Question

Cacti typically grow in very dry climates with infrequent rainfall. When it does rain, the rain usually only penetrates a few inches into the soil. Which adaptation is most likely to help a cactus survive in the dry climate?
thick xylem tissue to transport sugar
leaves that have a thin cuticle
extensive shallow roots that absorb water
more dermal tissue for food storage

Answer 1

extensive shallow roots that absorb water

Explanation: Rain only moistens the top few inches of soil, so widespread shallow roots let cacti quickly take up that water. The other choices are incorrect or maladaptive (xylem doesn't transport sugar, a thin cuticle increases water loss, and dermal tissue isn't for storage).