Correct Answer: Assertion is true, but the reason is false.

Solution : The correct answer is (c) Assertion is true, but the reason is false.

While horticulture does often involve the use of scientific techniques for crop production, it is not solely limited to scientific practices such as protected cultivation and precision farming. 

Horticulture encompasses a broad range of practices and techniques, including traditional methods that have been passed down through generations. While modern practices like protected cultivation and precision farming can be employed in horticulture, they are not the only methods used.

Therefore, the assertion is true, but the reason is false.