A gland in the mouth which produces saliva containing the enzyme amylase.
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What is a sample size?
The size of a sample in an investigation.
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What does secreting mean?
Releasing chemicals such as hormones or enzymes.
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What is a sense organ?
A collection of special cells known as receptors which responds to changes in the surroundings (e.g. eye, ear).
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What is a sensory neuron?
A neutron which carries impulse from the sensory organs to the central nervous system (CNS).
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What is sewage?
A combination of bodily waste, waste water from homes and rainfall overflow from street drains.
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What is a sewage treatment plant?
A site where human waste is broken down using microorganisms.
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What is a sex chromosome?
A chromosome which carries the information about the sex of an individual.
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What is sexual reproduction?
Reproduction which involves the joining (fusion) of male and female gametes producing genetic variety in the offspring.
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What is a small intestine?
The region of the digestive system where most of the digestion of the food takes place.
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What is solar energy (light energy)?
Energy from the Sun or other light source.
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What is a solute?
The solid which dissolves in a solvent to form a solution.
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Wht does specialised mean?
Adapted for a particular function.
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What is speciation?
The formation of a new species.
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What is a species?
A group of organisms with many features in common which can breed successfully producing fertile offspring.
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What is a statin?
A drug which lowers the blood cholesterol levels and improves the balance of HDLs to LDL.
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What is a stem cell?
An undifferentiated cell with the potential to form a wide variety of different cell types.
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What is a stent?
A metal mesh placed in the artery which is used to open up the blood vessel by the inflation of a tiny balloon.
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What is a steroid?
A drug that is used illegally by some athletes to build muscles and improve performance.
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What is stimuli?
A change in the environment that is detected by sensory receptors.
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What is stomata?
Openings in the leaves of plants (particularly the underside) which allow gases to enter and leave the leaf. They are opened and closed by the guard cell.
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What is a substrate?
The material or chemical on which an enzyme acts.
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What is sustainable food production?
Methods of producing food which can be sustained over time without destroying the fertility of the land or ocean.
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What is a synapse?
A gap between neutrons where the transmission of information is chemical rather than electrical.
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