Concept:Wilting in plants occurs due to excessive water loss.
Explanation:Plant A is fresh and turgid, while Plant B has become wilted after seven hours.
Wilting happens when the rate of transpiration is higher than the rate of water absorption by roots.
Low humidity reduces moisture in the air, increasing water loss from leaves.
High temperature raises the rate of transpiration.
Together, these conditions cause the plant to lose more water than it can take in.
Thus, Plant B shows the effect of these environmental factors.
Answer:C. low humidity and high temperature
