Cycles in Nature

Organisms need this to make proteins. 

• carbon
• nitrogen
• oxygen
• ammonia

______ break down decaying matter to release the nutrients needed. 

• oxygen
• consumers
• decomposers
• sunlight

In the water cycle, rain, snow, sleet and hail are examples of this. 

• precipitation
• condensation
• transporation
• evaporation

During the water cycle, heat causes this process. 

• precipitation
• evaporation
• transpiration
• condensation

Carbon dioxide enters the atmosphere through ________. 

• evaporation
• consumption
• decomposition
• cellular respiration

Carbon is absorbed by producers through _____.

• consumption
• photosynthesis
• evaporation
• transpiration

Which of the following provides most of the energy that plants need to grow and reproduce?

• nitrogen
• oxygen
• soil
• sunlight

Some bacteria and fungi provide nutrients to soil. What is the main source of energy that bacteria and fungi need in order to provide nutrients in the soil?

• water and sugar
• sunlight and nitrogen
• dead plant and animal remains
• oxygen and carbon

Which of these biomes contains the biotic factors of very thick plant growth and many plant species that have not been identified by scientists?

• tropical rain forest
• deciduous forest
• tundra
• grassland

The organisms shown in the picture live in a biome with abiotic factors of extreme heat and dryness, sudden flash floods and cold nights. Which biome do they live in?

• forest
• fresh water
• desert
• tundra