NTA Environmental Science 1

Question 1

Which greenhouse gas is most responsible for recent human-caused climate change?

Accepted Answer

Carbon dioxide (CO₂)

Answer

CO₂ is the primary greenhouse gas driving recent climate change due to fossil fuel combustion and deforestation.

Question 2

The ozone layer, which protects Earth from ultraviolet radiation, is located in the:

Accepted Answer

Stratosphere

Answer

The ozone layer is located in the stratosphere, approximately 15–35 km above Earth's surface.

Question 3

What is biodiversity?

Accepted Answer

The variety of life forms in a given area

Answer

Biodiversity refers to the variety of all life forms, including species, genes, and ecosystems, in a given area.

Question 4

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Solar energy is renewable because it is continuously replenished by the sun without depletion.

Question 5

The process by which nitrogen is converted from the atmosphere into a usable form for plants is called:

Accepted Answer

Nitrogen fixation

Answer

Nitrogen fixation converts atmospheric N₂ into ammonia (NH₃) by bacteria, making it available to plants.

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