Question 70
Which nutrient is crucial for maintaining pH balance in soil?
A) Potassium
B) Nitrogen
C) Calcium
D) Iron
Correct Answer: C) Calcium
Explanation: Calcium helps to neutralize acidity in the soil, maintaining a balanced pH for optimal plant growth.
Question 71
Which of the following is a common symptom of manganese deficiency?
A) Leaf tip burn
B) Interveinal chlorosis
C) Leaf curl
D) Blossom end rot
Correct Answer: B) Interveinal chlorosis
Explanation: Manganese deficiency causes interveinal chlorosis, typically affecting young leaves.
Question 72
What is the primary function of potassium in flowering plants?
A) Enhances fruit quality
B) Promotes root growth
C) Increases nitrogen fixation
D) Aids in photosynthesis
Correct Answer: A) Enhances fruit quality
Explanation: Potassium improves fruit size, quality, and taste by regulating water and nutrient uptake.
Question 73
Which nutrient is known to influence the structure and function of cell membranes?
A) Calcium
B) Magnesium
C) Potassium
D) Phosphorus
Correct Answer: B) Magnesium
Explanation: Magnesium is important for stabilizing cellular structures and functions, including cell membranes.
Question 74
Which nutrient deficiency can cause poor root development and necrosis in roots?
A) Iron
B) Calcium
C) Manganese
D) Nitrogen
Correct Answer: B) Calcium
Explanation: Calcium deficiency can lead to poor root development and necrosis, affecting overall plant health.
Question 75
Which of the following nutrients is critical for the synthesis of auxins, which regulate plant growth?
A) Zinc
B) Manganese
C) Iron
D) Copper
Correct Answer: A) Zinc
Explanation: Zinc is involved in the synthesis of auxins, which are vital for cell elongation and growth regulation.
Question 76
What is the consequence of excessive magnesium in soil?
A) Enhanced fruit quality
B) Decreased phosphorus uptake
C) Improved chlorophyll synthesis
D) Increased nitrogen fixation
Correct Answer: B) Decreased phosphorus uptake
Explanation: Excess magnesium can interfere with phosphorus availability and uptake in plants.
Question 77
Which nutrient is involved in the development of nodules in nitrogen-fixing plants?
A) Iron
B) Molybdenum
C) Boron
D) Calcium
Correct Answer: B) Molybdenum
Explanation: Molybdenum is essential for nitrogen fixation and helps in the development of root nodules in legumes.
Question 78
What is the primary role of boron in plants?
A) Energy transfer
B) Cell division and elongation
C) Photosynthesis
D) Nutrient transport
Correct Answer: B) Cell division and elongation
Explanation: Boron is crucial for cell division, elongation, and the formation of new tissues.
Question 79
Which nutrient is required in the largest quantity by plants?
A) Calcium
B) Nitrogen
C) Potassium
D) Phosphorus
Correct Answer: B) Nitrogen
Explanation: Nitrogen is often required in larger amounts than other nutrients due to its critical role in protein and nucleic acid synthesis.
Question 80
What is the result of magnesium deficiency in plants?
A) Leaf drop
B) Interveinal chlorosis
C) Blossom end rot
D) Root rot
Correct Answer: B) Interveinal chlorosis
Explanation: Magnesium deficiency causes interveinal chlorosis, especially in older leaves, as magnesium is mobile within the plant.
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