biology

Sterna

Sterna is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sterna rather than just read about it. In short: Sterna is a genus of terns in the bird family Laridae. The genus used to encompass most "white" terns indiscriminately, but mtDNA sequence comparisons have determined that this arrangement was paraphyletic.

Key takeaways

Sterna belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sterna to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sterna from memory before moving on to harder problems.

Reference excerpt

Sterna is a genus of terns in the bird family Laridae. The genus used to encompass most "white" terns indiscriminately, but mtDNA sequence comparisons have determined that this arrangement was paraphyletic. It is now restricted to the typical medium-sized white terns with deeply forked tails, which occur near-globally, mostly in coastal regions but several also using freshwater habitats inland.

Taxonomy The genus Sterna was introduced in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae. The type species is the common tern (Sterna hirundo). Sterna is derived from Old English "stearn" which appears in the poem The Seafarer; a similar word was used to refer to terns by the Frisians.

Species The genus contains 13 species.

The following genera were formerly often included in Sterna:

Onychoprion (larger terns with white foreheads and dark backs) Sternula (small terns mostly with white foreheads) Thalasseus (large terns with crests)

References

External links Media related to Sterna at Wikimedia Commons Data related to Sterna at Wikispecies

Illustrations

Worked examples

Example 1 — a first encounter with Sterna

Start with the simplest possible case. Write down what Sterna claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sterna before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sterna ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sterna

In research: Sterna appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sterna in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sterna is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal taxa named by Carl Linnaeus, Bird genera, Charadriiformes stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Sterna outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sterna in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sterna means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sterna out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sterna in simple terms?

Why does Sterna matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sterna?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sterna.