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All questions of Mineral Nutrition for ACT Exam
An immobile element in plants is- a)Calcium
- b)Potassium
- c)Nitrogen
- d)Phosphorus
Correct answer is option 'A'. Can you explain this answer?
An immobile element in plants is
a)
Calcium
b)
Potassium
c)
Nitrogen
d)
Phosphorus
|
Rajeev Sharma answered |
The deficiency symptoms tend to appear first in the young tissues whenever the elements are relatively immobile and are not transported out of the mature organs. Example, calcium.
The enzyme involved in biological nitrogen fixation are- a)Carboxylase
- b)oxygenase
- c)dehydrogenase
- d)Nitrogenase
Correct answer is option 'D'. Can you explain this answer?
The enzyme involved in biological nitrogen fixation are
a)
Carboxylase
b)
oxygenase
c)
dehydrogenase
d)
Nitrogenase
|
Krish Saha answered |
The conversion of atmospheric nitrogen to ammonia by nitrogenase enzyme complex found in nitrogen-fixing bacteria(biological nitrogen fixation).
The requirement of micro nutrient are always low if the concentration increases it leads to- a)deficiency symptoms
- b)Cell differentiation
- c)Toxicity
- d)Cell elongation
Correct answer is option 'C'. Can you explain this answer?
The requirement of micro nutrient are always low if the concentration increases it leads to
a)
deficiency symptoms
b)
Cell differentiation
c)
Toxicity
d)
Cell elongation
|
Jatin Chakraborty answered |
The requirement of micronutrients is always in low amounts while their moderate decrease causes the deficiency symptoms and a moderate increase causes toxicity.
Magnesium is component of- a)Enzyme
- b)Chlorophyll
- c)Haemoglobin
- d)Florigen
Correct answer is option 'B'. Can you explain this answer?
Magnesium is component of
a)
Enzyme
b)
Chlorophyll
c)
Haemoglobin
d)
Florigen
|
Ritika Khanna answered |
It is absorbed by plants in the form of divalent Mg2+.Magnesium is a constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.
The ion which activates many enzymes involved in photosynthesis,respiration, nitrogen metabolism is- a)zinc ions
- b)manganous ions
- c)sodium ions
- d)potassium ions
Correct answer is option 'B'. Can you explain this answer?
The ion which activates many enzymes involved in photosynthesis,respiration, nitrogen metabolism is
a)
zinc ions
b)
manganous ions
c)
sodium ions
d)
potassium ions
|
Sonal Kulkarni answered |
It is absorbed in the form of manganous ions (Mn2+). Itactivates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.
Most active nitrogen fixer in Rice field is- a)Aulosira fertilissima
- b)Anabaena
- c)Rhodopseudomonas
- d)Nostoc
Correct answer is option 'A'. Can you explain this answer?
Most active nitrogen fixer in Rice field is
a)
Aulosira fertilissima
b)
Anabaena
c)
Rhodopseudomonas
d)
Nostoc
|
Shivam Kapoor answered |
Nitrogen fixation is a process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) or other nitrogen compounds that can be utilized by plants. In rice fields, nitrogen fixation is important as it helps in maintaining soil fertility and improves crop productivity. Among the various nitrogen-fixing organisms, Aulosira fertilissima is the most active nitrogen fixer in rice fields.
Explanation:
Aulosira fertilissima is a filamentous cyanobacterium that can form symbiotic associations with rice plants. It forms heterocyst, a specialized cell that fixes atmospheric nitrogen. Following are the reasons why Aulosira fertilissima is the most active nitrogen fixer in rice fields:
1. Symbiotic association: Aulosira fertilissima forms a symbiotic association with rice plants, which means it can colonize the roots of rice plants and provide them with fixed nitrogen. This association is highly specific and efficient, and it helps in maintaining soil fertility.
2. Heterocyst formation: Aulosira fertilissima can form heterocysts, which are specialized cells that are responsible for nitrogen fixation. These cells have a thick cell wall that prevents oxygen from entering, as nitrogenase, the enzyme responsible for nitrogen fixation, is highly sensitive to oxygen.
3. Efficient nitrogen fixation: Aulosira fertilissima is known for its efficient nitrogen fixation ability. It can fix up to 70 kg of nitrogen per hectare per year, which is much higher than other nitrogen-fixing organisms.
4. Tolerance to adverse conditions: Aulosira fertilissima can tolerate adverse conditions such as low pH, high salinity, and waterlogging, which are common in rice fields. This makes it a suitable candidate for nitrogen fixation in rice fields.
In conclusion, Aulosira fertilissima is the most active nitrogen fixer in rice fields due to its symbiotic association with rice plants, ability to form heterocysts, efficient nitrogen fixation, and tolerance to adverse conditions.
Explanation:
Aulosira fertilissima is a filamentous cyanobacterium that can form symbiotic associations with rice plants. It forms heterocyst, a specialized cell that fixes atmospheric nitrogen. Following are the reasons why Aulosira fertilissima is the most active nitrogen fixer in rice fields:
1. Symbiotic association: Aulosira fertilissima forms a symbiotic association with rice plants, which means it can colonize the roots of rice plants and provide them with fixed nitrogen. This association is highly specific and efficient, and it helps in maintaining soil fertility.
2. Heterocyst formation: Aulosira fertilissima can form heterocysts, which are specialized cells that are responsible for nitrogen fixation. These cells have a thick cell wall that prevents oxygen from entering, as nitrogenase, the enzyme responsible for nitrogen fixation, is highly sensitive to oxygen.
3. Efficient nitrogen fixation: Aulosira fertilissima is known for its efficient nitrogen fixation ability. It can fix up to 70 kg of nitrogen per hectare per year, which is much higher than other nitrogen-fixing organisms.
4. Tolerance to adverse conditions: Aulosira fertilissima can tolerate adverse conditions such as low pH, high salinity, and waterlogging, which are common in rice fields. This makes it a suitable candidate for nitrogen fixation in rice fields.
In conclusion, Aulosira fertilissima is the most active nitrogen fixer in rice fields due to its symbiotic association with rice plants, ability to form heterocysts, efficient nitrogen fixation, and tolerance to adverse conditions.
The most abundant element found in plants is- a)Carbon
- b)Manganese
- c)Nitrogen
- d)Iron
Correct answer is option 'A'. Can you explain this answer?
The most abundant element found in plants is
a)
Carbon
b)
Manganese
c)
Nitrogen
d)
Iron
|
Rohit Shah answered |
The essential elements can be divided into macronutrients and micronutrients. Nutrients that plants require in larger amounts are called macronutrients. About half of the essential elements are considered macronutrients: carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur. The first of these macronutrients, carbon (C), is required to form carbohydrates, proteins, nucleic acids, and many other compounds; it is, therefore, present in all macromolecules. On average, the dry weight (excluding water) of a cell is 50 percent carbon, making it a key part of plant biomolecules.
Those essential element which occur in 1-10 mg/g of dry matter are
- a)Macronutrients
- b)Micronutrients
- c)Toxic elements
- d)Beneficial nutrients
Correct answer is option 'A'. Can you explain this answer?
Those essential element which occur in 1-10 mg/g of dry matter are
a)
Macronutrients
b)
Micronutrients
c)
Toxic elements
d)
Beneficial nutrients
|
|
Rohan Singh answered |
In relatively large amounts, the soil supplies nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur; these are often called the macronutrients.
Choose the odd one out among the following (on the basis of nitrifying and denitrifying bacteria)
- a)Pseudomonas
- b)Rhizobium
- c)Azotobacter
- d)Bacillus anabaena
Correct answer is option 'A'. Can you explain this answer?
Choose the odd one out among the following (on the basis of nitrifying and denitrifying bacteria)
a)
Pseudomonas
b)
Rhizobium
c)
Azotobacter
d)
Bacillus anabaena
|
|
Rohan Singh answered |
Pseudomonas is a common bacteria found all over the world in soil, water, and plants. Some healthy people even have strains of it growing on their skin in moist parts of their body, like their armpits or genital area.
Which one of the following organism help in absorption of phosphorus from soil by plants- a)Glomus
- b)Frankia
- c)Rhizobium
- d)Anabaena
Correct answer is option 'A'. Can you explain this answer?
Which one of the following organism help in absorption of phosphorus from soil by plants
a)
Glomus
b)
Frankia
c)
Rhizobium
d)
Anabaena
|
Pooja Saha answered |
Glomus is a kind of algae found in soil. This organism help in absorption of phosphorous form soil by plants.
The nitrogen exists as two nitrogen atoms joined by- a)Di covalent bonds
- b)tetra covalent bonds
- c)triple covalent bonds
- d)monocovalent bond
Correct answer is option 'C'. Can you explain this answer?
The nitrogen exists as two nitrogen atoms joined by
a)
Di covalent bonds
b)
tetra covalent bonds
c)
triple covalent bonds
d)
monocovalent bond
|
Bhargavi Choudhury answered |
Nitrogen exists as two nitrogen atoms joined by a very strong triple covalent bond (N ≡ N).
The process of conversion of nitrogen in to ammonia is known as- a)industrial nitrogen fixation
- b)Electrical nitrogen fixation
- c)Biological nitrogen fixation
- d)Denitrification
Correct answer is option 'C'. Can you explain this answer?
The process of conversion of nitrogen in to ammonia is known as
a)
industrial nitrogen fixation
b)
Electrical nitrogen fixation
c)
Biological nitrogen fixation
d)
Denitrification
|
|
Rohit Shah answered |
In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll. As chlorophyll is responsible for the green color of leaves, chlorotic leaves are pale, yellow, or yellow-white. ... Chlorosis is derived from the Greek khloros meaning 'greenish-yellow', 'pale green', 'pale', 'pallid', or 'fresh'.
Hydroponics refers to growing plant in- a)Solution of mineral nutrients
- b)Tissue culture medium
- c)Water
- d)Soil culture
Correct answer is option 'A'. Can you explain this answer?
Hydroponics refers to growing plant in
a)
Solution of mineral nutrients
b)
Tissue culture medium
c)
Water
d)
Soil culture
|
Kunal Rane answered |
The technique of growing plants in a nutrient solution is known as hydroponics.
Sulphur is important nutrient for optimum growth and productivity of- a)Pulse
- b)Cereals
- c)Fibre crops
- d)Oil crops
Correct answer is option 'A'. Can you explain this answer?
Sulphur is important nutrient for optimum growth and productivity of
a)
Pulse
b)
Cereals
c)
Fibre crops
d)
Oil crops
|
Jyoti Kapoor answered |
Pulse crops
Sulphur is constituent of certain amino acids. The amino acids form the protein by polymerisation. The pulses are rich in protein.
Which one is prerequisite for nitrogen fixation?- a)Oxygen deficiency
- b)Nitrate deficiency
- c)Nitrite deficiency
- d)Ammonia deficiency
Correct answer is option 'B'. Can you explain this answer?
Which one is prerequisite for nitrogen fixation?
a)
Oxygen deficiency
b)
Nitrate deficiency
c)
Nitrite deficiency
d)
Ammonia deficiency
|
Shanaya Rane answered |
During nitrogen fixation atmospheric nitrogen is converted into nitrates and nitrites. When deficiency of nitrate occurs in soil, nitrogen fixation occurs. So, nitrate deficiency is prerequisite for nitrogen fixation.
Amino acid derivatives in which –OH component of carboxylic group is replaced by another amino group are called- a)Glycosides
- b)Ureides
- c)Amides
- d)Peptides
Correct answer is option 'C'. Can you explain this answer?
Amino acid derivatives in which –OH component of carboxylic group is replaced by another amino group are called
a)
Glycosides
b)
Ureides
c)
Amides
d)
Peptides
|
Mehul Iyer answered |
Amides are obtained from the replacement of –OH component of carboxylic group of amino acid by another amino group
Grey spots of Oat are due to deficiency of- a)Zn
- b)Cu
- c)Mn
- d)Fe
Correct answer is option 'C'. Can you explain this answer?
Grey spots of Oat are due to deficiency of
a)
Zn
b)
Cu
c)
Mn
d)
Fe
|
|
Jyoti Kapoor answered |
Grey spots of oat are caused by deficiency of manganese (Mn). It is a trace element, required in very small amount. Manganese exists in the soil in the form of bivalents, trivalents.
Influx and efflux of H+ ions inside the cell change the- a)Na+ ion concentration
- b)Nitrate concentration
- c)pH
- d)Permeability of plasma membrane
Correct answer is option 'C'. Can you explain this answer?
Influx and efflux of H+ ions inside the cell change the
a)
Na+ ion concentration
b)
Nitrate concentration
c)
pH
d)
Permeability of plasma membrane
|
Hansa Sharma answered |
pH of a solution is depends upon hydrogen ions concentration. Influx and efflux of H+ ions inside the cell change the pH of solution present in soil.
Zn2+ is an activator of- a)Nitrogenase
- b)Oxygenase
- c)alcohol dehydrogenase
- d)phosphoenolpyruvate carboxylase
Correct answer is option 'C'. Can you explain this answer?
Zn2+ is an activator of
a)
Nitrogenase
b)
Oxygenase
c)
alcohol dehydrogenase
d)
phosphoenolpyruvate carboxylase
|
Rohan Unni answered |
Zn2+ is an activator of alcohol dehydrogenase and Mo of nitrogenase during nitrogen metabolism.
The process of decomposition organic nitrogen into ammonia is known as- a)Biological nitrogen fixation
- b)Denitrification
- c)Ammonification
- d)nitrification
Correct answer is option 'C'. Can you explain this answer?
The process of decomposition organic nitrogen into ammonia is known as
a)
Biological nitrogen fixation
b)
Denitrification
c)
Ammonification
d)
nitrification
|
Aravind Saha answered |
Ammonification refers to any chemical reaction in which amine groups are converted into ammonia or its ionic form, ammonium as an end product. Bacteria and related microorganisms derive metabolically useful energy from the oxidation of organic nitrogen to ammonium.
It is the technique of growing plants in above-ground strands provided with fine mist of normal solution.- a)Chemoponics
- b)Hydroponics
- c)Hygroponics
- d)Aeroponics
Correct answer is option 'D'. Can you explain this answer?
It is the technique of growing plants in above-ground strands provided with fine mist of normal solution.
a)
Chemoponics
b)
Hydroponics
c)
Hygroponics
d)
Aeroponics
|
Sushant Goyal answered |
Aeroponics is the technique of growing plants in above ground strands provided with fine mist of normal solution. It is used to know the deficiency symptoms of minerals.
The elements involved in delay of flowering if their concentration is low are- a)N,S,K
- b)N,S,Mo
- c)N,S,P
- d)N,S,Mn
Correct answer is option 'B'. Can you explain this answer?
The elements involved in delay of flowering if their concentration is low are
a)
N,S,K
b)
N,S,Mo
c)
N,S,P
d)
N,S,Mn
|
Manisha Patel answered |
Ans.
The deficiency symptoms of nitrogen, potassium and magnesium are visible first in the senescent leaves. ... Some elements like N, S, Mo delay flowering if their concentration in plants is low.
Nitrification involves- a)NH4+ and NO3−
- b)NH3 and NO−2
- c)NH3 and NH4
- d)All of above
Correct answer is option 'B'. Can you explain this answer?
Nitrification involves
a)
NH4+ and NO3−
b)
NH3 and NO−2
c)
NH3 and NH4
d)
All of above
|
Sarthak Saini answered |
Ammonia is first oxidised to nitrite by the bacteria Nitrosomonasand/or Nitrococcus. The nitrite is further oxidised to nitrate with the help of thebacterium Nitrobacter Pseudomonas.
Element required for germination of pollen grain is- a)Potassium
- b)Boron
- c)Calcium
- d)Chlorine
Correct answer is option 'B'. Can you explain this answer?
Element required for germination of pollen grain is
a)
Potassium
b)
Boron
c)
Calcium
d)
Chlorine
|
Lekshmi Banerjee answered |
Elements play important role in completing life cycles of plants. Element required for germination of pollen grain is Boron.
Main role of minor elements is to act as- a)Binder for cell structure
- b)Constituent of amino acids
- c)Constituent of hormones
- d)Cofactor of enzyme
Correct answer is option 'D'. Can you explain this answer?
Main role of minor elements is to act as
a)
Binder for cell structure
b)
Constituent of amino acids
c)
Constituent of hormones
d)
Cofactor of enzyme
|
Muskaan Basak answered |
Micronutrients are required in very small quantity. The main role of micronutrients is to act as cofactor of enzyme. Co-factors increase the efficiency of enzymes.
Plant with zinc deficiency show reduced biosynthesis of- a)Ethylene
- b)Abscisic acid
- c)Cytokinin
- d)Auxin
Correct answer is option 'D'. Can you explain this answer?
Plant with zinc deficiency show reduced biosynthesis of
a)
Ethylene
b)
Abscisic acid
c)
Cytokinin
d)
Auxin
|
Shivani Rane answered |
Plants obtain zinc as Zn2+ ions. It activates various enzymes,especially carboxylases. It is also needed in the synthesis of auxin.If there is deficiency in zinc to plants then it leads to reduced synthesis of auxin.
Name the best known symbiotic nitrogen fixing bacterium is- a)Nitrobacter
- b)Azotobactor
- c)Rhizobium
- d)Nitrosomonas
Correct answer is option 'C'. Can you explain this answer?
Name the best known symbiotic nitrogen fixing bacterium is
a)
Nitrobacter
b)
Azotobactor
c)
Rhizobium
d)
Nitrosomonas
|
Dipika Das answered |
N2−fixing bacteria, especially roots of legumes, can fix this atmospheric nitrogen into biologically usable forms. Nitrogen fixation requires a strong reducing agent and energy in the form of ATP. Nitrogen-fixation is accomplished with the help of nitrogenfixingmicrobes mainly rhizobium.
Micronutrients are otherwise called as- a)Beneficial elements
- b)Trace elements
- c)Mineral elements
- d)Structural elements
Correct answer is option 'B'. Can you explain this answer?
Micronutrients are otherwise called as
a)
Beneficial elements
b)
Trace elements
c)
Mineral elements
d)
Structural elements
|
Mrinalini Bajaj answered |
Micronutrients or trace elements, are needed in very small amounts(less than 10 mole Kg –1 of dry matter). These include iron, manganese, copper, molybdenum, zinc, boron, chlorine and nickel.
Which among the following is NOT the source of nitrogen?- a)Automobile exhaust
- b)Xylem
- c)Industrial combustion
- d)forest fire
Correct answer is option 'B'. Can you explain this answer?
Which among the following is NOT the source of nitrogen?
a)
Automobile exhaust
b)
Xylem
c)
Industrial combustion
d)
forest fire
|
Vandana Yadav answered |
Explanation:
Source of Nitrogen:
Nitrogen is an essential element required for the growth and development of living organisms. It is a major component of proteins, nucleic acids, and other important biomolecules. Nitrogen is obtained by organisms through various sources in the environment. Among the given options, the source of nitrogen that is NOT correct is option 'B', which is xylem.
Automobile Exhaust:
Automobile exhaust is a major source of nitrogen pollution in the environment. Nitrogen oxides (NOx) are released from the combustion of fossil fuels in vehicles, which includes nitrogen as one of its components. These nitrogen oxides contribute to air pollution and can have detrimental effects on human health and the environment.
Industrial Combustion:
Industrial combustion processes, such as those in power plants and factories, release nitrogen-containing compounds into the atmosphere. These compounds are often in the form of nitrogen oxides (NOx), which are emitted during the burning of fossil fuels. The release of nitrogen oxides from industrial combustion contributes to air pollution and can lead to the formation of smog and acid rain.
Forest Fire:
Forest fires can release large amounts of nitrogen into the atmosphere. Nitrogen is present in vegetation and organic matter, and when these materials burn, nitrogen compounds are released as gases. These nitrogen compounds can contribute to air pollution and can have both short-term and long-term effects on the environment.
Xylem:
Xylem is a vascular tissue in plants responsible for the transport of water and minerals from the roots to the rest of the plant. While xylem plays a crucial role in water and mineral transport, it is not a source of nitrogen. Nitrogen is typically obtained by plants through the roots in the form of nitrates or ammonium ions from the soil.
In conclusion, among the given options, xylem is NOT a source of nitrogen. Nitrogen can be obtained from automobile exhaust, industrial combustion, and forest fires, but not from xylem.
Source of Nitrogen:
Nitrogen is an essential element required for the growth and development of living organisms. It is a major component of proteins, nucleic acids, and other important biomolecules. Nitrogen is obtained by organisms through various sources in the environment. Among the given options, the source of nitrogen that is NOT correct is option 'B', which is xylem.
Automobile Exhaust:
Automobile exhaust is a major source of nitrogen pollution in the environment. Nitrogen oxides (NOx) are released from the combustion of fossil fuels in vehicles, which includes nitrogen as one of its components. These nitrogen oxides contribute to air pollution and can have detrimental effects on human health and the environment.
Industrial Combustion:
Industrial combustion processes, such as those in power plants and factories, release nitrogen-containing compounds into the atmosphere. These compounds are often in the form of nitrogen oxides (NOx), which are emitted during the burning of fossil fuels. The release of nitrogen oxides from industrial combustion contributes to air pollution and can lead to the formation of smog and acid rain.
Forest Fire:
Forest fires can release large amounts of nitrogen into the atmosphere. Nitrogen is present in vegetation and organic matter, and when these materials burn, nitrogen compounds are released as gases. These nitrogen compounds can contribute to air pollution and can have both short-term and long-term effects on the environment.
Xylem:
Xylem is a vascular tissue in plants responsible for the transport of water and minerals from the roots to the rest of the plant. While xylem plays a crucial role in water and mineral transport, it is not a source of nitrogen. Nitrogen is typically obtained by plants through the roots in the form of nitrates or ammonium ions from the soil.
In conclusion, among the given options, xylem is NOT a source of nitrogen. Nitrogen can be obtained from automobile exhaust, industrial combustion, and forest fires, but not from xylem.
The morphological changes are indicative ofcertain element deficiencies and are called- a)Mineral nutrition
- b)Protein synthesis
- c)Translocation
- d)deficiency symptom
Correct answer is option 'D'. Can you explain this answer?
The morphological changes are indicative ofcertain element deficiencies and are called
a)
Mineral nutrition
b)
Protein synthesis
c)
Translocation
d)
deficiency symptom
|
Prashanth Dasgupta answered |
Explanation:The morphological changes are indicative of certain element deficiencies and are called deficiency symptoms.
Element present in middle lamella- a)Cu
- b)Zn
- c)Ca
- d)K
Correct answer is option 'C'. Can you explain this answer?
Element present in middle lamella
a)
Cu
b)
Zn
c)
Ca
d)
K
|
Pallabi Reddy answered |
Calcium is required by meristematic and differentiating tissues. During cell division it is used in the synthesis of cell wall, particularly as calcium pectate in the middle lamella.
Biological nitrogen fixation was discovered by- a)Gericke
- b)Nehar and Sakmann
- c)Liebig
- d)Winograndsky
Correct answer is option 'D'. Can you explain this answer?
Biological nitrogen fixation was discovered by
a)
Gericke
b)
Nehar and Sakmann
c)
Liebig
d)
Winograndsky
|
Vaibhav Basu answered |
Sergei Winogradsky discovered the biological nitrogen fixation during which atmospheric nitrogen is converted into nitrates and nitrite.
Minerals present in the soil are absorbed by- a)stems
- b)leaf
- c)roots
- d)buds
Correct answer is option 'C'. Can you explain this answer?
Minerals present in the soil are absorbed by
a)
stems
b)
leaf
c)
roots
d)
buds
|
Ishani Nambiar answered |
Most of the minerals present in soil can enter plants through roots.
Function of laghaemoglobin during biological nitrogen fixation in root nodules of legumes is to- a)Protect nitrogenase from Oxygen
- b)Transport Oxygen for nitrogenase activity
- c)Convert ammonium into nitrite
- d)Convert N2 to NH3
Correct answer is option 'A'. Can you explain this answer?
Function of laghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
a)
Protect nitrogenase from Oxygen
b)
Transport Oxygen for nitrogenase activity
c)
Convert ammonium into nitrite
d)
Convert N2 to NH3
|
|
Jyoti Kapoor answered |
Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. ... Nitrogen fixation in the nodule is very oxygen sensitive.
Non-symbiotic nitrogen fixing prokaryote is- a)Frankia
- b)Acetobacter
- c)Rhizobium
- d)Azotobacter
Correct answer is option 'D'. Can you explain this answer?
Non-symbiotic nitrogen fixing prokaryote is
a)
Frankia
b)
Acetobacter
c)
Rhizobium
d)
Azotobacter
|
Naveen Menon answered |
Most of the prokaryotic nitrogen fixing prokaryotes are symbiotic in nature. Azatobacter is bacteria is non-symbiotic nitrogen fixing prokaryote.
Who proposed the idea that plants require essential minerals?- a)Bernand Simpson
- b)Aristotle
- c)Von Haier
- d)Arnon and Stout
Correct answer is option 'D'. Can you explain this answer?
Who proposed the idea that plants require essential minerals?
a)
Bernand Simpson
b)
Aristotle
c)
Von Haier
d)
Arnon and Stout
|
Orion Classes answered |
Arnon and Stout proposed that plants require essential minerals. They put forward their research on essential elements in 1939. They also came up with certain criteria that make an element for the plant body.
Mineral absorption into the plant is always against the concentration gradient and use ATP as source of energy, it is an / a
- a)Both Active and Passive
- b)Inactive process
- c)Active process
- d)Passive process
Correct answer is option 'C'. Can you explain this answer?
Mineral absorption into the plant is always against the concentration gradient and use ATP as source of energy, it is an / a
a)
Both Active and Passive
b)
Inactive process
c)
Active process
d)
Passive process
|
|
Rajat Kapoor answered |
Mineral absorption into the plant is always against the concentration gradient and use ATP molecules as source of energy is an active process. As concentration of minerals are always higher in cell than soil.
Analysis of xylem sap shows- a)presence of enzymes
- b)presence of organic matter
- c)presence of nutrients
- d)presence of mineral salts
Correct answer is option 'D'. Can you explain this answer?
Analysis of xylem sap shows
a)
presence of enzymes
b)
presence of organic matter
c)
presence of nutrients
d)
presence of mineral salts
|
Anirudh Datta answered |
Mineral salts are translocated through xylem along with the ascending stream of water, which is pulled up through the plant by transpirational pull.
Which two minerals are not needed by the majority of plants but very much needed by almost all animals?- a)Carbon and Calcium
- b)Oxygen and Nitrogen
- c)Sodium and Magnesium
- d)Sodium and Iodine
Correct answer is option 'D'. Can you explain this answer?
Which two minerals are not needed by the majority of plants but very much needed by almost all animals?
a)
Carbon and Calcium
b)
Oxygen and Nitrogen
c)
Sodium and Magnesium
d)
Sodium and Iodine
|
Pankaj Banerjee answered |
Sodium and Iodine minerals are not needed by the majority of plants but sodium and iodine minerals are very much needed by almost all animals. Sodium play important role in nervous system and iodine for synthesis thyroxine hormone.
Which is an important constituent of protein involved in transfer of electrons?- a)biotin
- b)Coenzyme A
- c)Thiamine
- d)ferredoxin
Correct answer is option 'D'. Can you explain this answer?
Which is an important constituent of protein involved in transfer of electrons?
a)
biotin
b)
Coenzyme A
c)
Thiamine
d)
ferredoxin
|
Krish Chakraborty answered |
Plants obtain iron in the form of ferric ions (Fe3+). It is required in larger amounts in comparison to other micronutrients. It is an important constituent of proteins involved in the transfer of electrons like ferredoxin.
Which one is not a reason of mineral depletion in the soil?- a)Use of high yielding varieties
- b)Growing leguminous plants
- c)Leeching of minerals
- d)Non-rotation of crops
Correct answer is option 'B'. Can you explain this answer?
Which one is not a reason of mineral depletion in the soil?
a)
Use of high yielding varieties
b)
Growing leguminous plants
c)
Leeching of minerals
d)
Non-rotation of crops
|
Harshitha Dey answered |
Mineral deficiency is soil may be due to use of high yielding varieties, non-rotation of crops and leeching of minerals. Growing leguminous plants do not deplete the mineral in soil.
Phosphorous is a constituent of A.Cell membrane B.Nucleic acids C.cellwallD.chlorophyll- a)C and D
- b)Aand B
- c)B and C
- d)D and A
Correct answer is option 'B'. Can you explain this answer?
Phosphorous is a constituent of A.Cell membrane B.Nucleic acids C.cellwallD.chlorophyll
a)
C and D
b)
Aand B
c)
B and C
d)
D and A
|
Ameya Khanna answered |
Phosphorus is an essential element found in living organisms and plays a crucial role in various biological processes. It is mainly found in the form of phosphate ions (PO4^3-) in biological systems. Phosphorus is a constituent of nucleic acids and cell membranes, making option B the correct answer.
Cell Membrane:
- The cell membrane is a selectively permeable barrier that surrounds the cell, separating its internal environment from the external environment.
- Phospholipids, the main components of the cell membrane, consist of a hydrophilic phosphate head and hydrophobic fatty acid tails.
- The phosphate group of the phospholipid contains phosphorus, making phosphorus a constituent of the cell membrane.
Nucleic Acids:
- Nucleic acids, including DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are essential molecules that store and transmit genetic information.
- Phosphorus is a key component of nucleotides, the building blocks of nucleic acids.
- The phosphate group in nucleotides contains phosphorus, contributing to the structure and function of nucleic acids.
Cell Wall:
- The cell wall is a rigid structural layer found in plants, bacteria, fungi, and some protists.
- While the cell wall contains various components like cellulose, chitin, or peptidoglycan depending on the organism, phosphorus is not a primary constituent of the cell wall.
Chlorophyll:
- Chlorophyll is a pigment found in plants and algae that plays a critical role in photosynthesis, the process by which plants convert light energy into chemical energy.
- Chlorophyll molecules contain a porphyrin ring structure with a central magnesium ion, but no phosphorus.
In conclusion, phosphorus is a constituent of cell membranes and nucleic acids, making option B the correct answer. While phosphorus is not a primary constituent of the cell wall or chlorophyll, it is still an essential nutrient for all living organisms.
Cell Membrane:
- The cell membrane is a selectively permeable barrier that surrounds the cell, separating its internal environment from the external environment.
- Phospholipids, the main components of the cell membrane, consist of a hydrophilic phosphate head and hydrophobic fatty acid tails.
- The phosphate group of the phospholipid contains phosphorus, making phosphorus a constituent of the cell membrane.
Nucleic Acids:
- Nucleic acids, including DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are essential molecules that store and transmit genetic information.
- Phosphorus is a key component of nucleotides, the building blocks of nucleic acids.
- The phosphate group in nucleotides contains phosphorus, contributing to the structure and function of nucleic acids.
Cell Wall:
- The cell wall is a rigid structural layer found in plants, bacteria, fungi, and some protists.
- While the cell wall contains various components like cellulose, chitin, or peptidoglycan depending on the organism, phosphorus is not a primary constituent of the cell wall.
Chlorophyll:
- Chlorophyll is a pigment found in plants and algae that plays a critical role in photosynthesis, the process by which plants convert light energy into chemical energy.
- Chlorophyll molecules contain a porphyrin ring structure with a central magnesium ion, but no phosphorus.
In conclusion, phosphorus is a constituent of cell membranes and nucleic acids, making option B the correct answer. While phosphorus is not a primary constituent of the cell wall or chlorophyll, it is still an essential nutrient for all living organisms.
In plant, nitrate is reduced to ammonia state in two steps. In second step electrons are donated by- a)Nitrite reductase
- b)Cytochrome b5
- c)Ferredoxin
- d)Nitrate reductase
Correct answer is option 'C'. Can you explain this answer?
In plant, nitrate is reduced to ammonia state in two steps. In second step electrons are donated by
a)
Nitrite reductase
b)
Cytochrome b5
c)
Ferredoxin
d)
Nitrate reductase
|
Vijay Bansal answered |
Ferredoxins are iron-sulfur proteins that mediate electron transfer in a range of metabolic reactions. The term "ferredoxin" was coined by D.C. he plant-type ferredoxins (Fds) are the [2Fe-2S] proteins that function primarily in photosynthesis; they transfer electrons from photoreduced Photosystem I to ferredoxin NADP(+) reductase in which NADPH is produced for CO(2) assimilation.
Entry of ions into cells is called- a)Out flow
- b)Outflux
- c)Influx
- d)Inflow
Correct answer is option 'C'. Can you explain this answer?
Entry of ions into cells is called
a)
Out flow
b)
Outflux
c)
Influx
d)
Inflow
|
Pritam Chawla answered |
Influx of ions into cells:
Influx of ions refers to the process of ions entering into the cells. It is an essential biological process that helps in maintaining the normal functioning of cells. The movement of ions across the cell membrane is a critical process that is necessary for several cellular functions such as:
- Regulation of ion concentration
- Membrane potential
- Signal transduction
- Muscle contraction
- Nerve transmission
- Metabolism
Mechanism of ion influx:
The influx of ions into cells occurs through various channels and transporters present on the cell membrane. The cell membrane is selectively permeable, meaning it allows the passage of certain ions and molecules through it. The following are the mechanisms involved in the influx of ions into cells:
- Diffusion: It is the movement of ions from an area of high concentration to an area of low concentration. It occurs through simple diffusion or facilitated diffusion.
- Active transport: It is the movement of ions against the concentration gradient, i.e., from an area of low concentration to an area of high concentration. It requires energy in the form of ATP and occurs through pumps such as Na+/K+ ATPase pump.
- Ion channels: They are selective pores present on the cell membrane that allow the passage of specific ions through them. They are of two types, i.e., ligand-gated ion channels and voltage-gated ion channels.
Consequences of ion influx:
The influx of ions into cells plays a crucial role in several cellular processes. However, excessive influx of ions can lead to several pathological conditions such as:
- Excitotoxicity
- Oxidative stress
- Mitochondrial dysfunction
- Apoptosis
Conclusion:
Influx of ions is an essential biological process that helps in maintaining the normal functioning of cells. It occurs through various mechanisms such as diffusion, active transport, and ion channels. The excessive influx of ions can lead to several pathological conditions.
Influx of ions refers to the process of ions entering into the cells. It is an essential biological process that helps in maintaining the normal functioning of cells. The movement of ions across the cell membrane is a critical process that is necessary for several cellular functions such as:
- Regulation of ion concentration
- Membrane potential
- Signal transduction
- Muscle contraction
- Nerve transmission
- Metabolism
Mechanism of ion influx:
The influx of ions into cells occurs through various channels and transporters present on the cell membrane. The cell membrane is selectively permeable, meaning it allows the passage of certain ions and molecules through it. The following are the mechanisms involved in the influx of ions into cells:
- Diffusion: It is the movement of ions from an area of high concentration to an area of low concentration. It occurs through simple diffusion or facilitated diffusion.
- Active transport: It is the movement of ions against the concentration gradient, i.e., from an area of low concentration to an area of high concentration. It requires energy in the form of ATP and occurs through pumps such as Na+/K+ ATPase pump.
- Ion channels: They are selective pores present on the cell membrane that allow the passage of specific ions through them. They are of two types, i.e., ligand-gated ion channels and voltage-gated ion channels.
Consequences of ion influx:
The influx of ions into cells plays a crucial role in several cellular processes. However, excessive influx of ions can lead to several pathological conditions such as:
- Excitotoxicity
- Oxidative stress
- Mitochondrial dysfunction
- Apoptosis
Conclusion:
Influx of ions is an essential biological process that helps in maintaining the normal functioning of cells. It occurs through various mechanisms such as diffusion, active transport, and ion channels. The excessive influx of ions can lead to several pathological conditions.
Chlorosis is referred as- a)Death of tissue
- b)Premature fall of leaves
- c)Inhibition of cell division
- d)Loss of chlorophyll
Correct answer is option 'D'. Can you explain this answer?
Chlorosis is referred as
a)
Death of tissue
b)
Premature fall of leaves
c)
Inhibition of cell division
d)
Loss of chlorophyll
|
|
Rohit Shah answered |
In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll. As chlorophyll is responsible for the green color of leaves, chlorotic leaves are pale, yellow, or yellow-white. ... Chlorosis is derived from the Greek khloros meaning 'greenish-yellow', 'pale green', 'pale', 'pallid', or 'fresh'.
Deficiency of which element leads to dark green colouration of leaves?- a)Sodium
- b)Phosphorus
- c)Potassium
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
Deficiency of which element leads to dark green colouration of leaves?
a)
Sodium
b)
Phosphorus
c)
Potassium
d)
None of the above
|
Everly Young answered |
Phosphorus deficiency causing dark green colouration of leaves
Phosphorus is an essential nutrient for plant growth and development, playing a crucial role in energy transfer, photosynthesis, and respiration. When plants lack an adequate amount of phosphorus, they exhibit certain symptoms, one of which is the dark green colouration of leaves.
Reason for dark green leaves
- Phosphorus deficiency can lead to dark green leaves due to its impact on chlorophyll production. Chlorophyll is responsible for the green colour in plants, and phosphorus deficiency can disrupt the synthesis of chlorophyll, resulting in darker green leaves.
Symptoms of phosphorus deficiency
- In addition to dark green leaves, other symptoms of phosphorus deficiency include stunted growth, reduced flowering, and poor fruit development. Plants may also exhibit purplish discolouration on leaves.
Important role of phosphorus
- Phosphorus is crucial for the overall health and vitality of plants. It helps in root development, nutrient uptake, and overall plant metabolism. Therefore, ensuring an adequate supply of phosphorus is essential for optimal plant growth.
In conclusion, a deficiency of phosphorus can lead to dark green colouration of leaves in plants due to its impact on chlorophyll production and overall plant health. It is important to address phosphorus deficiency through proper fertilization and soil management practices to maintain healthy and vibrant plant growth.
Phosphorus is an essential nutrient for plant growth and development, playing a crucial role in energy transfer, photosynthesis, and respiration. When plants lack an adequate amount of phosphorus, they exhibit certain symptoms, one of which is the dark green colouration of leaves.
Reason for dark green leaves
- Phosphorus deficiency can lead to dark green leaves due to its impact on chlorophyll production. Chlorophyll is responsible for the green colour in plants, and phosphorus deficiency can disrupt the synthesis of chlorophyll, resulting in darker green leaves.
Symptoms of phosphorus deficiency
- In addition to dark green leaves, other symptoms of phosphorus deficiency include stunted growth, reduced flowering, and poor fruit development. Plants may also exhibit purplish discolouration on leaves.
Important role of phosphorus
- Phosphorus is crucial for the overall health and vitality of plants. It helps in root development, nutrient uptake, and overall plant metabolism. Therefore, ensuring an adequate supply of phosphorus is essential for optimal plant growth.
In conclusion, a deficiency of phosphorus can lead to dark green colouration of leaves in plants due to its impact on chlorophyll production and overall plant health. It is important to address phosphorus deficiency through proper fertilization and soil management practices to maintain healthy and vibrant plant growth.
Which element essential for photolysis of water?- a)Nitrogen
- b)Carbon
- c)Chlorine
- d)Oxygen
Correct answer is option 'C'. Can you explain this answer?
Which element essential for photolysis of water?
a)
Nitrogen
b)
Carbon
c)
Chlorine
d)
Oxygen
|
Anu Bajaj answered |
Chlorine is absorbed in the form of chloride anion (Cl–). Along with it Na+ and K+, it helps in determining the solute concentration and the anioncation balance in cells. It is essential for the water-splitting reaction in photosynthesis.
Which one of the following mineral elements plays an in biological nitrogen fixation?- a)Copper
- b)Manganese
- c)Zinc
- d)Molybdenum
Correct answer is option 'D'. Can you explain this answer?
Which one of the following mineral elements plays an in biological nitrogen fixation?
a)
Copper
b)
Manganese
c)
Zinc
d)
Molybdenum
|
|
Rajat Kapoor answered |
Iron, Molybdenum as well as Phosphorous play important role in BNF. Nitrogen fixation needs an enzyme called nitrogenase. The nitrogenase enzyme has two kinds of proteins viz. Iron Protein, and Iron-Molybdenum protein.
Which wild type organism doesn’t need any additional supplements for growth?- a)Prototroph
- b)Autotroph
- c)Auxotroph
- d)Phenotype
Correct answer is option 'A'. Can you explain this answer?
Which wild type organism doesn’t need any additional supplements for growth?
a)
Prototroph
b)
Autotroph
c)
Auxotroph
d)
Phenotype
|
|
Orion Classes answered |
Prototroph doesn’t require any organic nutrients to make their food and grow. They are self sufficient and can synthesize their food using organic nutrients. Nutrientional requirements of prototroph are similar to wild type. They can grow without aid from additional supplements.
What characteristic is not necessary to consider a nutrient essential?- a)The element does not grow and develop the body
- b)Element is part of metabolic processes in plant
- c)Another element cannot perform the same function
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
What characteristic is not necessary to consider a nutrient essential?
a)
The element does not grow and develop the body
b)
Element is part of metabolic processes in plant
c)
Another element cannot perform the same function
d)
None of the above
|
|
Orion Classes answered |
An essential element is necessary for growth and development of the plant body. Such elements cannot be replaced by other elements as they have a very specific functions required by the plant. Essential elements have contribution in metabolic processes that take place in plant’s body.
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