Biology-Unit 1 Module 2 Test

In the nitrogen cycle, bacteria and ____ convert atmospheric nitrogen into nitrogen compounds usable by plants.

• lightning

• plants

• animals

• sunlight

What is the portion of Earth that supports life?

• ecosystem

• population

• community

• biosphere

What is a network of interconnected food chains?

• trophic levels

• food pyramid

• food web

• eating web

Waht are the tiny organisms that break down and absorb nutrients from dead organisms?

• heterotrophs

• autotrophs

• scavengers

• decomposers

What is a relationship in which both species benefit?

• parasitism

• mutualism

• commensalism

• symbiosis

What is a collection of interacting populations?

• community

• species

• ecology

• trophic level

What is the replacement of species in a community as environmental conditions change?

• climax community formation

• succession

• tolerance

• optimum range

What is released at each level of a pyramid of energy?

• plants

• decomposers

• animals

• heat

What process involves the capture and conversion of nitrogen into a form useable by plants?

• phosphate cycle

• nitrogen fixation

• condensation

• denitrification

How can detritivores be beneficial to the environment?

• provide food for autotrophs

• facilitate photosynthesis in plants

• allow predation to occur

• get rid of waste and dead matter