Explanation

The approximate surface temperature of the Sun, also known as the photosphere,

It is around 5,800 Kelvin (5,500 degrees Celsius or 10,000 degrees Fahrenheit).

Explanation

The approximate height of Earth's atmosphere is 6,200 miles (10,000 kilometers).

This is the approximate extent of the exosphere, the outermost layer of the atmosphere, which gradually merges with space. 

Explanation

The most abundant carbohydrate in nature is cellulose

It is a structural polysaccharide that forms the cell walls of plants and is found in vast quantities throughout the plant kingdom. 

Explanation

Greenhouses are mainly made of glass to allow sunlight to enter and trap heat inside for plant growth.

The glass panels create a warm, controlled environment ideal for cultivating plants year-round.

Explanation

A point source of pollution refers to a fixed or stationary location, like a factory chimney or wastewater outlet.

It contrasts with mobile sources (like vehicles) or diffuse sources (like agricultural runoff).

Explanation

Climate change leads to more frequent and intense floods, droughts, heatwaves, and glacial melting in Pakistan.

These events severely impact agriculture, water resources, and human health.

It posing a major threat to the country’s economy and livelihoods.

Explanation

Carbon dioxide (CO₂) is a major greenhouse gas that helps trap heat in the Earth’s atmosphere.

It plays a key role in maintaining Earth’s temperature but excess CO₂ leads to global warming.

Explanation

The greenhouse effect occurs when gases like CO₂ and methane trap heat from the sun in the Earth's atmosphere.

This trapped heat keeps the planet warm enough to support life but contributes to global warming when intensified.

Explanation

• The greenhouse effect is an environmental problem caused by the increasing amount of carbon dioxide (CO2) in the atmosphere.
• Primarily due to human activities such as burning fossil fuels, deforestation, and land-use changes.
• This excess CO2 traps heat and leads to global warming and climate change.

Explanation

• A parasite is an organism that feeds and lives in or on part of another organism (host), often causing harm to the host.
• In this case, the mosquito is feeding on the human's blood, making it a parasite.