Name the group of protists for each: (a) cells in sea water at night that glow, each with two…
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Name the group of protists for each:
- (a) cells in sea water at night that glow, each with two flagella lying in grooves between stiff plates
- (b) golden-brown cells in a glassy box of two halves
- (c) a green cell with no wall that keeps feeding on small organisms when its jar is kept in the dark
- (d) a slimy yellow mass that creeps over a rotting log and later makes stalked fruiting bodies with spores
Need a reminder? The key ideaShow
Kingdom Protista holds the single-celled eukaryotes. Chrysophytes (diatoms) have walls of silica in two shells and form diatomaceous earth. Dinoflagellates have cellulose plates and two flagella; red ones such as Gonyaulax cause red tides. Euglenoids have a protein pellicle, no wall, and make food in light but eat in the dark. Slime moulds are saprophytes that form a plasmodium and spores.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
(a) Plates and two flagella in furrows: dinoflagellates (the glowing one is Noctiluca).
(b) A silica wall of two shells: chrysophytes, the diatoms.
(c) No wall, a pellicle, food made in light and eaten in the dark: euglenoids.
(d) A plasmodium with fruiting bodies and spores: a slime mould.
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