Question 31
A deficiency in which micronutrient can lead to reduced root growth and increased susceptibility to disease?
A) Iron
B) Zinc
C) Manganese
D) Copper
Correct Answer: B) Zinc
Explanation: Zinc deficiency negatively impacts root development and can make plants more susceptible to pathogens.
Question 32
What symptom is typically associated with calcium deficiency?
A) Leaf curl
B) Blossom end rot
C) Interveinal chlorosis
D) Red coloration
Correct Answer: B) Blossom end rot
Explanation: Calcium deficiency, particularly in fruits, causes blossom end rot, a common issue in tomatoes and peppers.
Question 33
Which of the following nutrients is required in very small amounts but is essential for plant growth?
A) Phosphorus
B) Calcium
C) Manganese
D) Nitrogen
Correct Answer: C) Manganese
Explanation: Manganese is a micronutrient required in trace amounts but is essential for various enzymatic processes.
Question 34
What role does copper play in plants?
A) Photosynthesis
B) Respiration
C) Enzyme activation
D) All of the above
Correct Answer: D) All of the above
Explanation: Copper is involved in several physiological processes, including photosynthesis, respiration, and enzyme activation.
Question 35
Which nutrient deficiency is most likely to cause leaf necrosis and poor fruit quality?
A) Potassium
B) Calcium
C) Iron
D) Magnesium
Correct Answer: A) Potassium
Explanation: Potassium deficiency can lead to necrotic spots on leaves and poor quality in fruits due to its role in various metabolic processes.
Question 36
Which of the following is a characteristic symptom of nitrogen deficiency?
A) Yellowing of older leaves
B) Red veins in leaves
C) Stunted growth
D) Leaf curling
Correct Answer: A) Yellowing of older leaves
Explanation: Nitrogen deficiency often causes chlorosis starting from the older leaves, as nitrogen is mobile within the plant.
Question 37
What is the main effect of excessive potassium in the soil?
A) Enhances nitrogen uptake
B) Reduces magnesium uptake
C) Increases phosphorus availability
D) Promotes root growth
Correct Answer: B) Reduces magnesium uptake
Explanation: Excess potassium can interfere with magnesium absorption, leading to magnesium deficiency symptoms.
Question 38
Which nutrient is essential for the formation of chlorophyll and also helps in photosynthesis?
A) Iron
B) Zinc
C) Manganese
D) Potassium
Correct Answer: A) Iron
Explanation: Iron is critical for chlorophyll production and is necessary for the photosynthetic process in plants.
Question 39
What nutrient deficiency may result in leaf tip burn?
A) Calcium
B) Potassium
C) Nitrogen
D) Sulfur
Correct Answer: B) Potassium
Explanation: Leaf tip burn is commonly associated with potassium deficiency due to its role in regulating water and nutrient uptake.
Question 40
Which micronutrient is involved in the synthesis of auxins and can affect cell elongation?
A) Boron
B) Manganese
C) Iron
D) Zinc
Correct Answer: A) Boron
Explanation: Boron is involved in the synthesis of plant hormones like auxins, which regulate cell elongation and growth.
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