The most abundant gas in the stratosphere is:

A. Oxygen (O2)
B. Nitrogen (N2)
C. Carbon dioxide (CO2)
D. Ozone (O3)
✅ The correct answer is option B.
The atmosphere contains many gases, most in small amounts, including some pollutants and greenhouse gases. The most abundant gas in the atmosphere is nitrogen, with oxygen second. Argon, an inert gas, is the third most abundant gas in the atmosphere.

When is the World Wildlife week ?

A. First week of September
B. Last week of September
C. First week of October
D. Last week of October
✅ The correct answer is option C.
Wildlife week is celebrated all over the country in the month of October from 2nd to 8th every year with the view to preserve the fauna, i.e., the animal life of the India.

The resources that can be replaced by natural ecological cycle is called

A. Renewable
B. non-renewable
C. exhaustible
D. natural
✅ The correct answer is option A.
Renewable resources are natural resources that can be regenerated or replaced by ecological processes on a relevant timescale. They include biological resources such as biomass, plants, and animals. They also include freshwater, fresh air, soil fertility, and elements like carbon and nitrogen.

What do you call the rain that contains chemical waste and cause damage to plants and animals?

A. Smog
B. Acid rain
C. Monsoon rain
D. Seasonal rain
✅ The correct answer is option B.
The sulphur oxides (combination of sulphur and oxygen) react with the water vapour in the air to form very strong acids like sulphuric acid (h2so4). these acids fall along with the rain and hence the name acid rain. this rain is very harmful for plant and animal life.

During the afternoon the greatest temperature difference between the surface air and the air several meters above occurs on a:

A. Clear, calm afternoon
B. Clear, windy afternoon
C. Cloudy, calm afternoon
D. Cloudy, windy afternoon
✅ The correct answer is option A.
During the afternoon, the greatest temperature difference between the surface air and the air several meters above the ground occurs on a:clear, calm day.

The occurrence of pesticides like DDT in higher trophic levels is termed as

A. bioremediation
B. biomagnification
C. biological enhancement
D. biopollution
✅ The correct answer is option B.
Biomagnification, also known as bioamplification or biological magnification, is any concentration of a toxin, such as pesticides, in the tissues of tolerant organisms at successively higher levels in a food chain.