According to the passage, which pigment is primarily responsible for photosynthesis in algae?

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**Solution:**

1. The passage states that algae are photosynthetic organisms containing pigments that help in photosynthesis, with chlorophyll being the main pigment.

2. Other pigments mentioned, such as carotenoids and xanthophylls, serve as accessory pigments but are not the principal ones responsible for photosynthesis.

3. Melanin is unrelated to photosynthesis and is primarily found in animals for pigmentation.

Therefore, the correct answer is **chlorophyll**, as it is the primary pigment enabling photosynthesis in algae.

**Answer:** Chlorophyll

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