biology

Wilhem de Haan

Wilhem de Haan 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 Wilhem de Haan rather than just read about it. In short: Wilhem de Haan (7 February 1801 in Amsterdam – 15 April 1855 in Leiden) was a Dutch zoologist. He specialised in the study of insects and crustaceans, including aquatic arthropods, and was the first keeper of invertebrates at the Rijksmuseum in Leiden, now Naturalis.

Key takeaways

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

Reference excerpt

Wilhem de Haan (7 February 1801 in Amsterdam – 15 April 1855 in Leiden) was a Dutch zoologist. He specialised in the study of insects and crustaceans, including aquatic arthropods, and was the first keeper of invertebrates at the Rijksmuseum in Leiden, now Naturalis. He was forced to retire in 1846, when he was partially paralysed by a spinal disease. He was responsible for the invertebrate volume of Siebold's Fauna Japonica, which was published in 1833, and introduced the western world for the first time to Japanese wildlife. He named a great many new taxa, and several taxa are named in his honour. He published significant work on both mantids and phasmids (1842).

References de Haan, W. Bijdragen tot de Kennis Orthoptera. in C.J. Temminck, Verhandelingen over de natuurlijke Geschiedenis der Nederlandsche overzeesche Bezittingen. volume 2.(1842) W. Vrolik (1855). "Levensberigt van Wilhem de Haan". Verslagen en Mededeelingen (in Dutch). 3. Amsterdam: Koninklijke Akademie van Wetenschappen: 399–408.

External links Fauna Japonica online Archived 2016-03-03 at the Wayback Machine – de Haan's work begins on the 36th page.

Illustrations

Worked examples

Example 1 — a first encounter with Wilhem de Haan

Start with the simplest possible case. Write down what Wilhem de Haan 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 Wilhem de Haan 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 Wilhem de Haan 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 Wilhem de Haan

In research: Wilhem de Haan 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 Wilhem de Haan 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: Wilhem de Haan is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1801 births, 1855 deaths, Dutch biologist stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Wilhem de Haan 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 Wilhem de Haan in 20 minutes

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

Frequently asked questions

What is Wilhem de Haan in simple terms?

Why does Wilhem de Haan 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 Wilhem de Haan?

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 Wilhem de Haan.