Question:
Which of the following are true about nitrogen nutrition in plant?
A. Nitrogen is the constituent of chlorophyll, amino-acids, protein, RNA and DNA.
B. Nitrogen deficiency symptoms appears first on the new leaves.
C. Excess nitrogen advances maturity of crops.
D. In nitrogen, deficiency symptoms first appears on the tip of the leaf.
E. In plant, nitrogen translocated from older leaves to new leaves.
Choose the correct answer from the options given below:
Which of the following are true about nitrogen nutrition in plant?
A. Nitrogen is the constituent of chlorophyll, amino-acids, protein, RNA and DNA.
B. Nitrogen deficiency symptoms appears first on the new leaves.
C. Excess nitrogen advances maturity of crops.
D. In nitrogen, deficiency symptoms first appears on the tip of the leaf.
E. In plant, nitrogen translocated from older leaves to new leaves.
Choose the correct answer from the options given below:
A. Nitrogen is the constituent of chlorophyll, amino-acids, protein, RNA and DNA.
B. Nitrogen deficiency symptoms appears first on the new leaves.
C. Excess nitrogen advances maturity of crops.
D. In nitrogen, deficiency symptoms first appears on the tip of the leaf.
E. In plant, nitrogen translocated from older leaves to new leaves.
Choose the correct answer from the options given below:
Show Hint
Highly mobile nutrients (N, P, K, Mg) show deficiency symptoms first on older leaves. Immobile nutrients (Ca, Fe, B) show deficiency symptoms first on younger leaves.
Updated On: Aug 13, 2026
- A, B and D only
- A, B and E only
- B, C and D only
- A, D and E only
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Nitrogen is an essential macronutrient for plants.
Its physiological roles, mobility within the plant, and corresponding deficiency symptoms are critical to understanding plant nutrition.
Step 2: Detailed Explanation:
Let us evaluate each statement:
- Statement A: Nitrogen is a key structural component of amino acids, proteins, enzymes, nucleic acids (RNA/DNA), and chlorophyll. This is correct.
- Statement B: Nitrogen is highly mobile within the plant.
When deficiency occurs, nitrogen is mobilized from older tissues and translocated to younger growing tissues.
Therefore, deficiency symptoms appear first on older leaves, not new leaves. This is incorrect.
- Statement C: Excess nitrogen promotes vigorous vegetative growth, which delays crop maturity rather than advancing it. This is incorrect.
- Statement D: Nitrogen deficiency causes chlorosis (yellowing), which begins at the tip of the older leaves and progresses in a 'V' shape along the midrib. This is correct.
- Statement E: Because of its high mobility, nitrogen is readily translocated from older senescing leaves to new developing leaves. This is correct.
Therefore, statements A, D, and E are correct.
Step 3: Final Answer:
The correct combination is A, D and E only.
Nitrogen is an essential macronutrient for plants.
Its physiological roles, mobility within the plant, and corresponding deficiency symptoms are critical to understanding plant nutrition.
Step 2: Detailed Explanation:
Let us evaluate each statement:
- Statement A: Nitrogen is a key structural component of amino acids, proteins, enzymes, nucleic acids (RNA/DNA), and chlorophyll. This is correct.
- Statement B: Nitrogen is highly mobile within the plant.
When deficiency occurs, nitrogen is mobilized from older tissues and translocated to younger growing tissues.
Therefore, deficiency symptoms appear first on older leaves, not new leaves. This is incorrect.
- Statement C: Excess nitrogen promotes vigorous vegetative growth, which delays crop maturity rather than advancing it. This is incorrect.
- Statement D: Nitrogen deficiency causes chlorosis (yellowing), which begins at the tip of the older leaves and progresses in a 'V' shape along the midrib. This is correct.
- Statement E: Because of its high mobility, nitrogen is readily translocated from older senescing leaves to new developing leaves. This is correct.
Therefore, statements A, D, and E are correct.
Step 3: Final Answer:
The correct combination is A, D and E only.
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