Greenhouse Gases and Atmosphere

Carbon dioxide is the primary greenhouse gas emitted through human activities. It is a major contributor to global warming.

Carbon dioxide is the most significant greenhouse gas emitted by human activities, primarily through the burning of fossil fuels.

Carbon dioxide (CO2) is the primary greenhouse gas responsible for trapping heat in the atmosphere, contributing to the greenhouse effect.

Biogas is primarily composed of methane (typically 50-75%) and carbon dioxide.

Carbon dioxide (CO2) and methane (CH4) are the primary greenhouse gases responsible for trapping heat in the Earth's atmosphere, leading to the greenhouse effect.

During respiration, organisms break down glucose and release carbon dioxide as a byproduct, which returns carbon to the atmosphere.

Gobar gas (biogas) is produced by the anaerobic digestion of organic matter and is composed primarily of methane.

Some amount of phosphorus is returned to the earth, in the form of bird's excreta - Guano deposits (excreta of marine birds) and dead fish (around 60,000 tonnes which is less than 0.5% of phosphorus discharged from rivers)

The high concentration of CO₂ in atmosphere has been the main component of the greenhouse effect, which has caused global warming, i.e. the rise of atmospheric temperature in recent years.

This is the correct answer. Animals and humans release carbon dioxide and breathe in oxygen during the process of respiration.

Carbon dioxide is a primary greenhouse gas that traps heat in the atmosphere. Sulphur dioxide and nitric oxide are primarily associated with acid rain and smog, while ethane is a hydrocarbon fuel.

This is the correct option. The natural gas contains ethane and propane in small quantities, the major quantity being methane.

This is the correct option. Carbon dioxide is a greenhouse gas.

It is the percentage of carbon dioxide gas. The raising level of carbon dioxide and methane, in the atmosphere is the major cause for global warming. It is because of the increasing greenhouse gases, that raises the concern of melting of glaciers and elevation, in the global temperature.

This is the correct option. Carbon dioxide is useful for plants in making their food through the process of photosynthesis.