Xerophytes have:
Correct answer: D. All (A), (B) and (C)
- A. Deep roots for water uptake
- B. Succulent stems for storage of water
- C. Few stomata to limit water loss
- D. All (A), (B) and (C)
Explanation
Xerophytes have the adaptations for reduced rate of transpiration. Many xerophytes possess small, thick leaves to limit water loss by reducing surface area proportional to the volume. Their cuticle is thick, waxy, and leathery. Stomata are on the lower surface of leaves and located in a depression. Some of the cacti, during the driest season, shed their leaves to restrict transpiration completely, thus stems are the photosynthetic organs.
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Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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