Cryptochrome is

Options

A. Yellow light absorbing
B. Pigment of cryptogams
C. Red light absorbing pigment
D. Blue-light absorbing pigment.

Answer

### Step-by-Step Solution:

1. **Identify the Type of Pigment**: The question asks about Cryptochrome. It is important to recognize that Cryptochrome is a type of pigment.

2. **Determine the Light Absorption**: Cryptochrome is specifically known as a blue light-absorbing pigment. This means it primarily absorbs blue wavelengths of light.

3. **Location of Cryptochrome**: Cryptochrome is found in both plants and animals. This characteristic is significant as it highlights the broad biological relevance of this pigment.

4. **Function of Cryptochrome**: Cryptochrome plays a crucial role in the regulation of circadian rhythms in plants. Circadian rhythms are the natural, internal processes that follow a roughly 24-hour cycle, responding primarily to light and darkness.

5. **Involvement in Light-Induced Responses**: In addition to regulating circadian rhythms, Cryptochrome is also involved in various light-induced responses in plants. This means it helps plants respond to changes in light conditions.

6. **Conclusion**: Based on the information gathered, we conclude that Cryptochrome is a blue light-absorbing pigment found in both plants and animals, involved in circadian rhythms and various light-induced responses.

### Final Answer:
Cryptochrome is a blue light-absorbing pigment found in plants and animals, involved in circadian rhythms and various light-induced responses.

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