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B1 Week 1.1

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by

Sara Kaikkonen

on 1 September 2015

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Transcript of B1 Week 1.1

B1 Week 1.1
Energy and Biomass
in Food Chains

Keywords
Producers - Organism that makes it's own food (plant)
Primary consumers - Herbivores that eat plant material
Secondary consumers - Animals that usually eat animal material (the primary consumer)
Tertiary consumers - Animals that usually eat animal material (the secondary consumer)
Predators - Kill for food
Prey - animals that predators feed on
Scavengers - feed on dead animals
Decomposers - feed on dead and decaying organisms
Trophic level - position in a food chain
Pyramid of Numbers
vs Biomass
Pyramid of Biomass
Example pyramid of biomass
What happens to the energy as it transfers out at each trophic level?
Food chains - what do the arrows mean?
Intensive Farming
The producers - Photosynthesis
Respiration - Releasing Energy from Glucose
Can you remember the word equation?

Can you remember the symbol equation?

Where in the cell does respiration happen?

Remember - respiration happens in animals AND plants and is not to be confused with breathing.
Can you remember the word equation?

Can you remember the symbol equation?

Where in a plant cell does photosynthesis happen?

What green pigment is needed for photosynthesis?

Conditions needed for Photosynthesis
Energy
Solar radiation (from the sun) is the source of energy for living organisms

Green plants and algae use PHOTOSYNTHESIS to capture this energy and to store energy in their cells
A more accurate representation of energy transfer than pyramids of numbers
Biomass is the mass of living material multiplied by the number of organisms
The biomass is always LESS in the next tropic level than the one below (pyramid shape)
Only a small proportion of biomass is passed on to the next trophic level
In your exam you will be asked to draw pyramids of BIOMASS (not number)
Drawing pyramids of biomass
Must be drawn to scale and bars the same height
Always a pyramid shape
Each bar labelled with the name of the organism
Do not actually draw the organisms
Complete the practice pyramid on your placemat
Representation of feeding relationships between organisms
Arrows show movement of energy and biomass
Arrows point in the direction of energy transfer
Shortening the food chain means less energy transferred out
Warm surroundings mean animals use less heat energy to keep warm
Small cages - less energy wasted through movement
Minimise pests and weeds so that more crops are produced because they are not eaten
What are the advantages and disadvantages of intensive farming?
Video clips about intensive farming
Jamie Oliver doesn't like battery hens


Countryfile discusses advantages and disadvantages of intensive farming (10 minute video to watch at home)
Carbon dioxide
Water
Light energy
Optimum temperature
Pyramids of Numbers and Biomass video
Full transcript