[Campbell Biology P.846] According to the provided text, which of the following factors can ... | Practice Question

According to the provided text, which of the following factors can influence the stomatal density of a plant?

  • A: Genetic makeup and atmospheric CO2 levels.
  • B: Only the amount of sunlight received by the plant.
  • C: Primarily the plant's age, with older plants always having higher density.
  • D: The presence of pathogens, leading to reduced stomatal numbers.

Explanation

The text states that 'Stomatal density can be under both genetic and environmental control.' It further elaborates that 'Low CO2 levels during leaf development, for example, lead to increased stomatal densities.' This directly supports genetic makeup and atmospheric CO2 levels as influencing factors.