Sir Isaac Newton conducted a simple experiment showing that sunlight could be separated into a spectrum of different colors by passing it through a prism.

Wavelengths of electromagnetic radiation vary from the very short wavelengths of cosmic rays to very long radio waves.

Maxwell's experiment with the prism can be explained because light bends when it passes from one transparent substance to another, from air into a quartz prism.

Albert Einstein proposed that electromagnetic radiation was composed of packets of energy, which he called quanta (singular, quantum)

The biosphere is the reason why life has become so dependent on such a limited portion of the electromagnetic spectrum

A pigment that absorbs all wavelengths of light with equal efficiency will appear red.

With an instrument called a spectrophotometer, it is possible to measure how much of each wavelength of light is absorbed by a sample of pigment.

The first scientist who conducted recorded experiments on how plants found food was Zach Schneider, a Belgian scientist who studied the soil in which plants lived.

Swiss scientist Jean Senebier first deduced that plants produced oxygen and used carbon dioxide while undergoing the process of respiration in the late eighteenth century.

Plants use a variety of pigments like chlorophyll and carotenes to absorb rays from the Sun and use their energy.

The first stage of photosynthesis is called the light reaction phase because it occurs in the thylakoid membrane and requires light to operate.

Chlorophyll, which are organelles specific to plants, are where the first steps of photosynthesis take place.

Like animals, plants rely on stores of energy-rich fats. All fats are comprised of triglycerides, which are chemical compounds made of a glycerol backbone and fatty acid chains.

Saturated fats tend to be solid at room temperature and are mainly found in products that come from animals, such as meat, butter, milk and other dairy products (as well as foods made with these ingredients).