HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Euglena flagellate protozoa. Light micrograph of the flagellate protozoa Euglena viridis after it has been illuminated for 48 hours. This freshwater single-celled organism can either obtain energy from sunlight, via photosynthesis, or by absorbing chemicals from its surroundings. Cell organelles called chloroplasts (green) are used for photosynthesis. They are made green by the pigment chlorophyll. If there is no light E. viridis stops producing chlorophyll and loses its green colour. A sensory organ, known as the eye spot (orange) is able to perceive the intensity of light. This allows E. viridis to move, using its flagella (not seen), to the areas of most intense light. Magnification: x1800 at 10 centimetres wide.
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