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Glossary
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Plant life in the ocean  
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Ocean colour

Light and photosynthesis

Light zones in the ocean

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  • Plants in the ocean produce over half the world's oxygen.

  • The most important plants in the ocean are too small to be seen without a microscope.

  • They float near the surface and drift with the currents, so they have been named phytoplankton (phyto=plant, plankton=drifter).

  • Phytoplankton are the 'grass' of the sea. Where they grow there is food for marine animals.

  • Ocean colour tells you how much phytoplankton there is in the water.

Phytoplankton
Contact:
o4s@noc.soton.ac.uk
Last update:
17 February 2009
National Oceanography Centre
Approved by Schoolzones team of independent education reviewers