From what is coal gas obtained?

Why should biodegradable and non-biodegradable wastes be discarded in two separate dustbins?

Which type of natural resources are forests and wildlife?

It is important to make small check dams across the flooded gullies because they
$(i)$ hold water for irrigation
$(ii)$ hold water and prevent soil erosion
$(iii)$ recharge groundwater
$(iv)$ hold water permanently

Which of the following is an endangered bird species?

Water is a valuable resource. List two ways that you would suggest every family member to save this resource.