Natural Cycles Quiz

What do all organic molecules contain?

• oxygen
• water
• carbon
• nitrogen

Why do all living things need nitrogen?

• to build new cells
• to get rid of waste
• to cool them off
• to carry nutrients

Bacteria in soil change nitrogen gas into other forms

• photosynthesis
• nitrogen fixation
• carbon cycle
• nitrogen cycle

What is the process where carbon travels from the atmosphere into living organisms and the Earth, then back into the atmosphere?

• photosynthesis
• nitrogen fixation
• carbon cycle
• nitrogen cycle

The _____________ describes how nitrogen moves between the environment and living things.

• nitrogen fixation
• carbon cycle
• photosynthesis
• nitrogen cycle

Plants use carbon dioxide to make sugars during the process of ___________________________,

• photosynthesis
• carbon cycle
• nitrogen cycle
• nitrogen fixation

When transpiration occurs, water is evaporating from _______________________.

• the ground
• a lake
• plants
• a salty body of water

A substance is broken into simpler molecules

• respiration
• transportation
• combustion
• decomposition

Precipitation that is stored in the ground is called ___________.

• groundwater
• runoff
• succession
• biodiversity

The variety of species present in an area is called _____________.

• biodiversity
• runoff
• groundwater
• succession