
1) Diatom
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https://www.crosswordclues.com/clue/phytoplankton

1) Flora 2) Mainly unicellular algae 3) Plant 4) Plant life
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https://www.crosswordclues.com/clue/phytoplankton

Phytoplankton ən are the autotrophic components of the plankton community and a key factor of oceans, seas and freshwater basins ecosystems. The name comes from the Greek words φυτόν (phyton), meaning `plant`, and πλαγκτός (planktos), meaning `wanderer` or `drifter`. Most phytoplankton are too small to be individually seen with...
Found on
http://en.wikipedia.org/wiki/Phytoplankton

a flora of freely floating, often minute organisms that drift with water currents. Like land vegetation, phytoplankton uses carbon dioxide, releases ... [14 related articles]
Found on
http://www.britannica.com/eb/a-z/p/63

Algae, microscopic single-celled plants that float in the surface waters of the sea, lakes and rivers. In the ocean they constitute the bottom of the marine food chain. They have been called the pasture of the sea. Like plants on land, they use sunlight
Found on
http://www.chemicalglossary.net/definition/1298-Phytoplankton

floating microscopic plants that obtain their energetic requirements through photosynthesis.
Found on
http://www.coml.org/edu/glossary/g1.htm

Phytoplankton bloom off Vancouver Island Credit: NASA Free-floating, oceanic plants life as opposed to zooplankton, the free-floating animal life, which feed on phytoplankton. Most of the organisms are microscopic, such as diatoms and dinoflagellates. Phytoplankton are the 'producers' of the oc...
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http://www.daviddarling.info/encyclopedia/P/phytoplankton.html

That portion of the plankton community in a body of water made up of tiny plants (e.g., algae and diatoms).
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http://www.encyclo.co.uk/local/20130

the microscopic plant component of plankton.
Found on
http://www.encyclo.co.uk/local/20740

Small (often microscopic) aquatic plants suspended in water. ... (09 Oct 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

Microscopic floating plants, mainly algae, that live suspended in bodies of water and that drift about because they cannot move by themselves or because they are too small or too weak to swim effectively against a current.
Found on
http://www.encyclo.co.uk/local/21804

Plant portion of the plankton; the plant community in marine and freshwater situations which floats free in the water and contains many species of algae and diatoms.
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http://www.encyclo.co.uk/visitor-contributions.php

Microscopic aquatic organisms that, like plants, use photosynthesis to capture and harness solar energy; term is primarily used in ecology.
Found on
http://www.fossilmall.com/Science/Glossary.htm

Small photosynthetic organisms, mostly algae and bacteria, found inhabiting aquatic ecosystems. Also see plankton and zooplankton.
Found on
http://www.physicalgeography.net/physgeoglos/p.html

phytoplankton, phytoplankters, phytoplanktonic Planktonic plant life; typically comprising suspended microscopic algai cells such as diatoms (unicellular organisms) and desmids. The phytoplankton consist of small plants having very limited powers of locomotion or no movement at all. They are mostly subject to distribution by water movements and th...
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http://www.wordinfo.info/words/index/info/view_unit/1663/15

Microscopic plants and algae that float freely in aquatic environments; phytoplankton make up the “plant” portion of plankton.
Found on
https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter

photosynthetic plankton
Found on
https://courses.lumenlearning.com/microbiology/chapter/glossary/

one celled plants life in the ocean
Found on
https://sciencetrek.org/sciencetrek/topics/oceans/glossary.cfm

That portion of the plankton community comprised of tiny plants; e.g. algae, diatoms.
Found on
https://www.encyclo.co.uk/local/20094

That portion of the plankton community comprised of tiny plants (e.g., algae and diatoms).
Found on
https://www.encyclo.co.uk/local/20128

small floating plants such as diatoms.
Found on
https://www.encyclo.co.uk/local/20501
noun photosynthetic or plant constituent of plankton; mainly unicellular algae
Found on
https://www.encyclo.co.uk/local/20974

small or microscopic photosynthetic organisms that float or drift in great numbers in fresh or salt water near the surface and are the base of the ocean food chain
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https://www.encyclo.co.uk/local/21343

Microscopic organisms (single-celled plants, bacteria, and protists) capable of photosynthesis. Phytoplankton are found in oceans, seas, and freshwater, and are an essential component of aquatic ecosystems.
Found on
https://www.globalchange.gov/climate-change/glossary

The microscopic plant component of plankton.
Found on
https://www.sustainweb.org/goodcatch/glossary_of_seafood_terms/
No exact match found.