Biology Revision Cards

Created by: tavey.s
Created on: 30-03-17 13:57

What is Biomass?

All the organic material in an ecosystem available to an organism

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How do we measure Biomass?

Dessicate the organism using heat. Weigh the sample in regualr intervals , whe it stops losing mass and remains constant, all the water has been removed. Use dry mass comparisons and population estimates to scale it to the whole ecosystem.

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How do you calculate the amount of chemical energy stored in dry Biomass?

Calorimetry - by measuring the increase in Biomass

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How do you show the flow in energy from one organism to another?

Ecological pyramids (trophic level, energy pyramids), food chains and food webs

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Who sits at each trophic level?

Producers are the 1st trophic level, the second are primary consumers such as herbivores, secondary consumers are the 3rd.

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what are the uses of food chains?

They are single pathways of energy transfer. the arrows represent the flow of energy. However they are too simple to encompass a whole ecosystems interactions.

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What are food webs, and what is their use?

Food webs are made of many interacting food chains. They are more accurate than food chains. If one part of the food web is lost it can have consequences on the entire ecosystem.

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What can affect the size of a food web population?

Biotic factors - predators and diseases. Abiotic factors - temp, pH, water, soil nutrients and exposure to wind.

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What is Primary Productivity?

The rate at which plants convert sunlight into chemical energy is known as primary productivity.

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What are the units for Primary Productivity?

Kjm-2 year-1

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What is Gross Primary Productivity?

It is the chemical energy store in plant biomass in a given area, in a given time.

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What is the equation for net primary Productivity (NPP)?

NPP = GPP-R

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What is NPP?

The chemical energy stored in plant bioomass after respiratory losses to the environment have been taken into account.

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Other cards in this set

Card 2

Front

How do we measure Biomass?

Back

Card 3

Front

How do you calculate the amount of chemical energy stored in dry Biomass?

Back

Card 4

Front

How do you show the flow in energy from one organism to another?

Back

Card 5

Front

Who sits at each trophic level?

Back

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