RISE Science Grade 4 Practice Questions - RISE Science - Grade 4 Exam

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A student visiting St. George, Utah, notices that prickly pear cactus plants have thick, fleshy stems covered with a thick waxy outer layer and sharp spines instead of wide green leaves. How do these external structures help the cactus survive in the dry desert environment?

They allow the plant to absorb large amounts of snow during winter storms. They help the plant store water, reduce water loss, and protect it from animals. They attract plant-eating animals so the cactus can spread its roots faster. They keep the cactus shaded so it never needs sunlight to grow.

Correct Answer:

They help the plant store water, reduce water loss, and protect it from animals.

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