why cactus babool and other desert plant can easily survive in less water
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Answer:
Desert plants have many adaptations that allow them to live with little water. Cacti only open their pores at night to exchange CO2 and O2, so they lose less water to evaporation. Most plants open their pores during the day.
Many desert plants have very thick, waxy skins to slow evaporation. The also may develop either incredibly deep root systems to search for water or have nearly all of their roots just a tiny bit below the surface to take best advantage of the smallest showers.
Cacti store water in their stems, but many other succulents store liquid in their leaves, too. They can swell to accommodate extra water when they get it in order to ride out the droughts. Some plants - lithops - take this to an extreme; they live almost completely buried with just a couple of thick, roundish leaves that have ‘windows’ of clear tissue. The sun comes through and gives the plant energy but dehydration is kept to a minimum since the plant is nearly underground. They look like pebbles until they bloom. There are many different adaptations in the plant world for surviving even the harshest habitats.
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