biology

Salvadora persica

Salvadora persica 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 Salvadora persica rather than just read about it. In short: Salvadora persica or the arak, is a small evergreen tree. Other common names include jhal, toothbrush tree, mustard tree, and peelu.

Key takeaways

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

Reference excerpt

Salvadora persica or the arak, is a small evergreen tree. Other common names include jhal, toothbrush tree, mustard tree, and peelu. Its roots and twigs called miswak are traditionally used for chewing as a toothbrush. The tree is native from the Middle East and North Africa to India.

Description Salvadora persica is a small tree or shrub with a crooked trunk, typically 6–7 metres (20–23 ft) in height. Its bark is scabrous and cracked, whitish with pendulous extremities. The root bark of the tree is similar in colour to sand, and the inner surfaces are an even lighter shade of brown. It has a pleasant fragrance, of cress or mustard, as well as a warm and pungent taste. The tree produces small red fruit, edible and juicy but pungent, in clusters, and its dark green leaves are round and fleshy.

Etymology and common names The genus was named by the French botanist, Laurent Garcin, in 1749 after a Spanish apothecary, Juan Salvador y Bosca. The type specimen was collected in Persia, giving the species name persica. Salvadora persica is commonly known as arak, toothbrush tree, or mustard tree, and has various other names in different languages, such as and jhal.

Distribution and ecology The plant is native to the Middle East, North Africa, and India, and is found on desert floodplains, riverbanks, and grassy savannahs. It has high tolerance for salty soils and can tolerate as little as 200 millimetres (8 inches) or less of mean annual rainfall, but it prefers ready access to groundwater. The fruit is eaten by birds, particularly the grey hypocolius, which disperse the seeds.

History and use Salvadora persica stick, widely known as miswak, is used for teeth cleaning throughout the Arabian Peninsula, Iranian Plateau, and wider Muslim world.

Toothbrushes made from roots and small branches of about 3–5 mm diameter have been used for over 1000 years, especially by Islamic populations in India, Arabia and Africa. Several agents occurring in the bark and wood have been suggested as aids in prevention of dental caries [cavities], such as antimicrobial agents that suppress bacterial growth and the formation of plaque. The fresh leaves can be eaten as part of a salad and are used in traditional medicine. The flowers are small and fragrant and are used as a stimulant and are mildly purgative. The berries are small and barely noticeable; they are eaten both fresh and dried. The wood can be used for charcoal and firewood. In Namibia, the mustard bush is used as drought-resistant fodder for cattle. The seeds can be used to extract a detergent oil. As of 2009, Botanic Gardens Conservation International has a total of eight Salvadora persica plants in conservation.

Illustrations

Worked examples

Example 1 — a first encounter with Salvadora persica

Start with the simplest possible case. Write down what Salvadora persica 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 Salvadora persica 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 Salvadora persica 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 Salvadora persica

In research: Salvadora persica 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 Salvadora persica 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: Salvadora persica is common in secondary-school and first-year university syllabi. It links to neighbouring topics Botanical taxa named by Carl Linnaeus, Flora of Namibia, Flora of North Africa, so understanding it makes those chapters shorter.
In everyday life: Look for Salvadora persica 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 Salvadora persica in 20 minutes

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

Frequently asked questions

What is Salvadora persica in simple terms?

Salvadora persica or the arak, is a small evergreen tree. Other common names include jhal, toothbrush tree, mustard tree, and peelu.

Why does Salvadora persica 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 Salvadora persica?

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 Salvadora persica.