Punjab’s traditional agroforestry systems combine:

The correct answer is: a) Trees with crops.

Punjab’s traditional agroforestry systems combine trees with crops. This type of system is known as silvipastoral agroforestry. It is a type of agroforestry that involves the integration of trees, shrubs, and herbaceous plants with livestock. The trees provide shade and shelter for the livestock, and the livestock help to fertilize the soil and control pests.

Option b) is incorrect because it does not include crops. Option c) is incorrect because it does not include livestock. Option d) is incorrect because it does not include trees.