Yes, ultraplankton refers to plankton that are less than 2 micrometers in size.
No, Phytoplankton is the smallest form of plankton.
UV rays affect plankton the most. They make them die.
Plankton is plural and its singular form is plankter. However, be aware that the word "plankton" is most often used in its plural as a collective noun.
Some plankton do eat algae. Phytoplankton are a form of algae, and some zooplankton are consumers of phytoplankton.
Assuming you mean a super form called Ultra Sonic, No
plankton
ultra sound machine
A planktivore is an aquaticorganismthat consumes plankton, such asthe angelfish, and Whale sharks.note: ("Plankton" is a broad term for an aquatic organism that has little tono form of locomotion.)
Ultra Large Scale Integration
Plankton because fish eat plankton, bigger predators eat fish who eat the plankton, and so on, so on.Sources: 6th grade science Textbook, notes, and test.
Ultra is typically a prefix, not a word, but is used as slang or a short form of longer words.(extremist, from ultra-nationalist)Police rounded up ultra suspects after the bombing.(ultra marathon)Running an ultra requires great endurance.(ultra-secret)British decryption of German codes in World War II was code-named Ultra.
UV (ultra violet) light