Plants that grow and exist in deserts have highly specialized means of adapting themselves to the arid environment.

The correct answer is: D. dry

Plants that grow in deserts have highly specialized means of adapting themselves to the arid environment. They have to be able to survive in very dry conditions with little water. Some of the ways that they do this include:

• Having deep roots that can reach down to water that is deep underground.
• Having thick, waxy leaves that help to prevent water loss.
• Being able to store water in their leaves, stems, or roots.
• Being able to photosynthesize at night when it is cooler and there is less evaporation.

These adaptations allow desert plants to survive in a very harsh environment.

The other options are incorrect because:

• Unproductive does not accurately describe desert plants. While they may not produce as much food as plants in other
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  environments, they are still able to survive and reproduce.
• Useless is also an incorrect description of desert plants.
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  They may not be useful to humans in the same way that plants in other environments are, but they are still an important part of the desert ecosystem.
• Withering is not an accurate description of desert plants. While they may wilt or lose some of their leaves during periods of drought, they are able to recover and continue to grow.