B2

The flashcards below were created by user spacenut on FreezingBlue Flashcards.

What is the artificial classification system?

It's based on one or two characteristics that make identification easier, e.g birds that always live near the sea are called seabirds.
What is a species?

A group of organisms that can interbreed to produce fertile offspring
What is some energy at each trophic level transferred to?

Less useful forms such as heat from respiration, egestion and excretion
What is a trophic level?

A level of a food chain
What do decomposers do?

Convert proteins and Urea into ammonia
What do Nitrifying bacteria do?

They convert ammonia to nitrates
What do denitryfying bacteria do?

Convert nitrates to nitrogen gas
Where are Nitrogen fixing bacteria found?

In the root nodules
Why is a growth in population happening?

The birth rate is exceeding death rate
What does the recycling of carbon involve?
- Photosynthesis
- Feeding
- Respiration
- Decomposition
Why are food chains limited to about four levels?

The energy would run out if the food chain lasted longer
How can you work out the efficiency of energy transfer between trophic levels?

Energy used for growth / energy input
What is a generalist?

A animal that can live in a number of habitats

Author

238894

Card Set

Description

OCR B2 revision gateway

Updated

2013-10-07T20:05:56Z

Show Answers