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Draw a pyramid of biomass using
the following information.
Gazelles are eaten by lions.
Gazelles eat grass.
Describe the energy transfer that
takes place during photosynthesis.
What is a ‘producer’? Give 2
groups of organisms that are
producers.
What is the original
source of energy for
most food chains?
Why are heat losses greater in birds and mammals
than in reptiles and insects?
Why does the amount of biomass
decrease at each stage of a food
chain?.
Energy is ‘lost’ to the
surroundings along a food chain.
Explain how.
Name two groups of organism that
break down dead organic matter.
What conditions
increase the
speed of decay?
What is the importance of the
decay process?
Explain how the material in a fox is
returned to the environment to be used
by plants.
How does carbon dioxide in the
atmosphere become part of a
plant or alga’s biomass?
How does carbon in a plant become part of an
animal’s biomass?
.
How can humans affect the natural
balance of the carbon cycle?
Draw a pyramid of biomass using
the following information.
Gazelles are eaten by lions.
Gazelles eat grass.
•1 mark shape
•1 mark labels
Describe the energy transfer that
takes place during photosynthesis.
Light energy from sun converted to
chemical energy in plant / algal
cells
What is a ‘producer’? Give 2
groups of organisms that are
producers.
•Organism that makes its own
food
•Green plants
•Algae
What is the original
source of energy for
most food chains?
The sun
Why are heat losses greater in birds and mammals
than in reptiles and insects?
Birds and mammals are warm blooded so have greater
respiratory rates to release heat to keep them warm.
Reptiles and insects are cold blooded so keep warm by
basking in the sun.
Why does the amount of biomass
decrease at each stage of a food
chain?.
• CO2 is lost in respiration
• Parts of an organism may be inedible
• Biomass is lost in faeces and urine
• Some organisms die and are eaten by
microbes instead
Explain how the material in a fox is
returned to the environment to be used
by plants.
• Fox respires – releases CO2 for use
in photosynthesis
• Fox dies – broken down by
microoganisms and detrivores
• Decomposers respire to release CO2
for use in photosynthesis
• Nutrients also released into the soil
– absorbed by plant roots
Energy is ‘lost’ to the
surroundings along a food chain.
Explain how.
• Heat energy released in
respiration
• Faeces and urine
• Used in repair processes
• Organism dies and energy
passes to microbes
• Used in movement
How does carbon dioxide in the
atmosphere become part of a
plant or alga’s biomass?
Photosynthesis converts it into
glucose which can then be
turned into other
carbohydrates, fats and
proteins
Name two groups of organism that
break down dead organic matter.
•Microorganisms
•Detrivores
What is the importance of the
decay process?
Allows nutrient to be recycled –
releases substances that plants
need to grow.
What conditions
increase the
speed of decay?
Warm
Moist
Aerobic
How does carbon in a plant become part of an
animal’s biomass?
Animals eat the plants – carbon becomes part of
fats and proteins.
How can humans affect the natural
balance of the carbon cycle?
Combustion of fossil fuels releases CO2