Extensive planting of trees to increase forest cover is called as:
Afforestation
The correct option is A.
Explanation of the correct option:
Explanation of the incorrect options:
Option B:
Agroforestry is a technologically advanced form of agriculture in which land is used to grow woody trees such as bamboo, palms, etc along with small crops to reduce soil erosion and nutrient leaching.
Option C:
Deforestation is the intentional cutting of trees from a forest to exploit the forest products or to use the land for other purposes.
Option D:
Social forestry simply refers to the proper management of forests for the benefit of the local communities.
Final answer: Extensive planting of trees to increase forest cover is called afforestation.