Answer:
The correct option is<em> A. Active transport moves substances against the concentration gradient.</em>
Explanation:
Active transport can be described as a transport mechanism in which molecules tend to move against the concentration gradient i.e from an area of lower concentration to an area of higher concentration. Energy is needed for this process to occur.
Facilitated diffusion can be described as a phenomenon is which molecules move along the concentration gradient i.e from a higher concentration to a lower concentration with the help of trans- membrane integral proteins
Answer:
The plant hormone ABA or abscisic acid is help in regulating the guard cells via its effect on osmotically changes in turgor. ABA inhibits the proton ATPase, slow down the anion channel and other influences that result in depolarization of membrane potential guard cells that leads to efflux of the K+ closure of stomatal.
Plants have feedback mechanisms that have evolved as well. In stress conditions such as drought these mechanisms involve in closing the guard cells in order to water loss through transpiration.
The answer might be extinction or genocide
Zambia
The other three are already well established.
