Each question in this quiz is timed.
What is an ecosystem?
All the organisms living in a particular area and all the non-living conditions
Organisms living in a community, including all the non-living conditions
There are 4 different types of bacteria involved in the nitrogen cycle. Which type of bacteria breaks down proteins and urea and turns them into ammonia?
Nitrifying Bacteria
Decomposers
Denitrifying Bacteria
Nitrogen-fixing Bacteria
What does each bar of a pyramid of biomass stand for?
the number of organisms
the mass of living material
Why is carbon monoxide poisonous?
It kills red blood cells in the body
It replaces oxygen and combines with red blood cells
What is the name of the bacteria that turns nitrates back into Nitrogen gas?
What percentage of the atmosphere is Nitrogen gas?
78%
21%
Why do plants need nitrogen?
For growth
To speed up the rate of photosynthesis
Here is a food chain: dandelion ----> rabbit ----> fox ----> flea. Which is the tertiary consumer
fox
rabbit
flea
Only 10% of energy is transferred from one trophic level to another. Why is this?
energy is lost through heat, respiration etc
Organisms can only take in a maximum of 10%
Organisms only need 10% of the energy
All the species in a food web are interdependent. This means if one species changes it doesn't affect the others.
