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

Explanation:

To determine the correct adaptation, we analyze each option:

• Option 1: Xylem transports water and minerals, not sugar (phloem does that), so this is incorrect.
• Option 2: A thin cuticle would increase water loss, which is bad in dry climates, so incorrect.
• Option 3: Extensive shallow roots allow cacti to quickly absorb water from brief rainfall (since rain only penetrates a few inches), which is a key adaptation for dry climates.
• Option 4: Dermal tissue is for protection, not food storage (stem tissue is for storage), so incorrect.

Answer:

C. extensive shallow roots that absorb water (assuming the third option is labeled C; if the original options had labels like A - D, adjust accordingly. Based on the order, the third option is the correct one, so if options are A. thick xylem..., B. leaves..., C. extensive shallow..., D. more dermal..., then the answer is C. extensive shallow roots that absorb water)