Which of the following statements correctly defines the green revolution?

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### Explanation

- Definition: The Green Revolution refers to a set of agricultural innovations introduced around the mid-20th century (mainly from the $1960$s) that greatly increased food-grain production, especially of wheat and rice.
- Key components: high-yielding varieties (HYVs) of seeds, expanded irrigation, chemical fertilizers, pesticides, and mechanization — all aimed at raising crop yields per hectare.
- Evaluate options:
  - (1) Correct: it matches the standard definition — a strategy to produce more food grains (wheat and rice).
  - (2) Incorrect: increasing forest cover is afforestation/green cover, not the Green Revolution.
  - (3) Incorrect: using the color green for purposes is irrelevant.
  - (4) Incorrect: using herbal products is unrelated to the agricultural-yield focus of the Green Revolution.

FINAL_ANSWER: a

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