What is a weed? Detailed answer

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What is a weed? Detailed answer

Big encyclopedia for children and adults

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What is weed?

When we say "weed" we are not referring to the scientific classification of plants. It's just the way people call certain types of plants. Weeds are commonly referred to as plants that grow in places where they are not supposed to grow. The dandelion in the middle of the clearing is a weed. Dandelion grown as a medicinal plant is not a weed. Clover is not a weed in a pasture, but a weed in a flower bed.

Sometimes the same plants are weeds for some people and not for others. City people collect daisies, buttercups, bluebells and cornflowers. And the farmer, who saw the same flowers on his plot, will cry out: "Weeds!" - and fly them.\

Weeds, therefore, are plants that grow in the wrong place. Usually these plants reproduce surprisingly quickly and in large numbers. This means that weeds survive better than specially cultivated plants. Some weeds are very tall. Wild lettuce reaches 2 meters in height. Even higher is his burdock.

Some weeds, on the contrary, are very stunted and creep along the ground. Many weeds do their harmful work underground. For example, wild carrots and dandelions have long, thick roots. This helps them absorb water even during dry periods, depriving field plants of moisture.

Some plants have widely spreading roots that rush underground in different directions and give life to a large number of new plants. Weed control chemicals have been developed to help control weed growth.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why do snakes have scales?

Snakes are reptiles, and like all reptiles, they have dry, scaly skin. Relatives of snakes are lizards, alligators, crocodiles, sea and land turtles. Since there are more than 2000 species of snakes in the world, it is not surprising that they live everywhere: on earth, underground, in trees and in water, inhabiting almost all regions of our planet, with the exception of the polar regions and some islands.

As noted earlier, snakes have no legs (although pythons and boas have the remains of hind legs), and plates (or scales) located on the belly help them move. They are quite wide, and the snake moves them in such a way that the edge of the plate is repelled by some unevenness on the surface of the earth. Pushing off several plates at the same time, the snake moves forward.

All snakes, both old and young, molt periodically. Even the film covering the eyes gives way to a new one. In the process of molting, the skin of the snake is turned inside out. The snake gets rid of it by rubbing against any bumps or stones. Moulting in snakes occurs several times a year.

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