Day 12, 13 & 14 Ecology

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition

• nitrogen fixation

• ammonia

• denitrification

The place where an organism lives in order to obtain its food, water, and shelter.

• species
• habitat
• niche
• community

Nitrogen fixation...

• animals eat the plants and other animals that contain nitrogen and release it through their waste

• Bacteria in the soil and lightning in the atmosphere “fix” the nitrogen

• Once in the ground, bacteria in the soil also nitrify the nitrogen

• plants absorb nitrogen through their roots and return it back to the atmosphere

How much energy is available to be passed up to the next level in an ecosystem?

• 100%
• 10%
• 50%
• 75%

The role or job of an organism in its environment.

• habitat

• niche

• community

• species

A correct path that nitrogen could take would be

• air -> animals -> plants -> bacteria

• animals -> air -> bacteria -> plants

• bacteria -> air -> plants -> animals

• air -> bacteria -> plants -> animals

Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

What would happen to the bird if the green fish died out?

• the bird population would grow

• the bird population would die out

• the smaller fish will die out

Which level has the most energy available?

• producer
• primary consumer
• secondary consumer
• tertiary consumer

Anything that prevents a population from growing too large.

• Biotic Factor

• Limiting Factor

• Abiotic Factor

• Ecosystem