NEET 2025 MCQ with Answer Explanation : “Mineral Nutrition”.

Question 61
What is the primary symptom of a calcium deficiency in crops?

A) Stunted growth
B) Blossom end rot
C) Leaf curling
D) Yellowing of leaves

Correct Answer: B) Blossom end rot

Explanation: Calcium deficiency, particularly in fruiting plants, can lead to blossom end rot, especially in tomatoes.

Question 62
Which mineral is known to aid in the synthesis of nucleic acids?

A) Iron
B) Phosphorus
C) Molybdenum
D) Magnesium

Correct Answer: B) Phosphorus

Explanation: Phosphorus is a key component of nucleic acids (DNA and RNA), crucial for genetic information.

Question 63
What can excessive nitrogen fertilization cause in plants?

A) Leaf chlorosis
B) Enhanced root growth
C) Lush foliage with poor fruit quality
D) Increased disease resistance

Correct Answer: C) Lush foliage with poor fruit quality

Explanation: Excess nitrogen can lead to excessive vegetative growth at the expense of fruit development and quality.

Question 64
Which nutrient is crucial for seed germination and early growth?

A) Phosphorus
B) Nitrogen
C) Calcium
D) Potassium

Correct Answer: A) Phosphorus

Explanation: Phosphorus is essential for energy transfer and root development during seed germination.

Question 65
A plant showing stunted growth and small leaves may be deficient in:

A) Iron
B) Calcium
C) Nitrogen
D) Boron

Correct Answer: C) Nitrogen

Explanation: Nitrogen deficiency typically results in stunted growth and smaller leaves due to its role in protein synthesis.

Question 66
Which nutrient plays a significant role in the metabolism of carbohydrates in plants?

A) Manganese
B) Magnesium
C) Zinc
D) Potassium

Correct Answer: B) Magnesium

Explanation: Magnesium is involved in the enzymatic processes that metabolize carbohydrates, especially in photosynthesis.

Question 67
What deficiency is associated with poor flowering and fruiting?

A) Iron
B) Calcium
C) Boron
D) Nitrogen

Correct Answer: C) Boron

Explanation: Boron is crucial for flower and fruit development, and its deficiency can lead to poor reproductive success.

Question 68
What role does potassium play in plant defense mechanisms?

A) Enhances nitrogen uptake
B) Strengthens cell walls
C) Increases resistance to drought
D) Stimulates enzyme activity

Correct Answer: C) Increases resistance to drought

Explanation: Potassium helps regulate stomatal opening, improving water use efficiency and drought resistance.

Question 69
Which of the following nutrients can lead to “iron chlorosis” when in excess?

A) Phosphorus
B) Calcium
C) Manganese
D) Boron

Correct Answer: A) Phosphorus

Explanation: Excess phosphorus can hinder iron uptake, leading to iron chlorosis in plants.