Role of Macro and Micro-nutrients Questions in English

(C) Statement $S$ is true because sulfur is a structural component of the amino acids cysteine and methionine. Glycine does not contain sulfur.
Statement $R$ is false because phosphorus is a critical component of $ATP$ (Adenosine Triphosphate),which is the primary energy currency of the cell. Therefore,phosphorus plays a vital role in energy exchange processes (phosphorylation and dephosphorylation).
Since $S$ is true and $R$ is false,the correct option is $C$.

(C) The correct match is $C$.
$1$. Nitrogen is a major component of amino acids,proteins,nucleic acids,and chlorophyll,but not specifically biotin and thiamine.
$2$. Magnesium is a constituent of the ring structure of chlorophyll and helps in the activation of enzymes involved in respiration and photosynthesis.
$3$. Sulfur is present in two amino acids,$Cysteine$ and $Methionine$,and is also a constituent of several coenzymes,vitamins (thiamine,biotin,coenzyme $A$),and ferredoxin.
$4$. Boron is required for uptake and utilization of $Ca^{2+}$,pollen germination,cell elongation,cell differentiation,and carbohydrate translocation. It is not involved in the synthesis of hemoglobin or chlorophyll.

(D) The correct answer is $D$.
Calcium is primarily involved in the formation of bones and teeth,muscle contraction,and blood clotting.
It is not the primary cofactor for enzymes involved in the metabolism of carbohydrates,fats,and proteins; these roles are typically associated with minerals like Magnesium $(Mg^{2+})$ or Zinc $(Zn^{2+})$.
Chlorine is essential for maintaining osmotic balance and $pH$ in body fluids.
Molybdenum is a component of certain enzymes like xanthine oxidase.
Copper is a structural component of the enzyme tyrosinase,which is involved in melanin synthesis.

(C) Zinc $(Zn^{2+})$ is an essential micronutrient for plants.
It is primarily involved in the synthesis of the plant hormone auxin.
Additionally,it acts as a cofactor and is required for the activation of various enzymes,particularly carboxylases.
Therefore,option $C$ is the correct answer.

(A) Chlorine (in the form of chloride ions,$Cl^-$) plays a crucial role in maintaining osmotic balance and water regulation in the blood and extracellular fluids. It works alongside sodium $(Na^+)$ to regulate blood pressure and fluid volume.

(C) Organic molecules like proteins and nucleic acids contain carbon,hydrogen,oxygen,and nitrogen as major components.
However,elements like phosphorus and sulfur are also essential components of these molecules but are present in relatively smaller amounts compared to the primary elements.
For example,sulfur is found in amino acids like cysteine and methionine,and phosphorus is a key component of nucleic acids ($DNA$ and $RNA$) and $ATP$.

(D) Calcium is an essential mineral element that plays a crucial role in maintaining the structural integrity and permeability of the cell membrane. It is required for the formation of the middle lamella in the cell wall as calcium pectate. Furthermore,it is involved in the regulation of metabolic activities and acts as a cofactor for several enzymes. Therefore,calcium is the correct element that determines the permeability of the cell membrane.

(D) Assertion $(A)$ is false because Molybdenum is a component of enzymes like nitrogenase and nitrate reductase,not tyrosinase. Tyrosinase contains copper as a cofactor.
Reason $(R)$ is true because Molybdenum is a critical component of the nitrogenase enzyme,which is essential for biological nitrogen fixation in plants (e.g.,in root nodules of legumes).

(B) $ATP$ (Adenosine Triphosphate) consists of an adenine base,a ribose sugar,and three phosphate groups. Therefore,phosphorus is a structural component of $ATP$.
Magnesium ions $(Mg^{2+})$ act as essential cofactors for enzymes involved in $ATP$ synthesis,such as $ATP$ synthase,and are required for the stabilization of $ATP$ molecules during metabolic processes.
While both statements are scientifically correct,the fact that magnesium is required for synthesis does not explain why phosphorus is a structural component of the molecule. Thus,$R$ is not the correct explanation of $A$.

(D) Assertion $(A)$ is false because copper is not directly involved in the synthesis of chlorophyll. Magnesium is the essential mineral for chlorophyll synthesis.
Reason $(R)$ is true because the chlorophyll molecule consists of a porphyrin ring with a central magnesium atom $(Mg^{2+})$ coordinated to four nitrogen atoms.
Therefore,$A$ is false and $R$ is true.

(D) Statement $P$ is true because phosphorus is a vital component of $DNA$,$RNA$,$ATP$,and phospholipids,which are essential for growth and reproduction.
Statement $Q$ is false because magnesium $(Mg^{2+})$ is the central metal ion in the chlorophyll molecule,not copper. Copper is involved in electron transport chains (e.g.,plastocyanin) but is not a component of chlorophyll synthesis.

(B) The middle lamella is primarily composed of calcium pectate and magnesium pectate,which acts as a cementing layer between adjacent plant cells. Calcium is essential for the stability of the middle lamella.
Phosphorus is a key component of phospholipids,which are the primary structural components of the cell membrane (plasma membrane). Therefore,the mineral elements present in the middle lamella and cell membrane are Calcium and Phosphorus respectively.

(A) Boron $(B)$ is an essential micronutrient for plants.
It plays a critical role in pollen germination,pollen tube growth,and fruit setting.
It is also involved in the translocation of carbohydrates and is essential for cell division and cell elongation.
Therefore,it is directly associated with flowering and fruit development.

(C) $(1)$ Zinc $(c)$ is a cofactor for many enzymes involved in $DNA$ synthesis and cell division,which is essential for the repair of worn-out cells.
$(2)$ Phosphorus $(a)$ is a key component of the phosphate groups in $ATP$ (Adenosine Triphosphate).
$(3)$ Magnesium $(b)$ is required as a cofactor for enzymes like $ATP$ synthase and kinases involved in the synthesis and utilization of $ATP$.
$(4)$ Iron $(d)$ is the central metal ion in the heme group of myoglobin,which is responsible for oxygen storage in muscle tissues.
Therefore,the correct matching is $(1-c), (2-a), (3-b), (4-d)$.

(B) Carbonic anhydrase is a metalloenzyme that catalyzes the rapid interconversion of $CO_2$ and water to bicarbonate and protons. The active site of this enzyme contains a $Zn^{2+}$ ion,which is essential for its catalytic activity. Therefore,$Zinc$ is the required element.

(C) Statement $S$ is true because carbonic anhydrase is a zinc-containing enzyme that catalyzes the interconversion of $CO_2$ and $HCO_3^-$.
Statement $R$ is false because nitrogenase is a molybdenum-iron $(Mo-Fe)$ protein complex,not a vanadium-dependent enzyme in the context of standard biological nitrogen fixation. While some alternative nitrogenases exist,the primary nitrogenase enzyme is $Mo-Fe$ dependent.
Therefore,$S$ is true and $R$ is false.

(C) The correct answer is $C$.
Calcium $(Ca^{2+})$ is an essential mineral element required by plants.
It is specifically required for the formation of the middle lamella in cell walls and is crucial for the normal functioning of the root apical meristem.
It plays a vital role in cell division and cell elongation at the root tip,making it essential for root tip growth.

(D) $Sulphur$ is a key structural component of the vitamin $Biotin$ (Vitamin $B_7$).
It is also present in $Thiamine$ (Vitamin $B_1$).
$Biotin$ plays a crucial role in various metabolic processes, including fatty acid synthesis and gluconeogenesis.
It is commonly found in protein-rich foods such as eggs, lettuce, and sprouts.

(A) The correct option is $A$. Manganese $(Mn^{2+})$ plays a critical role in the photolysis of water during the light-dependent reactions of photosynthesis.
Photolysis is the process of splitting water molecules into hydrogen ions,electrons,and oxygen in the presence of light within the chloroplast.
$Mn^{2+}$ acts as an essential cofactor for the oxygen-evolving complex,which is necessary for this reaction to occur.

(C) : Immobilization or fixation of a nutrient means that the nutrient becomes unavailable for the plant.
The process of converting exchangeable or water-soluble potassium to its non-exchangeable or water-insoluble form is known as potassium immobilization.
Potassium is present in relatively large quantities in the soil (averaging about $1.9\%$).
Depending on the circumstances,soil potassium may be not easily available,slowly available,or readily available.
The first category accounts for $90\%$ to $98\%$ of the total soil potassium,which is only slightly soluble.
The second category constitutes $2-10\%$ of total mineral soil.
The third category makes up for about $1\%$.

(A) $Molybdenum$ is a micronutrient required in very small amounts by plants. It is essential for nodulation in legumes. It is a key component of the $Nitrate$ $reductase$ enzyme, which plays a crucial role in nitrogen fixation.

(B) The correct answer is $B$.
Macronutrients are essential elements present in plant tissues in large amounts,typically $1-10 \ mg$ per gram of dry weight.
These include carbon,hydrogen,oxygen,nitrogen,phosphorus,sulfur,potassium,calcium,and magnesium.
Micronutrients,or trace elements,are required in very small amounts,typically equal to or less than $0.1 \ mg$ per gram of dry matter.
These include iron,manganese,copper,molybdenum,zinc,boron,chlorine,and nickel.
Since magnesium is a macronutrient,it is not a micronutrient.

(B) Manganese $(Mn^{2+})$ plays a crucial role in the process of photosynthesis. Specifically,it is essential for the photolysis of water,which is the splitting of water molecules into oxygen,protons,and electrons. This reaction occurs in the thylakoid lumen and is vital for providing electrons to the electron transport chain in Photosystem $II$.

(B) $Mg$ is an essential mineral element for plants. It serves as a vital constituent of the chlorophyll molecule,forming the central atom of the porphyrin ring. Without $Mg$,chlorophyll cannot be synthesized,which directly impacts the plant's ability to perform photosynthesis. Therefore,the correct answer is $B$.

(A) : Sulphur is an essential nutrient for the growth and development of plants. It is a key component of sulphur-containing amino acids like cystine,cysteine,and methionine,which are vital for protein synthesis.
Oilseed crops,particularly those belonging to the family $Brassicaceae$ (e.g.,mustard,rapeseed),have a high requirement for sulphur because they synthesize sulphur-rich oils.
Plants absorb sulphur from the soil primarily as sulphate ions $(SO_4^{2-})$.
It is a structural component of ferredoxin and certain lipids in chloroplasts.
The characteristic pungent odour of mustard and cabbage is due to the presence of sulphur-containing oils.
Application of $40 \ kg/ha$ of sulphur in oilseed-based cropping systems significantly enhances seed yield,oil content,and protein quality.

(D) Phosphorus is a vital element for living organisms.
$1$. It is a major constituent of biological membranes,nucleic acids ($DNA$ and $RNA$),and cellular energy transfer systems (like $ATP$).
$2$. In animals,phosphorus is essential for the formation of bones and teeth (as calcium phosphate/hydroxyapatite).
$3$. It is also found in shells of certain organisms.
Therefore,all the given options are correct.

(D) Phosphorus is a vital element for living organisms.
$(1)$ Biological membranes: Phospholipids are the primary structural components of cell membranes, which contain phosphorus.
$(2)$ Nucleic acids: $DNA$ and $RNA$ contain a sugar-phosphate backbone, where phosphorus is essential.
$(3)$ Cellular energy transfer systems: $ATP$ $(Adenosine Triphosphate)$ and other high-energy compounds rely on phosphate groups for energy storage and transfer.
$(4)$ Protein synthesis: While phosphorus is involved in the transcription and translation processes (via nucleic acids and $ATP$), it is not a direct structural constituent of proteins themselves (which are made of amino acids).
Therefore, phosphorus is a major constituent of $(1)$, $(2)$, and $(3)$.

(A) In plants,elements that are actively mobilized are those that are structural components of biomolecules and are transported from older,senescing tissues to younger,developing tissues.
Elements like Nitrogen $(N)$,Phosphorus $(P)$,and Potassium $(K)$ are highly mobile within the plant body.
When these elements become deficient,the symptoms first appear in older tissues because the plant mobilizes these nutrients to the younger,growing parts.
Conversely,elements like Calcium $(Ca)$ and Sulfur $(S)$ are relatively immobile because they are structural components of cell walls or proteins and are not easily released from older tissues.

(C) In plants,essential elements are classified based on their mobility. Elements like $N$,$P$,$K$,and $Mg$ are highly mobile and are transported from older,senescing tissues to younger,developing tissues. Calcium $(Ca)$,however,is structural and is a component of the cell wall (calcium pectate). It is considered immobile or less mobile because it is not remobilized from older tissues to younger ones. Therefore,Calcium is the odd one out.

(D) Macronutrients are essential elements required by plants in large amounts (generally $10 \text{ mmol kg}^{-1}$ of dry matter).
These include Carbon $(C)$, Hydrogen $(H)$, Oxygen $(O)$, Nitrogen $(N)$, Phosphorus $(P)$, Sulphur $(S)$, Potassium $(K)$, Calcium $(Ca)$, and Magnesium $(Mg)$.
Micronutrients are required in very small amounts (less than $10 \text{ mmol kg}^{-1}$ of dry matter).
These include Iron $(Fe)$, Manganese $(Mn)$, Copper $(Cu)$, Molybdenum $(Mo)$, Zinc $(Zn)$, Boron $(B)$, Chlorine $(Cl)$, and Nickel $(Ni)$.
In option $D$, Zinc $(Zn)$, Boron $(B)$, and Chlorine $(Cl)$ are all micronutrients, not macronutrients.

(B) Boron is essential for the uptake and utilization of calcium $(Ca^{2+})$ by plants.
It plays a critical role in the translocation of calcium from the roots to the growing regions,such as the shoot apex.
$A$ deficiency of boron leads to the inhibition of calcium translocation,which causes the death of the shoot apex and the development of brittle,distorted leaves.

(B) The correct matches are as follows:
$(1)$ Nitrogen: It is a major constituent of amino acids,proteins,nucleic acids,and vitamins. Thus,$(1-q)$.
$(2)$ Phosphorus: It is a component of cell membranes,certain proteins,all nucleic acids,and nucleotides. It is required for all phosphorylation reactions. Thus,$(2-r)$.
$(3)$ Potassium: It is involved in maintaining the turgidity of cells by regulating the opening and closing of stomata and activating enzymes. Thus,$(3-s)$.
$(4)$ Calcium: It is required by meristematic and differentiating tissues. During cell division,it is used in the synthesis of the cell wall,particularly as calcium pectate in the middle lamella,and it is also involved in the formation of the mitotic spindle. Thus,$(4-p)$.
Therefore,the correct sequence is $(1-q), (2-r), (3-s), (4-p)$.

(B) Phosphorus is a vital mineral element for plants. It is a major constituent of cell membranes,all nucleic acids ($DNA$ and $RNA$),and nucleotides. It is also required for all phosphorylation reactions,which are essential for energy transfer (e.g.,$ATP$). While it is not a component of starch or glycogen,it is found in certain proteins (phosphoproteins) and coenzymes. Among the given options,option $B$ is the most accurate as phosphorus is an essential component of all nucleic acids and certain proteins.

(D) $Zn^{2+}$ (Zinc ion) acts as a crucial cofactor for several enzymes in biological systems.
Specifically, it is known to activate the enzyme $Alcohol \text{ } dehydrogenase$, which is involved in the metabolism of alcohols.
It also plays a role in the activation of carboxylases, but among the given options, $Alcohol \text{ } dehydrogenase$ is the classic example of a zinc-dependent enzyme mentioned in plant physiology contexts.
Therefore, the correct option is $D$.

(C) The correct matches are as follows:
$1$. $(a)$ Calcium is required by meristematic and differentiating tissues for cell wall formation. Thus,$(a-r)$.
$2$. $(b)$ Phosphorous is a key component of cell membranes,nucleic acids,and proteins. Thus,$(b-s)$.
$3$. $(c)$ Iron is an essential component of ferredoxin and cytochromes. Thus,$(c-p)$.
$4$. $(d)$ Manganese is involved in the splitting of water to liberate oxygen during photosynthesis and is also crucial for $N_2$-metabolism. Thus,$(d-q)$.
Therefore,the correct sequence is $(a-r), (b-s), (c-p), (d-q)$.

(A) Essential elements are classified into two categories based on their quantitative requirements: macronutrients and micronutrients.
Macronutrients are present in plant tissues in large amounts (in excess of $10 \text{ mmol kg}^{-1}$ of dry matter). These include $C, H, O, N, P, S, K, Ca,$ and $Mg$.
Micronutrients or trace elements are needed in very small amounts (less than $10 \text{ mmol kg}^{-1}$ of dry matter). These include $Fe, Mn, Cu, Mo, Zn, B, Cl,$ and $Ni$.
In option $A$, $B, Zn, Ni,$ and $Si$ are all considered micronutrients (or beneficial elements like $Si$).
Options $B, C,$ and $D$ contain macronutrients like $Mg$ and $Ca$.

(D) The water-splitting reaction (photolysis of water) in photosynthesis occurs in the thylakoid lumen of the chloroplast. This reaction is catalyzed by the Oxygen Evolving Complex $(OEC)$, which requires $Manganese$ $(Mn^{2+})$, $Calcium$ $(Ca^{2+})$, and $Chloride$ $(Cl^-)$ ions. Among the given options, $Manganese$ is the primary mineral element essential for this process. Therefore, the correct option is $D$.

(D) The correct match is $D$.
$1$. Nitrogen is a major constituent of proteins,nucleic acids,vitamins,and hormones,not primarily the cell membrane.
$2$. Phosphorus is a constituent of cell membranes (phospholipids),certain proteins,all nucleic acids,and nucleotides.
$3$. Potassium helps in maintaining the anion-cation balance in cells and is involved in protein synthesis and opening/closing of stomata.
$4$. Calcium is required by meristematic and differentiating tissues. During cell division,it is used in the synthesis of the cell wall,particularly as calcium pectate in the middle lamella,and it is also involved in the formation of the mitotic spindle.

(B) Plant nutrients are classified into two categories based on their quantitative requirements: macronutrients and micronutrients.
Macronutrients are required in large amounts (usually $ > 10 \text{ mmol kg}^{-1}$ of dry matter), such as $C, H, O, N, P, S, K, Ca, \text{ and } Mg$.
Micronutrients (or trace elements) are required in very small amounts (usually $ < 10 \text{ mmol kg}^{-1}$ of dry matter), such as $Fe, Mn, Cu, Mo, Zn, B, Cl, \text{ and } Ni$.
Among the given options, $P, Ca, \text{ and } K$ are macronutrients, while $B$ (Boron) is a micronutrient.

(A) Molybdenum $(Mo)$ is an essential micronutrient for plants.
It acts as a vital component of two key enzymes involved in nitrogen metabolism: Nitrogenase and Nitrate reductase.
Nitrogenase is responsible for biological nitrogen fixation,while Nitrate reductase is involved in the reduction of nitrate to nitrite during nitrogen assimilation.
Therefore,the correct option is $A$.

(A) $Ca^{+2}$ (Calcium) is an essential macronutrient for plants.
It is required by meristematic and differentiating tissues.
During cell division,it is used in the synthesis of the cell wall,particularly as calcium pectate in the middle lamella.
It is also involved in the normal functioning of cell membranes and acts as a cofactor for several enzymes.

(B) Many essential mineral elements are involved in the activation or inhibition of enzymes.
$K^+$ (Potassium) is essential for the activation of many enzymes,including those involved in protein synthesis and stomatal opening.
$Ca^{2+}$ (Calcium) is involved in the activation of certain enzymes and plays a role in the regulation of metabolic activities.
$Mg^{2+}$ (Magnesium) is a crucial activator for several enzymes involved in phosphate metabolism,including those in respiration and photosynthesis (e.g.,RuBisCO and $PEP$ carboxylase).
$Zn^{2+}$ (Zinc) is an essential activator for enzymes like alcohol dehydrogenase and carbonic anhydrase.
Therefore,the group $K, Ca, Mg, Zn$ is primarily concerned with the activation of various enzymes.

(C) Calcium $(Ca^{2+})$ is essential for the growth of the root tip.
It is required by meristematic and differentiating tissues.
During cell division,it is used in the synthesis of the cell wall,particularly as calcium pectate in the middle lamella.
It is also involved in the normal functioning of the cell membranes and acts as a cofactor for several enzymes.

(D) Manganese $(Mn^{2+})$ is known to compete with calcium $(Ca^{2+})$ for uptake and translocation within the plant. Specifically,an excess of manganese inhibits the translocation of calcium to the shoot apex. This can lead to calcium deficiency symptoms in the growing regions of the plant,even if calcium is present in the soil.

(C) Thiamine (Vitamin $B_1$) and biotin (Vitamin $B_7$) are essential organic compounds that function as coenzymes in various metabolic processes.
Both of these vitamins contain the element sulphur in their chemical structure.
Sulphur is a vital component of several amino acids (like cysteine and methionine) and vitamins,playing a crucial role in protein synthesis and enzymatic activity.

(B) $Magnesium$ $(Mg^{2+})$ is a vital mineral element for plants.
It acts as a central atom in the porphyrin ring structure of the chlorophyll molecule, which is essential for photosynthesis.
Additionally, it plays a crucial role in maintaining the structural integrity of ribosomes by binding the two subunits ($50S$ and $30S$ in prokaryotes or $60S$ and $40S$ in eukaryotes) together.

(C) The correct answer is $C$.
$1$. Potassium is essential for the maintenance of the turgidity of cells and the opening and closing of stomata.
$2$. Magnesium is a constituent of the ring structure of chlorophyll and helps in the synthesis of nucleic acids ($DNA$ and $RNA$).
$3$. Zinc is primarily involved in the synthesis of auxin (indole$-3-$acetic acid).
$4$. Boron is responsible for the translocation of carbohydrates. Therefore, the pair 'Zinc - Translocation of carbohydrates' is incorrect.
$5$. Copper is essential for the overall metabolism in plants and is involved in redox reactions.

(D) $Boron$ is an essential micronutrient for plants.
Its primary functions include:
$1$. $Pollen$ germination and tube growth.
$2$. Cell differentiation and development.
$3$. Carbohydrate translocation.
$4$. Calcium utilization.
Therefore,the correct option is $D$.

(A) Microelements or trace elements are those essential nutrients required by plants in very small amounts (less than $10 \text{ mmol kg}^{-1}$ of dry matter).
These include Iron $(Fe)$, Manganese $(Mn)$, Copper $(Cu)$, Molybdenum $(Mo)$, Zinc $(Zn)$, Boron $(B)$, Chlorine $(Cl)$, and Nickel $(Ni)$.
Silicon $(Si)$, Sodium $(Na)$, Cobalt $(Co)$, and Selenium $(Se)$ are also considered beneficial elements for higher plants.
In option $A$, $B$, $Zn$, $Ni$, and $Si$ are all classified as either microelements or beneficial elements, whereas other options contain macronutrients like $Mg$, $Ca$, $C$, $H$, or $N$.