1. Which of the following is an essential element for plants?
A) Sodium
B) Calcium
C) Silicon
D) Potassium
Answer: B) Calcium
2. What is the primary function of nitrogen in plants?
A) Cell wall formation
B) Protein synthesis
C) Photosynthesis
D) Water absorption
Answer: B) Protein synthesis
3. Iron is primarily involved in which process in plants?
A) Photosynthesis
B) Respiration
C) Chlorophyll formation
D) Protein synthesis
Answer: C) Chlorophyll formation
4. Which of these is considered a macronutrient for plants?
A) Boron
B) Nitrogen
C) Zinc
D) Copper
Answer: B) Nitrogen
5. Which mineral element is required for the synthesis of DNA in plants?
A) Magnesium
B) Phosphorus
C) Sulfur
D) Manganese
Answer: B) Phosphorus
6. Potassium plays a key role in which of the following plant processes?
A) Water regulation and osmotic balance
B) Photosynthesis
C) Nitrogen fixation
D) Transpiration
Answer: A) Water regulation and osmotic balance
7. A deficiency of which element causes chlorosis (yellowing of leaves) in plants?
A) Magnesium
B) Nitrogen
C) Iron
D) Potassium
Answer: C) Iron
8. Which of the following is NOT a macronutrient for plants?
A) Nitrogen
B) Phosphorus
C) Boron
D) Potassium
Answer: C) Boron
9. Which element is a key component of chlorophyll?
A) Magnesium
B) Calcium
C) Sulfur
D) Phosphorus
Answer: A) Magnesium
10. Zinc is an essential micronutrient that helps in:
A) Protein synthesis
B) Carbohydrate metabolism
C) Chlorophyll synthesis
D) Enzyme activation
Answer: D) Enzyme activation
11. Which of the following elements is required for the synthesis of amino acids in plants?
A) Nitrogen
B) Phosphorus
C) Calcium
D) Potassium
Answer: A) Nitrogen
12. A deficiency of which element can lead to reduced fruit production in plants?
A) Phosphorus
B) Potassium
C) Magnesium
D) Calcium
Answer: B) Potassium
13. Which of the following is a micro-nutrient for plants?
A) Manganese
B) Carbon
C) Oxygen
D) Nitrogen
Answer: A) Manganese
14. Sulfur is essential for plants because it is a component of:
A) Amino acids
B) Cellulose
C) Phospholipids
D) DNA
Answer: A) Amino acids
15. Which element is involved in the formation of cell walls in plants?
A) Calcium
B) Potassium
C) Magnesium
D) Sulfur
Answer: A) Calcium
16. Deficiency of which element in plants causes “Nutrient Deficiency Syndrome” or “Stunted Growth”?
A) Nitrogen
B) Phosphorus
C) Potassium
D) Calcium
Answer: A) Nitrogen
17. Which of the following is required in the largest quantity by plants?
A) Potassium
B) Calcium
C) Nitrogen
D) Magnesium
Answer: C) Nitrogen
18. Manganese deficiency in plants causes:
A) Chlorosis
B) Necrosis
C) Poor root growth
D) Yellowing of leaves
Answer: A) Chlorosis
19. Which element is involved in the activation of many enzymes, particularly those involved in respiration?
A) Magnesium
B) Manganese
C) Iron
D) Copper
Answer: B) Manganese
20. Which of the following is the role of phosphorus in plants?
A) Energy transfer and storage
B) Cell division
C) Protein formation
D) All of the above
Answer: D) All of the above
21. Which element helps in the formation of nucleic acids and ATP in plants?
A) Phosphorus
B) Potassium
C) Nitrogen
D) Calcium
Answer: A) Phosphorus
22. Which of the following is NOT an essential macro-nutrient for plants?
A) Nitrogen
B) Potassium
C) Iron
D) Calcium
Answer: C) Iron
23. Which mineral element is needed for the synthesis of proteins and enzymes in plants?
A) Zinc
B) Potassium
C) Nitrogen
D) Phosphorus
Answer: C) Nitrogen
24. What is the primary function of boron in plants?
A) Nitrogen metabolism
B) Cell wall formation and transport
C) Photosynthesis
D) Energy production
Answer: B) Cell wall formation and transport
25. What does calcium deficiency in plants typically cause?
A) Chlorosis
B) Necrosis of leaf margins
C) Reduced flowering
D) Poor root development
Answer: B) Necrosis of leaf margins
26. Which of the following elements is essential for the proper functioning of stomatal guard cells?
A) Nitrogen
B) Potassium
C) Calcium
D) Magnesium
Answer: B) Potassium
27. A plant that is deficient in sulfur will likely show symptoms of:
A) Yellowing leaves
B) Stunted growth
C) Leaf curling
D) Root rot
Answer: A) Yellowing leaves
28. What is the main function of potassium in plants?
A) Photosynthesis
B) Protein synthesis
C) Regulation of water balance
D) Chlorophyll synthesis
Answer: C) Regulation of water balance
29. Which of these elements is involved in the synthesis of enzymes and vitamins in plants?
A) Magnesium
B) Zinc
C) Manganese
D) Potassium
Answer: B) Zinc
30. The process by which plants take up water and essential mineral elements is called:
A) Transpiration
B) Photosynthesis
C) Absorption
D) Respiration
Answer: C) Absorption
