[Campbell Biology P.45] A plant is experiencing environmental conditions of very high tempe... | Practice Question

A plant is experiencing environmental conditions of very high temperature and low atmospheric humidity. Based on the information provided, which of the following is the most likely physiological response of the plant to minimize water loss?

  • A: Stomata would open wider to increase CO2 uptake for photosynthesis.
  • B: Stomata would close to reduce transpiration.
  • C: The plant would increase water absorption by roots, keeping stomata open.
  • D: Phloem transport of sugars would increase to support wilting.

Explanation

Under CONCEPT 36.4, the text states, 'The rate of transpiration is regulated by stomata' and mentions 'Adaptations That Reduce Evaporative Water Loss.' In conditions of high temperature and low humidity, plants close their stomata to reduce the rate of transpiration, thereby conserving water and minimizing water loss.