The Biosphere Quiz

The Biosphere

• The biosphere is the global sum of all ecosystems on Earth, encompassing all living organisms and their environments.

Alternative Term

• The term "ecosphere" is another name for the biosphere.

Closed System

• The biosphere is considered a closed system in terms of matter, meaning that matter is recycled and reused within the system.

Energy Source

• The main source of energy for the biosphere is solar energy from the sun.

Evolution

• The biosphere is postulated to have evolved from a primordial soup of organic molecules.

Nitrogen Cycle

• Nitrogen fixation is the process that involves the conversion of atmospheric nitrogen into a form that can be used by plants.

Nitrogen Source

• The largest source of nitrogen on Earth is the atmosphere, which is composed of about 78% nitrogen gas.

Nitrogen Availability

• Nitrogen availability is important for ecosystems because it is a essential nutrient for plant growth and development.

Human Impact

• The human activity that has significantly impacted the global nitrogen cycle is the widescale use of synthetic fertilizers in agriculture.

Atmospheric Nitrogen

• Atmospheric nitrogen is not readily available for biological use because it is in the form of nitrogen gas (N2), which is inaccessible to most living organisms.