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B2 Topic 2 Organisms and Energy

Respiration: this is the process used by all living organisms to release energy from organic molecules. This
energy is used for:
o Building up larger molecules like proteins
o contract muscles (exercise)
o maintain a steady body temperature
Respiration is the process of…

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Anaerobic respiration

As you work harder your need for energy increases and thus you respire more. During exercise, muscles use
up oxygen and glucose very quickly so the blood supply to the muscles must increase (as that carries glucose
and oxygen).
The amount of blood circulated by the heart depends…

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o The cuticle protects the leaf with its wax but it doesn't block out sunlight.

Limiting factors

Many factors affect the rate of photosynthesis: the concentration of carbon dioxide, light intensity,
temperature and water availability.
The rate of reaction varies, dependent upon the conditions. These conditions are known as limiting…

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Root hair cells are found on the surface of plant roots. They have millions of long thin extensions which reach
into the surrounding soil to get all the mineral salts and water possible.
They take in water by osmosis. This gives the plant a big surface area for absorbing water…

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This is used to catch small invertebrates through an inlet tube by sucking sharply on a second tube connected
to the container.

Sweep net

This is used for catching insects in long grass. It is a net lined with strong cloth.
It should be quickly swept through the grass…


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