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They are where photosynthesis takes place, providing food for the plant. Chloroplasts contain chlorophyll pigment, which makes it green, which harvests the light needed for photosynthesis.
Answer:A dead or inactive or weak form of pathogen is introduced. (Don't say Germ)This stimulates white cells / lymphocytes / leucocytes - B and T cells (not phagocytes)to produce antibodies. Antib...
There are 3 main environmental influences; water, light and gravity. The effect of water is known as hydrotropism. This can be positive (the plant grows towards the stimulus in this case ...
A receptor detects a stimulus and generates electrical signals which are conducted by the neurones in the reflex arc. Firstly, the sensory neurone conducts the signal to the spinal cord. There is then a s...
The human circulatory system has dual / double system which means that it has higher blood pressure and a greater flow of blood to the tissues. The heart is made of specialised (cardiac) muscle cells whic...
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