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plankton + singular verb
此用法中 plankton 是集体名词，表示浮游生物的总称，谓语动词用单数。
Plankton is a major food source for many marine animals.
浮游生物是许多海洋动物的重要食物来源。
浮游生物
先理解核心含义，再看它在真实句子里的用法。
浮游生物
the very small plants and animals that float or drift in large numbers in fresh or salt water
Plankton is a major food source for many marine animals.
浮游生物是许多海洋动物的重要食物来源。
在水中漂浮的生物,尤其是小型和微小的生物。
Organisms, especially small and microscopic ones, that drift in water.
漂浮或漂流在淡水或海水中的小型植物和动物生物的集合
the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water
一个浮游生物个体,任何在水中漂浮的单个生物。
A plankter, any single organism that drifts in water.
The whale feeds on tiny plankton that drift near the surface.
鲸鱼以漂浮在海面附近的微小浮游生物为食。
Scientists collect plankton from the lake to study the water quality.
科学家从湖中采集浮游生物来研究水质。
A sudden change in temperature can reduce the amount of plankton in the ocean.
温度突变会减少海洋中浮游生物的数量。
此用法中 plankton 是集体名词，表示浮游生物的总称，谓语动词用单数。
Plankton is a major food source for many marine animals.
浮游生物是许多海洋动物的重要食物来源。
planktons 是 plankton 的复数形式，可用来指不同种类的浮游生物。
Some planktons glow in the dark.
有些浮游生物在黑暗中发光。
可用 a type of / a kind of 等结构说明具体种类。
This tiny plant is a type of plankton.
这种微小的植物是一种浮游生物。
Not this
A plankton is too small to see with the naked eye.
Use this
A plankton organism is too small to see with the naked eye.
plankton 是集合名词/不可数名词，指浮游生物的总体，不指单个个体；表示单个生物时应说 a plankton organism，不能在 plankton 前直接加 a。
Not this
Planktons are the base of the ocean food chain.
Use this
Plankton are the base of the ocean food chain.
plankton 是集合名词，泛指浮游生物时本身可作复数（后用 are），不需要也不应加词尾 -s；只有特指多种浮游生物种类时才可能用 planktons。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
海洋浮游生物
Marine plankton forms the base of the ocean food web.
海洋浮游生物构成了海洋食物网的基础。
淡水浮游生物
Freshwater plankton can be found in lakes and rivers.
淡水浮游生物可见于湖泊和河流中。
浮游生物大量繁殖；水华
A plankton bloom can turn the water green.
浮游生物大量繁殖会使水体变绿。
浮游生物群落
The plankton community changes with the seasons.
浮游生物群落随季节变化。
浮游生物种群
Climate change affects plankton populations worldwide.
气候变化影响全球浮游生物种群。
以浮游生物为食
Many small fish feed on plankton.
许多小鱼以浮游生物为食。
我上过大学！
In the animated series SpongeBob SquarePants, the tiny plankton villain Plankton says this when people doubt his intelligence. It has become a popular meme.
在动画片《海绵宝宝》中，小反派浮游生物痞老板在别人怀疑他智商时会说出这句话。这已成为一个流行迷因。
Use plankton naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 plankton 拆成 plank（木板）+ton（吨）：一吨小生物像木板一样漂在水面，即浮游生物。
语域：neutral 常见场景：海洋生物学、生态学、自然科普、中学生物课 该词是科学术语，但并非只用于正式场合；在科普文章、教材和日常讨论中也很常见，通常可视为中性书面语。
None of these words rhymes with /ˈplæŋktən/. Plank matches the initial /plæŋk/ but lacks the final /tən/; plant and planet share the initial /plæn/ but have different endings. Cotton, button, and mutton share the unstressed final /-tən/ and the spelling -ton but differ in the stressed vowel. A true rhyme occurs only in compounds such as zooplankton.
Dictionary facts from ECDICT, WIKTIONARY.