The correct option is 1 and 2 only.
Explanation
The Green Revolution in Pakistan involved the introduction of high-yielding varieties of seeds along with complementary inputs such as irrigation, fertilisers, and machinery, leading to selective structural changes in agriculture.
Statement-wise Analysis:
- Statement 1 - Correct. The Green Revolution encouraged mechanisation, particularly in regions that adopted high-yielding varieties and modern agricultural inputs.
- Statement 2 - Correct. Increased agricultural productivity required supporting infrastructure, leading to higher public investment in irrigation, power supply, and related facilities.
- Statement 3 - Incorrect. The Green Revolution did not cause a decline in foodgrain production; rather, it was aimed at increasing staple crop output, especially wheat and rice.
Key Takeaway: In Pakistan, the Green Revolution promoted mechanisation and public investment in agricultural infrastructure without reducing foodgrain production.