biology

Hans Daniel Johan Wallengren

Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren rather than just read about it. In short: Hans Daniel Johan Wallengren (8 June 1823 – 25 October 1894) was a Swedish clergyman and entomologist. Biography He was born in Lund, Sweden.

Key takeaways

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

Reference excerpt

Hans Daniel Johan Wallengren (8 June 1823 – 25 October 1894) was a Swedish clergyman and entomologist.

Biography He was born in Lund, Sweden. Wallengren became a student at Lund University from 1842, was ordained a priest in 1847 and was appointed parish priest at Farhult and Jonstorp parishes. He undertook zoological studies with trips to Gotland and to Bohemia and Silesia, He also visited the museums in Braunschweig, Berlin and Copenhagen. Wallengren was responsible for studying and naming the butterflies collected by naturalist and explorer Johan August Wahlberg (1810–1856) at Kafferland (now Cape Province in South Africa).

Selected works Lepidoptera Scandinavioæ Rhopalocera (1853) Skandinaviens Heterocerfjärilar: I. Closterocera (1863), II. Spinnarna (1869–85) Coleophorer (1859) Fjädermott (1860) Lepidoptera nova (1861 i "Fregatten Eugenies resa omkring jorden 1851–53") Lepidoptera rhopalocera in terra Caffrorum collecta (1857) Heterocerfjärilar, samlade i kafferlandet af J.A. Wahlberg, Index specierum, Noctuarum et Geometrarum in Scandinavia hucusque detectarum (1874) Species Tortricum et Tinearum Scandinaviæ (1875)

References

External links MRN Papilio anthemenes a butterfly described by Hans Wallengren. Biography (Swedish)

Worked examples

Example 1 — a first encounter with Hans Daniel Johan Wallengren

Start with the simplest possible case. Write down what Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren

In research: Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren 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: Hans Daniel Johan Wallengren is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1823 births, 1894 deaths, 19th-century Swedish Lutheran priests, so understanding it makes those chapters shorter.
In everyday life: Look for Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hans Daniel Johan Wallengren in simple terms?

Hans Daniel Johan Wallengren (8 June 1823 – 25 October 1894) was a Swedish clergyman and entomologist. Biography He was born in Lund, Sweden.

Why does Hans Daniel Johan Wallengren 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 Hans Daniel Johan Wallengren?

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 Hans Daniel Johan Wallengren.