Q25 / 200 · MHT CET - Medical 2026 (24 April Shift 2) · Biology
Which type of mineral absorption shows a sudden drop when the roots are deprived of oxygen?
- APassive absorption by direct ion-exchange.
- BPassive absorption by mass flow.
- CDonnan equilibrium.
- Correct answerDActive Absorption.
Solution
Mineral absorption in plants can occur via passive or active processes.
Passive absorption does not require metabolic energy and includes mechanisms like direct ion-exchange, mass flow, and Donnan equilibrium. These processes are not directly dependent on oxygen availability.
Active absorption requires metabolic energy in the form of ATP, which is primarily generated through aerobic respiration. When roots are deprived of oxygen, aerobic respiration ceases, leading to a sudden drop in ATP production. Consequently, active absorption of minerals shows a sudden and significant decline.
Answer: Active Absorption.
Passive absorption does not require metabolic energy and includes mechanisms like direct ion-exchange, mass flow, and Donnan equilibrium. These processes are not directly dependent on oxygen availability.
Active absorption requires metabolic energy in the form of ATP, which is primarily generated through aerobic respiration. When roots are deprived of oxygen, aerobic respiration ceases, leading to a sudden drop in ATP production. Consequently, active absorption of minerals shows a sudden and significant decline.
Answer: Active Absorption.
Hence, the correct answer is option: 'D'.