What are the effects of smoking habits for pregnant women?

Which gas is released into the atmosphere by the exhaust of supersonic jet planes?

Which of the following is a non-conventional source of energy?

Addition of phosphate fertilisers to water bodies causes

Fill in the blanks:
$(1)$ Hydrocarbon compounds are made from ........ and ........ .
$(2)$ ........ has a capacity to stop the flow of oxygen.
$(3)$ ........ is formed by attaching carbon monoxide with hemoglobin in blood.

Given below are two statements:
Statement $I$: Non-biodegradable wastes are generated by the thermal power plants.
Statement $II$: Bio-degradable detergents lead to eutrophication.
In the light of the above statements,choose the most appropriate answer from the options given below: