Plants in _ habitats would be expected to have evolved water-conservation traits.
a. thermoneutral b. hypoosmotic c. xeric d. mesic
The correct answer and explanation is:
The correct answer is c. xeric.
Xeric habitats are characterized by dry conditions with limited water availability, such as deserts or areas with seasonal droughts. In these environments, plants face significant challenges in conserving water to survive the harsh conditions. Over time, plants in xeric habitats have evolved a variety of specialized traits to minimize water loss and maximize water storage.
One important adaptation is the development of thick cuticles, which are waxy layers on the surface of leaves and stems that reduce water evaporation. Additionally, many xeric plants have modified leaf structures. For instance, some have small, needle-like leaves, or in some cases, leaves that are reduced to spines, like those seen in cacti. This reduces the surface area for transpiration and helps conserve water.
Another key trait is stomatal control. Many xeric plants have fewer stomata (pores on leaves) or can close them during the hottest parts of the day to prevent water loss. Some plants also exhibit CAM (Crassulacean Acid Metabolism) photosynthesis, a type of photosynthesis where stomata open at night instead of during the day to reduce water loss.
Additionally, many xeric plants are succulent, meaning they store water in their leaves, stems, or roots. This stored water can be used during dry periods when water is scarce. Some plants also have deep root systems that can access water sources deep underground, further enhancing their ability to survive in dry conditions.
Overall, the adaptations found in plants from xeric habitats help them survive and reproduce in environments where water is limited and the risk of desiccation is high.