Here below some basic MCQ’s about “Mineral Nutrition” with answer which is explained details. Let’s check one by one which is given below.
Question 1
Which of the following minerals is primarily involved in the synthesis of chlorophyll?
A) Nitrogen
B) Iron
C) Magnesium
D) Manganese
Correct Answer: B) Iron
Explanation: Iron is essential for the synthesis of chlorophyll. A deficiency in iron leads to chlorosis, particularly in young leaves, due to its critical role in photosynthesis and the formation of chlorophyll.
Question 2
What is the main function of potassium in plants?
A) Protein synthesis
B) Water regulation
C) Photosynthesis
D) DNA replication
Correct Answer: B) Water regulation
Explanation: Potassium plays a vital role in osmoregulation and helps maintain turgor pressure in plant cells, which is crucial for water regulation. It also activates various enzymes but is primarily known for its role in water management.
Question 3
A plant shows stunted growth and dark green leaves. What nutrient deficiency might this indicate?
A) Phosphorus
B) Nitrogen
C) Calcium
D) Zinc
Correct Answer: A) Phosphorus
Explanation: Phosphorus deficiency typically leads to stunted growth and can cause leaves to develop a darker green color. Phosphorus is essential for energy transfer and nucleic acid formation, so its deficiency directly impacts growth.
Question 4
Which micronutrient is most important for the formation of enzymes and hormones in plants?
A) Copper
B) Boron
C) Manganese
D) Zinc
Correct Answer: D) Zinc
Explanation: Zinc is crucial for the synthesis of various enzymes and plant hormones. It plays a key role in growth regulation and is important for the overall metabolic processes in plants.
Question 5
In which condition does the availability of phosphorus decrease significantly in the soil?
A) Acidic soil
B) Alkaline soil
C) Neutral soil
D) Loamy soil
Correct Answer: A) Acidic soil
Explanation: In acidic soils, phosphorus can form insoluble complexes with iron and aluminum, making it less available to plants. Alkaline soils can also cause issues, but phosphorus is most notably tied to acidity-related availability problems.
Question 6
Which of the following is a major component of amino acids?
A) Phosphorus
B) Nitrogen
C) Potassium
D) Calcium
Correct Answer: B) Nitrogen
Explanation: Nitrogen is a key component of amino acids, which are the building blocks of proteins. It is essential for plant growth and development.
Question 7
What is the role of calcium in plants?
A) Energy transfer
B) Cell wall stability
C) Chlorophyll synthesis
D) Protein synthesis
Correct Answer: B) Cell wall stability
Explanation: Calcium is important for maintaining the structural integrity of cell walls and plays a role in cell division and signaling.
Question 8
Which deficiency is characterized by necrotic spots and leaf curling?
A) Nitrogen
B) Potassium
C) Calcium
D) Magnesium
Correct Answer: B) Potassium
Explanation: Potassium deficiency often results in leaf curling and necrotic spots due to its role in osmoregulation and enzyme activation.
Question 9
Manganese is primarily involved in which of the following processes?
A) Photosynthesis
B) Respiration
C) Nucleic acid synthesis
D) Lipid metabolism
Correct Answer: A) Photosynthesis
Explanation: Manganese plays a crucial role in the photosynthetic process, particularly in the water-splitting reaction.
Question 10
A plant showing interveinal chlorosis is most likely deficient in:
A) Nitrogen
B) Magnesium
C) Potassium
D) Calcium
Correct Answer: B) Magnesium
Explanation: Magnesium deficiency leads to interveinal chlorosis because magnesium is a central component of chlorophyll.
Question 11
Which nutrient is critical for the formation of nucleic acids?
A) Phosphorus
B) Iron
C) Boron
D) Zinc
Correct Answer: A) Phosphorus
Explanation: Phosphorus is a key component of nucleic acids (DNA and RNA) and is vital for genetic material and energy transfer.
Question 12
Deficiency of which micronutrient can lead to the rosetting of leaves in plants?
A) Iron
B) Manganese
C) Boron
D) Copper
Correct Answer: C) Boron
Explanation: Boron deficiency can cause rosetting in plants, affecting the growth of young tissues.
Question 13
Which of the following nutrients is primarily absorbed in its ionic form?
A) Nitrogen
B) Phosphorus
C) Potassium
D) Calcium
Correct Answer: C) Potassium
Explanation: Potassium is mostly absorbed by plants in its ionic form (K⁺) and plays a crucial role in various physiological processes.
Question 14
Which nutrient deficiency leads to the “whiptail” condition in cauliflower?
A) Manganese
B) Nitrogen
C) Boron
D) Calcium
Correct Answer: C) Boron
Explanation: Boron deficiency causes the “whiptail” condition in cauliflower, affecting leaf development.
Question 15
What effect does high phosphorus levels in the soil have on zinc availability?
A) Increases zinc availability
B) Decreases zinc availability
C) No effect
D) Completely replaces zinc
Correct Answer: B) Decreases zinc availability
Explanation: High phosphorus levels can inhibit the uptake of zinc due to competition and interactions in the soil.
Question 16
Which nutrient is necessary for the synthesis of certain plant hormones like auxins?
A) Boron
B) Calcium
C) Iron
D) Nitrogen
Correct Answer: A) Boron
Explanation: Boron is involved in the synthesis of plant hormones, particularly auxins, which regulate growth.
Question 17
Which nutrient deficiency causes stunted growth and poor root development?
A) Nitrogen
B) Phosphorus
C) Calcium
D) Magnesium
Correct Answer: B) Phosphorus
Explanation: Phosphorus deficiency can significantly impact root development and overall plant growth.
Question 18
Which of the following is NOT considered a macronutrient?
A) Nitrogen
B) Potassium
C) Iron
D) Calcium
Correct Answer: C) Iron
Explanation: Iron is a micronutrient, while nitrogen, potassium, and calcium are macronutrients needed in larger quantities.
Question 19
In plants, which mineral is essential for the regulation of osmotic pressure?
A) Calcium
B) Potassium
C) Magnesium
D) Sodium
Correct Answer: B) Potassium
Explanation: Potassium is crucial for regulating osmotic pressure and maintaining turgor in plant cells.
Question 20
What is the main symptom of calcium deficiency in plants?
A) Leaf curl
B) Blossom end rot
C) Interveinal chlorosis
D) Stunted growth
Correct Answer: B) Blossom end rot
Explanation: Calcium deficiency in fruits, particularly tomatoes, leads to blossom end rot, where the bottom of the fruit rots.
Question 21
Which of the following is a primary role of magnesium in plants?
A) Synthesis of proteins
B) Activation of enzymes
C) Formation of chlorophyll
D) Water absorption
Correct Answer: C) Formation of chlorophyll
Explanation: Magnesium is a central component of chlorophyll and is essential for photosynthesis.
Question 22
A plant exhibiting yellowing of older leaves is likely deficient in:
A) Nitrogen
B) Calcium
C) Iron
D) Potassium
Correct Answer: A) Nitrogen
Explanation: Nitrogen deficiency typically causes chlorosis, starting with the older leaves as nitrogen is mobile within the plant.
Question 23
What is the main function of iron in plants?
A) Energy storage
B) Chlorophyll synthesis
C) Cell wall formation
D) Water uptake
Correct Answer: B) Chlorophyll synthesis
Explanation: Iron is crucial for the synthesis of chlorophyll and is involved in various enzymatic reactions.
Question 24
Which of the following minerals is important for stomatal movement?
A) Nitrogen
B) Magnesium
C) Potassium
D) Calcium
Correct Answer: C) Potassium
Explanation: Potassium is essential for the opening and closing of stomata, thus regulating gas exchange and transpiration.
Question 25
What symptom is commonly associated with boron deficiency?
A) Leaf necrosis
B) Poor fruit development
C) Stunted growth
D) Chlorosis
Correct Answer: B) Poor fruit development
Explanation: Boron deficiency can lead to poor fruit and flower development, affecting overall yield.
Question 26
Which nutrient is involved in nitrogen fixation in legumes?
A) Potassium
B) Iron
C) Molybdenum
D) Phosphorus
Correct Answer: C) Molybdenum
Explanation: Molybdenum is essential for the enzyme nitrate reductase, which is involved in nitrogen fixation in legumes.
Question 27
Which of the following is NOT a function of potassium in plants?
A) Enzyme activation
B) Protein synthesis
C) Photosynthesis
D) Stomatal regulation
Correct Answer: B) Protein synthesis
Explanation: While potassium is important for many plant processes, protein synthesis primarily involves nitrogen and other elements.
Question 28
In plants, what is the function of sodium?
A) Promotes growth
B) Aids in photosynthesis
C) Regulates osmotic balance
D) Forms chlorophyll
Correct Answer: C) Regulates osmotic balance
Explanation: Sodium can play a role in regulating osmotic pressure in some plants, though it is not essential for all.
Question 29
Which of the following is a sign of magnesium deficiency?
A) Red leaves
B) Chlorosis between veins
C) Leaf curling
D) Blossom end rot
Correct Answer: B) Chlorosis between veins
Explanation: Magnesium deficiency leads to interveinal chlorosis, primarily in older leaves.
Question 30
What role does sulfur play in plants?
A) Formation of amino acids
B) Regulation of water loss
C) Synthesis of chlorophyll
D) Energy transfer
Correct Answer: A) Formation of amino acids
Explanation: Sulfur is a key component of amino acids and is essential for protein synthesis in plants.
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.
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.
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.
Question 61
What is the primary symptom of a calcium deficiency in crops?
A) Stunted growth
B) Blossom end rot
C) Leaf curling
D) Yellowing of leaves
Correct Answer: B) Blossom end rot
Explanation: Calcium deficiency, particularly in fruiting plants, can lead to blossom end rot, especially in tomatoes.
Question 62
Which mineral is known to aid in the synthesis of nucleic acids?
A) Iron
B) Phosphorus
C) Molybdenum
D) Magnesium
Correct Answer: B) Phosphorus
Explanation: Phosphorus is a key component of nucleic acids (DNA and RNA), crucial for genetic information.
Question 63
What can excessive nitrogen fertilization cause in plants?
A) Leaf chlorosis
B) Enhanced root growth
C) Lush foliage with poor fruit quality
D) Increased disease resistance
Correct Answer: C) Lush foliage with poor fruit quality
Explanation: Excess nitrogen can lead to excessive vegetative growth at the expense of fruit development and quality.
Question 64
Which nutrient is crucial for seed germination and early growth?
A) Phosphorus
B) Nitrogen
C) Calcium
D) Potassium
Correct Answer: A) Phosphorus
Explanation: Phosphorus is essential for energy transfer and root development during seed germination.
Question 65
A plant showing stunted growth and small leaves may be deficient in:
A) Iron
B) Calcium
C) Nitrogen
D) Boron
Correct Answer: C) Nitrogen
Explanation: Nitrogen deficiency typically results in stunted growth and smaller leaves due to its role in protein synthesis.
Question 66
Which nutrient plays a significant role in the metabolism of carbohydrates in plants?
A) Manganese
B) Magnesium
C) Zinc
D) Potassium
Correct Answer: B) Magnesium
Explanation: Magnesium is involved in the enzymatic processes that metabolize carbohydrates, especially in photosynthesis.
Question 67
What deficiency is associated with poor flowering and fruiting?
A) Iron
B) Calcium
C) Boron
D) Nitrogen
Correct Answer: C) Boron
Explanation: Boron is crucial for flower and fruit development, and its deficiency can lead to poor reproductive success.
Question 68
What role does potassium play in plant defense mechanisms?
A) Enhances nitrogen uptake
B) Strengthens cell walls
C) Increases resistance to drought
D) Stimulates enzyme activity
Correct Answer: C) Increases resistance to drought
Explanation: Potassium helps regulate stomatal opening, improving water use efficiency and drought resistance.
Question 69
Which of the following nutrients can lead to “iron chlorosis” when in excess?
A) Phosphorus
B) Calcium
C) Manganese
D) Boron
Correct Answer: A) Phosphorus
Explanation: Excess phosphorus can hinder iron uptake, leading to iron chlorosis in plants.
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.
Question 81
Which nutrient is primarily responsible for the osmotic regulation in plant cells?
A) Calcium
B) Potassium
C) Nitrogen
D) Phosphorus
Correct Answer: B) Potassium
Explanation: Potassium plays a vital role in osmotic regulation, helping maintain turgor pressure and water balance in plant cells.
Question 82
A deficiency in which micronutrient can lead to “whiptail” in cauliflower?
A) Molybdenum
B) Calcium
C) Zinc
D) Boron
Correct Answer: A) Molybdenum
Explanation: Molybdenum deficiency can cause whiptail, characterized by distorted and curled leaves in cauliflower.
Question 83
Which nutrient is essential for the synthesis of chlorophyll and energy metabolism?
A) Zinc
B) Iron
C) Magnesium
D) Manganese
Correct Answer: B) Iron
Explanation: Iron is crucial for chlorophyll synthesis and is involved in many redox reactions during energy metabolism.
Question 84
What is the effect of phosphorus deficiency on flowering plants?
A) Increased flowering
B) Delayed flowering
C) Enhanced fruit set
D) Leaf curl
Correct Answer: B) Delayed flowering
Explanation: Phosphorus deficiency can delay flowering and reduce overall reproductive success in plants.
Question 85
Which nutrient is important for seed development and maturation?
A) Nitrogen
B) Boron
C) Phosphorus
D) Calcium
Correct Answer: C) Phosphorus
Explanation: Phosphorus is crucial for energy transfer and is especially important during seed development and maturation.
Question 86
Which nutrient deficiency can lead to the “frost tolerance” issue in plants?
A) Calcium
B) Potassium
C) Magnesium
D) Manganese
Correct Answer: B) Potassium
Explanation: Potassium enhances a plant’s ability to withstand frost by regulating water content and cell turgor.
Question 87
Which element is necessary for the proper functioning of chloroplasts?
A) Molybdenum
B) Iron
C) Calcium
D) Sodium
Correct Answer: B) Iron
Explanation: Iron is essential for chloroplast function, particularly in the formation of chlorophyll and photosynthetic processes.
Question 88
What role does nitrogen play in plant metabolism?
A) Energy storage
B) Protein synthesis
C) Root development
D) Water absorption
Correct Answer: B) Protein synthesis
Explanation: Nitrogen is a key component of amino acids, the building blocks of proteins, and is vital for plant growth.
Question 89
Which nutrient deficiency can cause “tip burn” in lettuce?
A) Nitrogen
B) Potassium
C) Calcium
D) Magnesium
Correct Answer: C) Calcium
Explanation: Calcium deficiency in lettuce leads to tip burn, where the leaf edges die back due to a lack of structural integrity.
Question 90
What is the primary function of sulfur in plants?
A) Energy transfer
B) Photosynthesis
C) Protein synthesis
D) Root growth
Correct Answer: C) Protein synthesis
Explanation: Sulfur is essential for the formation of amino acids and proteins, influencing overall plant growth.
Question 91
Which nutrient is associated with the development of flower and fruit structures?
A) Manganese
B) Nitrogen
C) Boron
D) Calcium
Correct Answer: C) Boron
Explanation: Boron is crucial for proper flower and fruit development, impacting fertilization and seed set.
Question 92
What is the result of excess phosphorus in the soil?
A) Improved nitrogen fixation
B) Toxicity to plants
C) Reduced iron availability
D) Enhanced root growth
Correct Answer: C) Reduced iron availability
Explanation: Excess phosphorus can inhibit iron uptake, leading to iron deficiency symptoms in plants.
Question 93
Which nutrient is involved in the synthesis of certain plant hormones?
A) Copper
B) Zinc
C) Boron
D) Magnesium
Correct Answer: C) Boron
Explanation: Boron is essential for the synthesis of plant hormones, particularly auxins, affecting growth and development.
Question 94
What deficiency can lead to “root rot” in plants?
A) Calcium
B) Phosphorus
C) Potassium
D) Nitrogen
Correct Answer: A) Calcium
Explanation: Calcium deficiency can weaken root structures, making them more susceptible to rot and disease.
Question 95
Which nutrient is essential for the activation of enzymes involved in photosynthesis?
A) Magnesium
B) Iron
C) Manganese
D) Boron
Correct Answer: A) Magnesium
Explanation: Magnesium is vital for the activation of enzymes that facilitate the photosynthetic process.
Question 96
Which micronutrient is known to be involved in chlorophyll synthesis?
A) Zinc
B) Iron
C) Molybdenum
D) Copper
Correct Answer: B) Iron
Explanation: Iron is essential for chlorophyll synthesis, influencing the green color and photosynthetic capability of leaves.
Question 97
What role does potassium play in plant health during drought conditions?
A) Enhances photosynthesis
B) Improves nutrient uptake
C) Regulates stomatal opening
D) Promotes root elongation
Correct Answer: C) Regulates stomatal opening
Explanation: Potassium helps control stomatal opening, which is critical for regulating water loss during drought.
Question 98
A deficiency in which nutrient can lead to reduced chlorophyll production and yellowing leaves?
A) Nitrogen
B) Iron
C) Magnesium
D) Calcium
Correct Answer: B) Iron
Explanation: Iron deficiency directly impacts chlorophyll production, resulting in yellowing of the leaves.
Question 99
Which nutrient is particularly important for the formation of the structure of cell walls?
A) Nitrogen
B) Calcium
C) Potassium
D) Phosphorus
Correct Answer: B) Calcium
Explanation: Calcium is vital for maintaining cell wall structure and stability, playing a role in cell division and growth.
Question 100
What is the primary role of zinc in plant growth?
A) Energy production
B) Synthesis of proteins
C) Hormonal regulation
D) Enzyme activation
Correct Answer: D) Enzyme activation
Explanation: Zinc is crucial for activating various enzymes that are involved in many metabolic processes within plants
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