Question 51
Which nutrient helps improve the overall structure and aeration of the soil?
A) Nitrogen
B) Calcium
C) Phosphorus
D) Potassium
Correct Answer: B) Calcium
Explanation: Calcium helps improve soil structure and aeration, promoting root health.
Question 52
Which deficiency is characterized by the appearance of “leaf mosaic”?
A) Nitrogen
B) Potassium
C) Manganese
D) Iron
Correct Answer: C) Manganese
Explanation: Manganese deficiency can lead to a mosaic pattern on leaves due to uneven chlorophyll development.
Question 53
What is the role of molybdenum in plants?
A) Energy transfer
B) Nitrogen fixation
C) Photosynthesis
D) Cell division
Correct Answer: B) Nitrogen fixation
Explanation: Molybdenum is essential for the enzyme nitrate reductase, which is important for nitrogen fixation in legumes.
Question 54
A high concentration of which element can lead to nutrient imbalances in plants?
A) Nitrogen
B) Potassium
C) Sodium
D) Calcium
Correct Answer: C) Sodium
Explanation: Excess sodium can disrupt the uptake of essential nutrients, leading to imbalances and toxicity.
Question 55
Which micronutrient is involved in the formation of chlorophyll and affects photosynthesis?
A) Copper
B) Manganese
C) Iron
D) Zinc
Correct Answer: C) Iron
Explanation: Iron is crucial for chlorophyll synthesis and is directly involved in the photosynthetic process.
Question 56
Which nutrient is most likely to cause “iron chlorosis” when deficient?
A) Potassium
B) Iron
C) Magnesium
D) Calcium
Correct Answer: B) Iron
Explanation: Iron chlorosis is specifically due to insufficient iron in the plant, leading to yellowing between leaf veins.
Question 57
What is the main function of phosphorus in plant metabolism?
A) Enzyme activation
B) Energy storage and transfer
C) Cell wall structure
D) Protein synthesis
Correct Answer: B) Energy storage and transfer
Explanation: Phosphorus is a key player in energy metabolism, particularly in the form of ATP.
Question 58
Which mineral is associated with the “green revolution” and increased crop yields?
A) Potassium
B) Nitrogen
C) Iron
D) Zinc
Correct Answer: B) Nitrogen
Explanation: Nitrogen fertilizers significantly increased crop yields during the green revolution by enhancing protein synthesis and growth.
Question 59
What symptom does copper deficiency typically cause in plants?
A) Leaf wilting
B) Leaf tip burn
C) Stunted growth and dieback
D) Blossom end rot
Correct Answer: C) Stunted growth and dieback
Explanation: Copper deficiency can lead to stunted growth and dieback of young tissues in plants.
Question 60
Which nutrient is important for root development and is often added to fertilizers?
A) Nitrogen
B) Phosphorus
C) Calcium
D) Potassium
Correct Answer: B) Phosphorus
Explanation: Phosphorus promotes root development and is crucial during the early stages of plant growth.
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