How does the cactus survive in the desert? Why can the cactus survive in the desert?
How does the cactus survive in the desert? Why can the cactus survive in the desert? Cacti like to grow in arid deserts. In the dry environment, the cactus gradually formed its own unique drought-resistant characteristics: the stem is thick and succulent, and the developed parenchyma cells are good at storing water; the epidermis of the stem is covered by thick and hard wax or dense villi, so as to avoid and reduce sunlight and reduce water evaporation.
Cactus has a large root system, strong ability to absorb water, and is good at collecting trace amounts of water. In case of rain, it will grow many new roots on the surface and absorb a lot of water. The big root of the cactus is protected by thick cork tissue and can live tenaciously on the hot sand without dying. Some big cacti can live for hundreds of years.
Cactus is the general name of cactus plants, a total of more than 2000 species, there are palm-shaped, spherical, cylindrical and other forms.
From the appearance, you can see the cactus's huge stems and needle-pointed leaves, which also evolved to reduce water loss. Most of the stem of cactus is composed of storage cells, which contain mucous substances, which can protect the plant from water loss. The stem of cactus is the main organ for producing and storing nutrients. Cactus leaves because of its small area to avoid a large amount of water evaporation through the stomata on the leaves, if the cactus leaves and ordinary plant leaves, it will lose a lot of water, so that it can not survive. Therefore, the thorns on the cactus are also for the needs of survival.
There are other reasons why cactus can survive in the desert.
1. The leaves degenerated into needles, mainly to reduce water evaporation and improve the viability of cactus in the desert.
two。 Most of the stem is composed of thin-walled storage cells, which contain mucous substances, which can protect the plant from water loss.
3. Strong and developed roots, lateral roots extend far, distributed in the shallow layer of the soil, some species of roots can extend 30 meters, which is also a kind of adaptation to arid habitats.
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Why is the flowering time so short?
flowering phenomenon. Epiphyllum belongs to the cactus family. It and most members of the family have a characteristic, that is, the flowering time is very short. Especially epiphyllum, a flower from opening to withering, only four or five hours, and always love to open in the middle of the night, so it
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Why does the cactus grow stabbing? Why can cactus protect against radiation?
The cactus is loved by everyone because it can protect against radiation, but it is distressed because the long thorn is easy to be stabbed, why does the cactus grow stabbing? Why can cactus protect against radiation? Why cactus thorns are actually evolved from leaves, because
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