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

Question 81
Which nutrient is primarily responsible for the osmotic regulation in plant cells?

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

Correct Answer: B) Potassium

Explanation: Potassium plays a vital role in osmotic regulation, helping maintain turgor pressure and water balance in plant cells.

Question 82
A deficiency in which micronutrient can lead to “whiptail” in cauliflower?

A) Molybdenum
B) Calcium
C) Zinc
D) Boron

Correct Answer: A) Molybdenum

Explanation: Molybdenum deficiency can cause whiptail, characterized by distorted and curled leaves in cauliflower.

Question 83
Which nutrient is essential for the synthesis of chlorophyll and energy metabolism?

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

Correct Answer: B) Iron

Explanation: Iron is crucial for chlorophyll synthesis and is involved in many redox reactions during energy metabolism.

Question 84
What is the effect of phosphorus deficiency on flowering plants?

A) Increased flowering
B) Delayed flowering
C) Enhanced fruit set
D) Leaf curl

Correct Answer: B) Delayed flowering

Explanation: Phosphorus deficiency can delay flowering and reduce overall reproductive success in plants.

Question 85
Which nutrient is important for seed development and maturation?

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

Correct Answer: C) Phosphorus

Explanation: Phosphorus is crucial for energy transfer and is especially important during seed development and maturation.

Question 86
Which nutrient deficiency can lead to the “frost tolerance” issue in plants?

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

Correct Answer: B) Potassium

Explanation: Potassium enhances a plant’s ability to withstand frost by regulating water content and cell turgor.

Question 87
Which element is necessary for the proper functioning of chloroplasts?

A) Molybdenum
B) Iron
C) Calcium
D) Sodium

Correct Answer: B) Iron

Explanation: Iron is essential for chloroplast function, particularly in the formation of chlorophyll and photosynthetic processes.

Question 88
What role does nitrogen play in plant metabolism?

A) Energy storage
B) Protein synthesis
C) Root development
D) Water absorption

Correct Answer: B) Protein synthesis

Explanation: Nitrogen is a key component of amino acids, the building blocks of proteins, and is vital for plant growth.

Question 89
Which nutrient deficiency can cause “tip burn” in lettuce?

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

Correct Answer: C) Calcium

Explanation: Calcium deficiency in lettuce leads to tip burn, where the leaf edges die back due to a lack of structural integrity.

Question 90
What is the primary function of sulfur in plants?

A) Energy transfer
B) Photosynthesis
C) Protein synthesis
D) Root growth

Correct Answer: C) Protein synthesis

Explanation: Sulfur is essential for the formation of amino acids and proteins, influencing overall plant growth.