biology

Ulmus davidiana var. davidiana

Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana rather than just read about it. In short: Ulmus davidiana var. davidiana is variety of elm. The tree is restricted to the Chinese provinces of Hebei, Henan, Shaanxi and Shanxi.

Key takeaways

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

Reference excerpt

Ulmus davidiana var. davidiana is variety of elm. The tree is restricted to the Chinese provinces of Hebei, Henan, Shaanxi and Shanxi.

Description The tree has "Bark pale grey to grey. Samara densely pubescent on seed. Fl. and fr. March - May." The pubescence over the seed distinguishes var. davidiana from var. japonica.

Pests and diseases No information available, but Ulmus davidiana has a moderate, 3 out of 5 resistance.

Cultivation The tree is very rare in cultivation beyond China.

Accessions

North America U S National Arboretum [2], Washington, D.C., United States. (Listed under synonym U. davidiana var. mandshurica) Acc. nos. 76223, 68982.

Nurseries Europe Pan-global Plants [3], Frampton on Severn, Gloucestershire, UK

References

Worked examples

Example 1 — a first encounter with Ulmus davidiana var. davidiana

Start with the simplest possible case. Write down what Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana

In research: Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana 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: Ulmus davidiana var. davidiana is common in secondary-school and first-year university syllabi. It links to neighbouring topics Elm species and varieties, Flora of China, Trees of Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana in 20 minutes

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

Frequently asked questions

What is Ulmus davidiana var. davidiana in simple terms?

Ulmus davidiana var. davidiana is variety of elm. The tree is restricted to the Chinese provinces of Hebei, Henan, Shaanxi and Shanxi.

Why does Ulmus davidiana var. davidiana 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 Ulmus davidiana var. davidiana?

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 Ulmus davidiana var. davidiana.