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100 questions in this collection · Page 1 of 10
Question 1 of 100
📘 CLASS XI
Mineral Nutrition
Consider the following statements regarding hydroponics:
I. In 1860, Julius von Sachs demonstrated for the first time that plants can be grown to maturity in a defined nutrient solution in the complete absence of soil. II. The technique involves culture of plants in a soil-free, defined mineral solution using purified water and mineral nutrient salts. III. Hydroponics has been successfully employed for the commercial production of vegetables like tomato, seedless cucumber, and lettuce. IV. Poor aeration of the nutrient solution yields optimum root growth and element absorption.
Which of the statements given above are correct?
Statements I, II, and III are correct. Julius von Sachs demonstrated soil-free culture in 1860. Hydroponics involves growing plants in purified water containing defined mineral nutrient salts and is commercially used for crops such as tomato, seedless cucumber, and lettuce. Statement IV is incorrect because the nutrient solution must be adequately aerated for optimum root growth and mineral absorption.
Question 2 of 100
📘 CLASS XI
Mineral Nutrition
Which of the following statements strictly define the criteria for the essentiality of an element in plants?
I. The element must be absolutely necessary for supporting normal growth and reproduction. II. In the absence of the element, plants can complete their vegetative life cycle but cannot set seeds. III. The requirement of the element must be specific and cannot be replaced by supplying another element. IV. The element must be directly involved in the metabolism of the plant.
Select the correct options.
Statements I, III, and IV are the accepted criteria for essentiality. Statement II is incorrect because, without an essential element, a plant cannot complete its life cycle successfully.
Question 3 of 100
📘 CLASS XI
Mineral Nutrition
Analyze the following statements about macronutrients and micronutrients:
I. Macronutrients are generally present in plant tissues in excess of 10 mmole Kg-1 of dry matter. II. Micronutrients are needed in trace amounts, less than 10 mmole Kg-1 of dry matter. III. Carbon, hydrogen, oxygen, and nitrogen are macronutrients, where carbon, hydrogen, and oxygen are mainly obtained from CO2 and H2O. IV. Iron, manganese, copper, and sodium are essential micronutrients.
Which of the statements given above are correct?
Statements I, II, and III are correct. Statement IV is incorrect because sodium is considered a beneficial element and is not included among the 17 essential elements for higher plants.
Question 4 of 100
📘 CLASS XI
Mineral Nutrition
Consider the following statements regarding beneficial elements:
I. There are 17 elements recognized as absolutely essential for plant growth and metabolism. II. Sodium, silicon, cobalt, and selenium are beneficial elements required by higher plants. III. Beneficial elements are grouped under essential macronutrients because they are required in large quantities.
Which of the statements given above is/are correct?
Statements I and II are correct. Beneficial elements such as sodium, silicon, cobalt, and selenium are not classified as essential macronutrients. Hence Statement III is incorrect.
Question 5 of 100
📘 CLASS XI
Mineral Nutrition
Essential elements can be grouped based on their diverse functions. Consider the following statements:
I. Magnesium in chlorophyll and phosphorus in ATP are components of energy-related chemical compounds. II. Mg2+ is an activator for both ribulose bisphosphate carboxylase-oxygenase (RuBisCO) and phosphoenol pyruvate carboxylase (PEPcase). III. Zinc (Zn2+) is an activator of nitrogenase during nitrogen metabolism. IV. Potassium plays a major role in altering the osmotic potential of a cell, helping in the opening and closing of stomata.
Which of the statements given above are correct?
Statements I, II, and IV are correct. Magnesium forms part of chlorophyll and activates RuBisCO and PEPcase. Potassium regulates osmotic potential and stomatal movement. Statement III is incorrect because molybdenum (Mo), not zinc, activates nitrogenase.
Question 6 of 100
📘 CLASS XI
Mineral Nutrition
Regarding the role and absorption of nitrogen in plants, consider the following statements:
I. Nitrogen is the essential nutrient element required by plants in the greatest amount. II. It is absorbed by plants exclusively in the form of nitrate ions (NO3-). III. It is particularly required by meristematic tissues and metabolically active cells. IV. It is a major constituent of proteins, nucleic acids, vitamins, and hormones.
Which of the statements given above are correct?
Statements I, III, and IV are correct. Nitrogen is the most abundantly required essential nutrient and is a major constituent of proteins, nucleic acids, vitamins, and hormones. Statement II is incorrect because plants absorb nitrogen mainly as nitrate (NO3-) but also as ammonium (NH4+) and sometimes nitrite (NO2-).
Question 7 of 100
📘 CLASS XI
Mineral Nutrition
Identify the correct statements about potassium in plants:
I. It is required in more abundant quantities in meristematic tissues, buds, leaves, and root tips. II. It helps to maintain an anion-cation balance in cells. III. It is involved in protein synthesis and the maintenance of the turgidity of cells. IV. It is a structural constituent of the middle lamella of plant cell walls.
Select the correct combination.
Statements I, II, and III are correct. Potassium (K+) is abundant in actively dividing tissues, maintains anion-cation balance, and plays an important role in protein synthesis and maintaining cell turgidity. Statement IV is incorrect because the middle lamella contains calcium pectate, not potassium.
Question 8 of 100
📘 CLASS XI
Mineral Nutrition
Read the following statements regarding calcium:
I. Calcium is required by meristematic and differentiating tissues. II. During cell division, it is used in the synthesis of cell walls, particularly as calcium pectate in the middle lamella. III. It is needed during the formation of the mitotic spindle. IV. It is actively mobilized within the plant and accumulates in younger developing leaves.
Which of the statements given above are correct?
Statements I, II, and III are correct. Calcium is essential for meristematic tissues, forms calcium pectate in the middle lamella, and participates in mitotic spindle formation. Statement IV is incorrect because calcium is relatively immobile and therefore accumulates mainly in older leaves.
Question 9 of 100
📘 CLASS XI
Mineral Nutrition
Which of the statements given below are correct regarding magnesium?
I. It activates the enzymes of respiration and photosynthesis. II. It is involved in the synthesis of DNA and RNA. III. It is a constituent of the ring structure of chlorophyll and helps to maintain ribosome structure. IV. It is absorbed by plants in the form of monovalent Mg+ ions.
Select the correct options.
Statements I, II, and III are correct. Magnesium activates several enzymes of respiration and photosynthesis, participates in DNA and RNA synthesis, forms the central atom of chlorophyll, and stabilizes ribosome structure. Statement IV is incorrect because magnesium is absorbed as the divalent ion Mg2+.
Question 10 of 100
📘 CLASS XI
Mineral Nutrition
Consider the following statements about sulphur:
I. Plants obtain sulphur from the soil as elemental sulphur. II. Sulphur is present in two amino acids: cysteine and methionine. III. It is the main constituent of several coenzymes, ferredoxin, and vitamins like thiamine, biotin, and Coenzyme A.
Which of the statements given above are correct?
Statements II and III are correct. Sulphur is a constituent of cysteine, methionine, ferredoxin, thiamine, biotin, and Coenzyme A. Statement I is incorrect because plants absorb sulphur mainly as sulphate ions (SO42-).