ISEE Lower Level Reading Comprehension Quiz
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AUTHOR'S PURPOSE AND POINT OF VIEW
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How does a cactus survive in a desert with so little water? The answer lies in its amazing adaptations. Unlike most plants, cacti have thick, waxy stems that store water for long periods. This waxy coating also prevents the water inside from evaporating in the hot sun. Instead of wide leaves, which lose a lot of water to the air, most cacti have sharp spines. These spines are actually modified leaves that protect the cactus from thirsty animals and also help reduce water loss. To find what little water is available, cacti have developed two kinds of roots. A shallow, widespread network of roots just under the surface quickly soaks up any rare rainfall. In addition, a very long, thick central root called a taproot can reach deep underground to find hidden sources of water. These features working together make the cactus a master of desert survival.
The author's purpose in mentioning both shallow roots and a deep taproot is to
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