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GCSE BIOLOGY - DIFFUSION AND ACTIVE TRANSPORT

Across
The spreading out of particles from an area of high concentration to an area of low concentration.
A structure in the leaves of plants which is adapted for efficient gas exchange.
The movement of particles against a concentration gradient. Particles move from an area of low concentration to an area of high concentration (two words).
A gas exchange organ in animals.
The independent variable in the investigation of the effect of sugar solutions in plant cells (two words).
The dependent variable in the investigation of the effect of sugar solutions in plant cells (two words).
A gas exchange organ in fish. Oxygen diffuses into these from the water and carbon dioxide diffuses out.
Down
These organisms have a small surface area to volume ratio for gas exchange.
Something in an organism for moving materials such as gases and dissolved substances (two words).
Hair like structures in the small intestine which provide a large surface area for efficient gas exchange
These organisms have a large surface area to volume ratio for efficient gas exchange (two words).
The movement of water from an area of high concentration to an area of low concentration.
A structure found in the lungs which provides a large surface area, a good blood supply and thin walls for efficient gas exchange.
Required for active transport.