science

Justus Carl Hasskarl

Justus Carl Hasskarl is a science 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 Justus Carl Hasskarl rather than just read about it. In short: Justus Carl Hasskarl (6 December 1811 – 5 January 1894) was a German explorer and botanist specializing in pteridophytes, bryophytes and spermatophytes. Biography Justus Carl Hasskarl was born in Kassel in the Kingdom of Westphalia.

Key takeaways

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

Reference excerpt

Justus Carl Hasskarl (6 December 1811 – 5 January 1894) was a German explorer and botanist specializing in pteridophytes, bryophytes and spermatophytes.

Biography Justus Carl Hasskarl was born in Kassel in the Kingdom of Westphalia. In his earlier life he studied at a plant nursery in Poppelsdorf in 1827. In 1834 he studied natural history while at the same time preparing himself for an expedition to the tropics. In 1836, he traveled to Java and tried to make a living through his knowledge in physics and medicine, with little success. Subsequently, he sent a request to the governor general to work in the National Botanical Garden and a year later he was appointed assistant curator. With director Johannes Elias Teijsmann, they rearranged their crops to taxonomic families, which would result in the displacement of many specimens in the botanical garden. Together they organized expeditions to various parts of modern Indonesia and expand the number of plants collection in the Botanic Garden. Hasskarl also proposed starting a library (Bibliotheca Bogoriensis) which was opened in 1842 and Herbarium Bogoriense in 1844. In 1852, the Netherlands government sent him to Lima and in early 1853, Justus made an expedition to the interior of Peru and even reaching the eastern border of Lake Titicaca, where he gathered Cinchona trees for Malaria treatment. In 1854 he sent his collections of seeds and specimens back to the Netherlands and introduced Cinchona trees to Java, the extract of the tree would later be used to make quinine. However, due to his worsening health he had to return to Netherlands in 1856. Later he participated in examining and describe the Commelinaceae of Georg August Schweinfurth's Abyssinian plant collections and also worked on several plant families, such as Cyathea junghuhniana in Leiden. In 1855 he became a member of the Royal Netherlands Academy of Arts and Sciences. He resigned in 1859. The genus Hasskarlia Baill. in the family Euphorbiaceae is named in his honor.

See also List of botanists by author abbreviation

References

External links Data related to Justus Carl Hasskarl at Wikispecies

Illustrations

Worked examples

Example 1 — a first encounter with Justus Carl Hasskarl

Start with the simplest possible case. Write down what Justus Carl Hasskarl claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Justus Carl Hasskarl 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 Justus Carl Hasskarl 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 Justus Carl Hasskarl

In research: Justus Carl Hasskarl appears in science 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 Justus Carl Hasskarl 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: Justus Carl Hasskarl is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1811 births, 1894 deaths, 19th-century German botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Justus Carl Hasskarl 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 Justus Carl Hasskarl in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Justus Carl Hasskarl 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.
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Frequently asked questions

What is Justus Carl Hasskarl in simple terms?

Justus Carl Hasskarl (6 December 1811 – 5 January 1894) was a German explorer and botanist specializing in pteridophytes, bryophytes and spermatophytes. Biography Justus Carl Hasskarl was born in Kassel in the Kingdom of Westphalia.

Why does Justus Carl Hasskarl matter?

Because it connects several science 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 Justus Carl Hasskarl?

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 Justus Carl Hasskarl.