Why do plants in flooded areas die?

Why do plants in flooded areas die?

• A. Root rot due to lack of oxygen to roots.
• B. Overwatering causes nutrient toxicity.
• C. Excess sunlight damages leaves.
• D. Cold air suffocates roots.

Answer: (A)

When soil is flooded, the spaces between soil particles are filled with water, which greatly reduces the amount of oxygen available to roots. Plants need oxygen for cellular respiration to produce the energy required to take up water and nutrients. Without enough oxygen, root cells can’t generate energy, the roots deteriorate, and their ability to absorb water and minerals drops. This leads to wilting, nutrient deficiencies, and eventually plant death. In flooded conditions, the primary issue is the root zone becoming oxygen-starved (anoxic), though anaerobic microbes can also worsen damage. Other options—sunlight, cold air, or nutrient toxicity from overwatering—don’t address why flooded areas kill plants as accurately as oxygen deprivation does.

When soil is flooded, the spaces between soil particles are filled with water, which greatly reduces the amount of oxygen available to roots. Plants need oxygen for cellular respiration to produce the energy required to take up water and nutrients. Without enough oxygen, root cells can’t generate energy, the roots deteriorate, and their ability to absorb water and minerals drops. This leads to wilting, nutrient deficiencies, and eventually plant death. In flooded conditions, the primary issue is the root zone becoming oxygen-starved (anoxic), though anaerobic microbes can also worsen damage. Other options—sunlight, cold air, or nutrient toxicity from overwatering—don’t address why flooded areas kill plants as accurately as oxygen deprivation does.