrogen are **Phycobilins (A)** and **Chlorophylls (D)**.

**Final Answer**: (A) Phycobilins and (D) Chlorophylls.

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