Question 41
Which nutrient is known to influence the formation of root nodules in legumes?
A) Manganese
B) Iron
C) Phosphorus
D) Calcium
Correct Answer: B) Iron
Explanation: Iron is essential for the formation of root nodules in legumes, where nitrogen fixation occurs.
Question 42
Which of the following nutrients is primarily responsible for cell division and elongation in plants?
A) Calcium
B) Nitrogen
C) Potassium
D) Magnesium
Correct Answer: A) Calcium
Explanation: Calcium plays a crucial role in cell division and elongation, impacting overall growth.
Question 43
What is the effect of high levels of sodium in sensitive plants?
A) Stimulates growth
B) Causes salt stress
C) Enhances nutrient uptake
D) Improves fruit quality
Correct Answer: B) Causes salt stress
Explanation: High sodium levels can cause salt stress in sensitive plants, leading to dehydration and nutrient imbalances.
Question 44
Which nutrient deficiency results in the yellowing of younger leaves?
A) Nitrogen
B) Phosphorus
C) Magnesium
D) Iron
Correct Answer: D) Iron
Explanation: Iron deficiency causes chlorosis primarily in younger leaves due to its immobility within the plant.
Question 45
The primary role of phosphorus in plants includes:
A) Energy transfer and storage
B) Regulation of stomatal opening
C) Synthesis of chlorophyll
D) Cell wall formation
Correct Answer: A) Energy transfer and storage
Explanation: Phosphorus is critical for energy transfer (via ATP) and is vital for cellular processes.
Question 46
A deficiency in which micronutrient can lead to poor seed set in crops?
A) Iron
B) Boron
C) Zinc
D) Copper
Correct Answer: B) Boron
Explanation: Boron is crucial for proper flower development and fertilization, affecting seed set in crops.
Question 47
Which of the following nutrients is required for the synthesis of proteins?
A) Calcium
B) Potassium
C) Nitrogen
D) Sodium
Correct Answer: C) Nitrogen
Explanation: Nitrogen is a key component of amino acids, which are the building blocks of proteins.
Question 48
What is the primary function of zinc in plants?
A) Energy production
B) Enzyme activation
C) Photosynthesis
D) Chlorophyll formation
Correct Answer: B) Enzyme activation
Explanation: Zinc is essential for the activation of various enzymes involved in biochemical processes.
Question 49
Which nutrient is known to help with the movement of water in plants?
A) Potassium
B) Nitrogen
C) Calcium
D) Manganese
Correct Answer: A) Potassium
Explanation: Potassium aids in osmoregulation, helping to manage water movement within the plant.
Question 50
A plant suffering from “dieback” is most likely deficient in:
A) Iron
B) Calcium
C) Boron
D) Magnesium
Correct Answer: C) Boron
Explanation: Boron deficiency can lead to dieback, where the tips of shoots and roots die.
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