reduced biochemical activities
enhanced chemical activities
enhanced microbial activities
reduced phototropic activities
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The correct answer is:
A. Reduced biochemical activities
Explanation:
During a drought, plants experience water stress, leading to:
Reduced photosynthesis (less water for making glucose)
Slower enzymatic reactions (biochemical processes depend on water)
Stunted growth (cells cannot expand properly)
Wilting and leaf drop (to reduce water loss)
Why Other Options Are Incorrect:
B. Enhanced chemical activities 
– Water stress slows down chemical reactions instead of increasing them.
C. Enhanced microbial activities – Drought conditions often reduce microbial activity, as many microbes need moisture to survive.
D. Reduced phototropic activities – Plants still respond to light (phototropism), but growth itself is reduced due to water shortage.
Thus, the correct answer is:
A. Reduced biochemical activities
