What is the effect of excess water on plants?

What is the effect of excess water on plants?

• A. Root oxygen loss → decline or death
• B. Increased drought tolerance
• C. Stronger root mass
• D. Less disease

Answer: (A)

When soil is oversaturated with water, air spaces in the soil are filled with water, cutting off the oxygen supply to roots. Roots rely on oxygen to respire and generate energy; in flooded soil, oxygen diffusion is limited, causing hypoxia. Without enough oxygen, root cells can’t produce enough ATP and may die, so the plant can’t absorb water and nutrients effectively. This leads to reduced growth, wilting, and, if the condition persists, plant decline or death. Wet conditions also favor root-damaging pathogens, further contributing to decline. So the main effect of excess water is loss of root oxygen, which drives the decline or death of the plant. Increased drought tolerance wouldn’t occur with waterlogged conditions, a stronger root mass is unlikely under stress, and disease is typically more common—not less—in overly wet soils.

When soil is oversaturated with water, air spaces in the soil are filled with water, cutting off the oxygen supply to roots. Roots rely on oxygen to respire and generate energy; in flooded soil, oxygen diffusion is limited, causing hypoxia. Without enough oxygen, root cells can’t produce enough ATP and may die, so the plant can’t absorb water and nutrients effectively. This leads to reduced growth, wilting, and, if the condition persists, plant decline or death. Wet conditions also favor root-damaging pathogens, further contributing to decline. So the main effect of excess water is loss of root oxygen, which drives the decline or death of the plant. Increased drought tolerance wouldn’t occur with waterlogged conditions, a stronger root mass is unlikely under stress, and disease is typically more common—not less—in overly wet soils.