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C4-cycle was discovered by

1. Hatch and Slack
2. Calvin
3. Hill
4. Arnon

Correct answer: Hatch and Slack

Solution

The C4 cycle is also called the Hatch-Slack pathway, named after the scientists who discovered and described it. Calvin is linked to the C3 cycle, while Hill and Arnon are known for work on photosynthesis reactions, not the C4 pathway.

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