Which of the following are phenotypically plastic responses of plants to reduced water availability?
I. develop trichomes and produce more glucosinolate
II. close stomata in leaves
III. increase the root/shoot ratio

Question

Quizplus · Accepted Answer

I is not a phenotypically plastic response to reduced water availability. Developing trichomes and producing more glucosinolate are adaptations to deter herbivores, not a direct response to reduce water availability. 
II and III are both phenotypically plastic responses to reduce water availability. Closing stomata helps to reduce water loss through transpiration, while increasing the root/shoot ratio helps to increase water uptake and reduce water loss. Therefore, the correct answer is E) II and III only.

Which of the Following Are Phenotypically Plastic Responses of Plants