Question:
When roots are deprived of __________ they show a sudden drop in active absorption.
When roots are deprived of __________ they show a sudden drop in active absorption.
Show Hint
Active absorption needs metabolic energy, which depends on respiration.
Updated On: Nov 13, 2026
Manganese
Oxygen
Carbon dioxide
Iron
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Active absorption of ions by roots happens against a concentration gradient and needs ATP.
Step 2: Key Point
ATP is produced by aerobic respiration, which needs oxygen.
If oxygen is removed, respiration slows and ion absorption drops suddenly.
Step 3: Compare the options
Manganese and iron are mineral nutrients, and carbon dioxide is not needed for energy supply.
So oxygen is the answer.
Final Answer:
Lack of oxygen sharply reduces active absorption. \[ \boxed{\text{(B) }\text{Oxygen}} \]
Active absorption of ions by roots happens against a concentration gradient and needs ATP.
Step 2: Key Point
ATP is produced by aerobic respiration, which needs oxygen.
If oxygen is removed, respiration slows and ion absorption drops suddenly.
Step 3: Compare the options
Manganese and iron are mineral nutrients, and carbon dioxide is not needed for energy supply.
So oxygen is the answer.
Final Answer:
Lack of oxygen sharply reduces active absorption. \[ \boxed{\text{(B) }\text{Oxygen}} \]
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