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Photosynthesis is the process by which green plants and some bacteria absorb light energy from the sun using chlorophyll (a pigment in the leaves of plants responsible for the green colour) which leads...

A reflex arc describes what controls a reflex reaction in humans. When something happens to an organism that needs a quick response a reflex action occurs. It allows the action to be 'unthinking'. A st...

You could refer to the following. Shoots grow upwards towards light (positive phototropism) and grow against the force of gravity (negative gravitropism). Roots grow with the direction of gravity (posi...

Cell walls provide plant cells with protection and structure. Protection may be from adverse conditions or from biotic threats like fungi or bacteria. The structure of the plant is dependent on the pre...

A pathogen is a microorganism that causes a disease. Pathogens spread communicable diseases meaning that they are transmitted person to person and are infectious.
Types of pathogens include bacteria,...