[Campbell Biology P.1232] Based on the provided text and Figure 52.17, which of the following... | Practice Question

Based on the provided text and Figure 52.17, which of the following factors contribute to limiting the geographic distribution of saguaro cacti? Select all that apply

  • A: Freezing temperatures below -4°C (25°F).
  • B: Lack of sufficient consecutive years of moist conditions for seedling survival.
  • C: Predation by grazers such as goats on seedlings.
  • D: Consumption of saguaro flowers by bats.
  • E: Bacterial diseases affecting saguaros.

Explanation

The text explicitly states that freezing temperatures below -4°C 25°F and the need for consecutive moist years for seedling survival are abiotic factors limiting saguaro distribution. Biotic factors mentioned include predation by mice and grazers like goats on seedlings, and vulnerability to bacterial diseases. Bats are described as pollinators, which facilitate, rather than limit, distribution.