Assertion:Plastic grocery bags do not block drains during rains.
Reason:Plastic is lighter than water and hence floats over water.
Read the above assertion and reason and choose the correct option regarding it.
A.Both assertion and reason are correct and the reason is the correct explanation for assertion
B.Both assertion and reason are correct but the reason is not the correct explanation for assertion
C.The assertion is correct but the reason is incorrect
D.Both assertion and reason are incorrect

Hint: When the objects float or sink, density plays an important role. Water is denser than plastic. So it floats on it very easily. Plastics are a threat to the environment. They are non-biodegradable substances. It cannot be recycled and reused. They are one of the sources of water pollution.

Complete answer:
Plastic grocery bags are made up of polyethylene monomers. They are ubiquitous polymers. They are manufactured through polymerization. These are mainly non-biodegradable. They are used widely in our day-to-day life. Plastic is a threat to the environment.
Plastic grocery bags are used every day by billions of people around the world. They are said to be a harmful threat to the environment. When we compare the density of water and plastic, there is a big difference. We usually see that in rainy seasons plastic bags are floating on water in the sea, beaches, sewage, etc. This is because the density of plastic is very, much less than that of the water. And so when they are disposed of blindly on the ground, through rainwater they get displaced and move to different places and get accumulated on the beaches and gutters. And on roadsides, they get displaced and block the drains and gutters.
Therefore both assertion and reason are correct and the reason is the correct explanation for assertion.

So the correct option is A.

Note:
When plastics are burned they release toxic fumes. Their melting point is very low. It is estimated that plastics degrade in about a thousand years. Millions of birds and lakhs of marine mammals and sea turtles are dying because of getting entangled in plastic and eating plastics. Plastics should be replaced with other biodegradable or reusable substances like jute bags, paper bags, etc. which are good for the health as well as for the environment.