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CBSE Questions for Class 11 Medical Biology Mineral Nutrition Quiz 6 - MCQExams.com
CBSE
Class 11 Medical Biology
Mineral Nutrition
Quiz 6
Which of the following is a micronutrient?
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Nitrogen
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Phosphorus
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Potassium
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Zinc
Explanation
There are sixteen nutrients which are essential for plants. They are classified as:
(i) Macronutrients: nitrogen, phosphorus, potassium, calcium, magnesium, sulphur
(ii) Micronutrients: iron, manganese, boron, zinc, copper, molybdenum, chlorine.
So, the correct answer is '
Zinc'
Which of the following is a micro-nutrient?
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Copper
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Phosphorous
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Magnesium
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Calcium
Explanation
Micronutrients are those nutrients which are required in a small quantity to the plants. They include microelements and vitamins or trace elements like copper, iron, cobalt, zinc, boron etc.
So, the correct option is 'Copper'.
Nutrients which are required in large quantities are called as
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Macronutrients
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Micronutrients
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Secondary nutrients
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None of the above
Explanation
Nutrients which are required in large quantities are called as macronutrients.
Primary (macro) nutrients are nitrogen, phosphorus and potassium. They are the most frequently required in a crop fertilization program. Also, they are need in the greatest total quantity by plants as fertilizer.
Thus, the correct answer is option A.
Which of the following are not in the category of micro nutrients?
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$$Zn, Mn$$
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$$B, Cu$$
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$$Cl, Ni$$
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$$K, S$$
Explanation
Micro nutrients are the type of nutrients which are required in less amount to the plants. They include iron, cobalt, copper, zinc, chlorine etc. They provide extra-nutrients to the plant which help for their better survival.
So, the correct option is 'K, S '.
Which of the following minerals activate the enzymes involved in respiration?
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Nitrogen and phosphorus
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Magnesium and manganese
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Potassium and calcium
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Sulphur and iron
Explanation
Magnesium and manganese are the elements responsible for activation of enzymes.
Nitrogen, Sulphur and Phosphorus are used for synthesis of biomolecules.
Potassium is used for osmoregulation.
Calcium and Iron are important structural components.
So the correct answer is 'Magnesium and Manganese'.
Active transport of ions by the cell requires
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High temperature
0%
ATP
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Alkaline pH
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Salts
Explanation
Whenever active transport is being carried out energy is required and ATP is used up as it is the energy currency of the cell.
High temperature, Alkaline pH or Salts cannot carry out active transport as it involves movement of a substance against it's concentration gradient.
So, the correct answer is 'ATP'
Nitrogen-fixing bacteria are important because
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They turn nitrogen from the air into nitrogen compounds in the soil
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They are essential for plants being able to carry out photosynthesis
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They break up dead plants and animals in the soil
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They release excess nitrogen from the soil into the atmosphere
Explanation
Cells are built out of protein molecules; these are organic molecules built around carbon and nitrogen. To grow, plants need protein, and for this plants need nitrogen. Nitrogen is a very essential element and is found in the various forms like the proteins, nucleic acids (DNA & RNA ) some vitamins, alkaloids, and urea. Plants cannot absorb atmospheric nitrogen but Nitrogen-fixing bacteria take atmospheric nitrogen (
N
2
N2
) and convert it to nitrates (
N
O
NO
) in the soil. This is then absorbed by plants.
So, the correct answer is '
They turn nitrogen from the air into nitrogen compounds in the soil'.
Nutrient which are required in small quantities are called as
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Macronutrients
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Micronutrients
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Primary nutrients
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None of the above
Explanation
A nutrient which is required in small quantities is called as a micronutrient.
The micronutrients are boron, chlorine, copper, iron, manganese, molybdenum and zinc. These plant food elements are used in very small amounts, but they are just as important to plant development and profitable crop production as the major nutrients. Especially, they work "behind the scene" as activators of many plant functions.
Thus, the correct answer is '
Micronutrients'.
Which of the following is macronutrient?
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Iron
0%
Manganese
0%
Boron
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Calcium
Explanation
There are sixteen nutrients which are essential for plants which are divided into macro and micro nutrients.
(i) Macronutrients: Macronutrients are nutrients that provide calories or energy. For example, nitrogen, phosphorus, potassium, calcium, magnesium, sulphur.
(ii) Micronutrients: They are are organic compounds required as nutrients in tiny amounts by an organism, as well as phytochemicals. For example, iron, manganese, boron, zinc, copper, molybdenum, chlorine.
Which of the following nutrients affects the physiological process in the plants?
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Carbon
0%
Sulphur
0%
Iron
0%
All of the above
Explanation
Essential mineral nutrients are element that are absolutely necessary for supporting normal growth and reproduction. In the absence of the element the plants do not complete their life cycle or set the seeds.
These element must be directly involved in the metabolism of the plant.
These elements are further divided into two broad categories based on their quantitative requirements: Macronutrients and micronutrients.
Macronutrients are generally present in plant tissues in large amounts. Carbon is one of the primary macronutrient that affects the physiological process in the plants.
While iron and sulphur are micronutrients but also affects the physiological process in the plants.
So, the correct answer is option D.
An element is called micro-essential when it:
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Is less important than the major essential elements
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Is more important that the major essential elements
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Is present in very small quantities in the soil
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Is needed in very small quantity but is as important as major essential elements
Explanation
The elements which are required to the plants in very small quantity but is important as major essential elements are known as micro-essential elements.
Some examples are nitrogen, boron, manganese, zinc, copper etc.
So, the correct option is 'Is needed in very small quantity but is an important as major essential elements'.
The element which is required in largest quantities by plant is
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Phosphorous
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Nitrogen
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Calcium
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Sulphur
Hoagland solution is used in which of the following methods?
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Hydroponic method
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Aeroponic method
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Fogponic method
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None of the above
Explanation
The Hoagland solution is a nutrient solution used in hydroponics.
Here the plants are submerged in a thin layer of solution.
In
aeroponics
, the nutrient solution is sprayed as fog or mist.
Fogponics is a type of aeroponics in which electric fogger is used.
So the correct answer is 'Hydroponic solutions.
Essential elements which are required in plants in traces only, equal or less than 0.1 mg/gm of dry matter is known as
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0%
Micronutrients
0%
Macronutrients
0%
Minerals
0%
Non-mineral elements
Explanation
Essential elements which are required in plants in traces only, equal or less than 0.1 mg/gm of dry matter are known as micronutrients.
There are about seven nutrients essential to plant growth and health that are only needed in very small quantities. They are
boron (B), zinc (Zn), manganese (Mn), iron (Fe), copper (Cu), molybdenum (Mo), chlorine (Cl). They constitute in total less than 1% of the dry weight of most
plants.
Therefore, the correct answer is option A.
What word describes the relationship between the plant and the nitrogen fixing bacteria?
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Parasitic
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Carnivorous
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Infection
0%
Mutualistic, saprophytes
Explanation
The symbiotic nitrogen fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
An organism which lives in or on another organism (its host) and benefits by deriving nutrients at the other's expense is known as parasitic organism like the nitrogen fixing bacteria in the host plant say legumes.
Essential elements which are present in easily detectable quantities, at least 1 milligram (1000 microgram) per gram of dry matter is
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Micronutrients
0%
Macronutrients
0%
Essential nutrient
0%
Non essential nutrient
Explanation
Macro-nutrients are the type of nutrients that are required in a large amount to the plants for their better growth and thus are present in easily detectable quantities, at least 1 milligram (1000 microgram) per gram of dry matter.
Some examples of these nutrients are nitrogen, carbon, oxygen, sulphur, potassium, etc.
So, the correct option is 'Macro-nutrients'.
How is Rhizobium useful to farmers?
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They help in nitrogen fixation in the soil.
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They help in killing pests.
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They make the soil airy, soft and fertile.
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They help in pulling out of weeds.
Explanation
Rhizobium
fixes nitrogen in symbiotic association with roots of leguminous plants. Initially, the bacteria grow in soil near the roots of higher plants where they fail to fix the nitrogen. These bacteria when coming in contact with leguminous plants, interact chemically and enter into roots through root hairs, and fix nitrogen by symbiotic association.
Thus, the correct answer is option A.
Find the odd one out:
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Nitrogen
0%
Potassium
0%
Zinc
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Phosphorus
Explanation
Correct Answer:
C
Explanation:
•
Nitrogen
is necessary for plant growth since it is involved in
energy metabolism and protein synthesis.
•
Phosphorus
plays a role in
root growth
by stimulating it. It encourages flowering in the aerial zone.
•
Potassium
is involved in
water control
and the transport of reserve chemicals in plants. It boosts photosynthesis, strengthens cell tissue, and initiates the nitrate absorption process.
•
Zinc
is utilised to
make chlorophyll
and certain carbohydrates, as well as the conversion of starches to sugars.
•
It also contributes to the
formation of auxins
required for growth.
•
Nitrogen, potassium, and phosphorus are
macronutrients
that are necessary for plant growth and development.
•
NPK fertilisers contain them.
•
Plants require zinc as a
micronutrient.
Hence,
zinc
is the odd one out.
Which of the following is not included in micronutrients?
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Zn and Mn
0%
B and Cu
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Cl and Ni
0%
K and S
Explanation
Essential elements which are required in plants in traces only, equal or less than 0.1 mg/gm of dry matter are known as micronutrients.
There are about seven nutrients essential to plant growth and health that are only needed in very small quantities. They are
boron (B), zinc (Zn), manganese (Mn), iron (Fe), copper (Cu), molybdenum (Mo), chlorine (Cl). They constitute in total less than 1% of the dry weight of most
plants
.
Therefore, the correct answer is option D.
The disadvantage of hydroponic method is that it is
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Requires large quantity of water.
0%
Time consuming.
0%
Expensive.
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Harmful to plants.
Explanation
Hydroponics requires less water than irrigation on agricultural lands.
It is a quicker and a safer as well as productive method.
The disadvantage is that it is an expensive project which requires proper conditions and large investment.
So the correct answer 'Expensive'.
Which one of the following is not an essential element for plants?
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Iron
0%
Zinc
0%
Potassium
0%
Iodine
Explanation
Iodine is not an essential element for the plant. No major functions will be harmed in case of deficiency. Hence it is a micronutrient.
Whereas iron, zinc and potassium are macronutrients. They are essential for structural, functional and metabolic processes.
So, the correct answer is 'Iodine'.
Hydroponic requires
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1/10 of water.
0%
1/35 of water.
0%
1/55 of water.
0%
1/5 of water.
Explanation
Hydroponics requires 10 times less water than normal agricultural plants that require proper methods of watering. A lot of water gets evaporated from the soil or seeps deep inside the layers. But in hydroponics water requirement is just 1/10 of water requirements of traditional agriculture.
So the correct answer is ' 1/10 of water'.
Which of the following is used in hydroponics?
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Sand peat
0%
Gravels
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Crushed quartz
0%
Both A and B
Explanation
Growing medium is an important component of hydroponics.
Some most common growing mediums are :
1. Sand peat
2. Rockwool
3. Gravels
4. Perlite
So the correct answer is 'Both A and B'.
The function of leghemoglobin in the root nodules of legumes is
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Oxygen removal
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Inhibition of nitrogenase activity
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Expression of nif gene
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Nodule differentiation
Explanation
The function of Leghaemoglobin is to aid nitrogen fixation. Hence it cannot inhibit nitrogenase activity.
The expression of nif gene is controlled by NifA protein.
Differentiation of nodules is caused by the symbiotic relationship of the plant with Nitrogen-fixing bacteria.
The main function of leghemoglobin can hence be considered as creating an oxygen-free environment by removing oxygen so that Nitrogen fixation can occur.
So the correct answer is 'Oxygen removal'.
In plants, minerals
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Help establish gradients across membranes
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Influence water movement into cells
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Maintain cell shape and growth
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All of the above
Explanation
Minerals are very important for plants because:
1. They help in maintaining gradients across membrane's like potassium, Sodium, etc.
2. They influence water movement into the cell. For example Opening of stomata is caused by movement of water into guard cells due to influx of potassium.
3. Cell shape and growth is maintained. Example Calcium, etc
So the correct answer is 'All of the above'.
Hydroponic is a subset of what type of culture?
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Hydroculture
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Solid medium culture
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Xeroculture
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Tissue culture
Explanation
Hydroponics is a sub set of hydroculture. In this method plants are grown without soil by using nutrient solutions.
Tissue culture is the method of growing plants from cells or tissues, derived from an organism, in an artificial medium.
Solid medium culture involves the growth of plants or microbes on a solid support which contains the nutrients such as agar gel, etc.
So the correct answer is 'Hydroculture'.
Hydroponic is a technique of growing
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Submerged plants
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Free floating aquatic plants
0%
Terrestrial plants in sand
0%
Terrestrial plants in water containing nutrients
Explanation
Hydroponics is a technique of growing terrestrial plants.
It uses a nutrient solution called Hoagland solution.
A growing medium is used along with a thin layer of nutrient solution.
So the correct answer is 'Terrestrial plants in water containing nutrients'.
Which one of the following elements in plants is not remobilized?
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Calcium
0%
Phosphorus
0%
Sulphur
0%
Potassium
Explanation
Calcium is the element in plants which is not mobilised.
This is because it is a structural component and hence needs to be localised.
Phosphorus, Sulphur and Potassium are not structural elements and hence can be remobilised based on their need.
So the correct answer is 'Calcium'.
Which of the following is a bacterium involved in denitrification?
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Azotobacter
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Nitrosomonas
0%
Pseudomonas
0%
Nitrobacter
Explanation
Pseudomonas
is a denitrifying bacteria which breaks down nitrates into nitrogen.
Azotobacter
is a nitrogen fixing bacteria.
Nitrosomonas
converts ammonia into nitrites.
Nitrobacter
converts nitrites into nitrates.
So, the correct answer is '
Pseudomonas'.
The term hydroponic was coined by
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Sachs
0%
Gericke
0%
Pristely
0%
None of the above
Explanation
The term hydroponics was coined by William Frederick Gericke.
Priestly is famous for discovering gases.
Sachs discovered the Tay Sachs disease.
So the correct answer is 'Gericke'.
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