Showing posts with label Lizards. Show all posts
Showing posts with label Lizards. Show all posts

How do Animals and Plants Survive in Deserts?

            Due to the scarcity of water and extreme climatic conditions hot, dry, windy prevailing in the desert, it is very difficult for animals and plats to survive. They have to adapt themselves to the desert conditions so that they can live. Let us see what types of vegetation and animals are found there and how they survive.

Animals of Desert

            The vegetation of a desert mainly consists of thorny shrubs, cacti and palm especially dates trees. Cacti, prickly pear, saguaro, century plant etc., have adapted themselves to live in desert conditions. These plants have ways to store water in their fleshy stems. The leaves have squeezed themselves into tiny thorns to reduce the loss of water. The roots go deep into the ground and are widespread to collect every drop of water available in the soil. The stem stores the water and slowly gets thinner as the water gets used up. In some cacti, the thorns point towards the earth. The dewdrops deposited on the tips of these thorns fall to the earth and get absorbed by it. In this manner, a cactus plant manages to create moisture on the ground around it.

Plants of Desert

            Most desert animals sleep during the day to escape the high temperatures and come out at night in search of food. Some animals sleep during the hottest part of the year. There are very few animals found in deserts such as snails, pack rat, jerboa, etc. these have adapted themselves to the desert conditions. Animals such as the kangaroo rat and gerbil can survive with little or no water. Reptiles adjust their body temperatures to cope with heat ad cold. The Australia desert toad stores water in its body. Some species of lizards, ants, owls and snakes also live in desert sad adjust to desert conditions.

What is Regeneration?

            Would it not be wonderful if people who lost an arm or a leg or even a finger in an accident could simply grow another one in its place? But this does not happen in case of human beings. However, you will be surprised to know that there is some living beings in which a new limb develops at the same point from where the original limb has been lost. Development of a new body part in place of a lost one is known as regeneration.

Starfish

            If one arm of a starfish is cut off or destroyed, it is regenerated. Hydra, lizards, sponges, newts and earth worms also possess this capability of regeneration. If the tail of a lizard is cut, a new tale develops there.

            The ability of regeneration varies in different creatures. Living beings with complicated structures have lesser ability of regeneration. Man and other mammals have a complex constitution. That is why they have lesser ability of regeneration. Mammals can replace hair, nails and skin. They can also repair broken bones and other damaged tissues. In some species, new tissues grow from the surface of the wound replacing the damaged tissues. Sometimes, the tissues that an organism regenerates are different form the original ones. The regenerated structure may be smaller and weaker than the original one.

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