Mineral Nutrition Test

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Mineral Nutrition Test - 49

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Question 1
1 / -0

In Aulosira, Tolypothrix and Nostoc, ............ are the sites for nitrogen fixation.

A
Vesicles

B
Arbuscles

C
Akinetes

D
Heterocysts

Solution

Heterocyst is transparent thick walled empty cell which is present in intermittent position in filaments of blue green algae. They are the site of nitrogen fixation. Aulosira, Tolypothrix and Nostoc are the blue green algae wherein heterocyst serves as site for nitrogen fixation. Correct answer is D.
Question 2
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A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the aquatic fern Azolla is

A
Tolypothrix

B
Chlorella

C
Nostoc

D
Anabaena

Solution

Chlorella is a special type of micro algae that is known for its detoxifying & immune benefits. Nostoc is found in various environments that forms colonies composed of filaments of cells in a gelatinous sheath. Any sample of Azolla examined under a microscope will have filaments of Anabaena living within ovoid cavities inside the leaves which fixes nitrogen. It is a free living N$$_2$$ fixing cyanobacterium which forms symbiotic association with the aquatic fern Azolla.
So, the answer is D.
Question 3
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Hydroponics is

A
Soilless farming.

B
To grow plants in water.

C
To grow aquatic plants.

D
To grow floating hydrophytes.
Solution
Correct Answer: A
Explanation:
Hydroponics is the technique of culturing the plant in a solution of nutrients.
It is also known as soilless culture.
It helps in the growth of healthy plants without using traditional methods.
Question 4
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Identify the elements whose deficiency causes both necrosis and chlorosis.

A
Cu and Co

B
Mo and Ca

C
Mg and K

D
Fe and Mn

Solution

The plant requires the elements for the growth and developmental processes. The deficiency of the element causes adverse effects on the growth of the plant. The deficiency of the elements Mg and K results in the necrosis and chlorosis. Necrosis is the death of the living tissue and chlorosis is the decolourisation of the pigment of the leaves.
Thus, the correct answer is option C.
Question 5
1 / -0

Which one of the following statements about nitrogenase is correct ?

A
It is sensitive to $$CO_2$$ and therefore present is isolated nodules.

B
It requires $$O_2$$ and therefore functional during the day.

C
It is sensitive to $$O_2$$ and therefore is functional anaerobic environments.

D
It is sensitive to light and therefore functions only in dark.

Solution

Rhizobium fixes nitrogen with the help of nitrogenase enzyme that converts nitrogen to ammonium. Leghaemoglobin pigment present in the root nodules scavenges free oxygen so that nitrogenase can carry out its activity of nitrogen fixation unhindered. Enzyme nitrogenase is oxygen labile. Oxygen will make the enzyme irreversibly inactive. So, the nitrogen-fixing bacteria needs to protect the nitrogenase enzyme from oxygen. Thus, the correct answer is option C.
Question 6
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Root nodules are not formed in non-leguminous plants because they grow in

A
Nitrogen deficient soils

B
Soils having bacteria for converting nitrogen into usable form

C
Soils rich in nitrogen

D
All the above

Solution

Roots nodules are not formed in non-leguminous plants because they grow in soils having bacteria for converting nitrogen into a usable form. So, they do not need bacteria stored in the nodules to obtain nitrogen content like legumes.
So, the correct option is 'Soils having bacteria for converting nitrogen into a usable form'.
Question 7
1 / -0

Nitrogen fixation is performed by

A
Green algae and fungi

B
Ferns and cycads

C
Legumes and cereals

D
Blue-green algae and bacteria

Solution

The atmospheric nitrogen is not available to plants. There are some nitrogen-fixing bacteria which converts atmospheric nitrogen into ammonia which is readily available to plants. Azotobacter is a free-living nitrogen-fixing bacteria. Rhizobium in association with the leguminous plants carries out the process of nitrogen fixation. Blue-Green algae like Anabaena and Nostoc are free-living nitrogen-fixing bacteria. However, they are symbiotic bacteria as well.
Thus, the correct answer is Blue-green algae and bacteria.'
Question 8
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Most abundant mineral of cellular pool is

A
Calcium

B
Magnesium

C
Potassium

D
Chloride
Solution
- Potassium is an essential mineral needed to regulate water balance, levels of acidity, and blood pressure.
- It is important in controling the activity of heart, muscles and the nervous system.
- Pottasium works together with the sodium for the nervous system to transmit the messages as well as regulating the contraction of muscles.
- Around 98% of the potassium in our body can be found in our cells, hence potassium is the most abundant mineral of cellular pool.
so the correct answer is option C.
Question 9
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Which of the following minerals helps in $$N_2$$ fixation?

A
Copper

B
Zinc

C
Manganese

D
Molybdenum

Solution

Molybdenum is an important component of the nitrogen fixing enzymes known as nitrogenase. It is made up of two components, component I dinitrogenase and component II is dinitrogenase reductase. Component II is a Fe protein that contains the Fe-S cluster which transfers electrons to Component I and actively reduces it and participates in nitrogen fixation.
So, the correct answer is option D.
Question 10
1 / -0

Buds that produced lateral branches develop at

A
Internodes

B
Apical meristems

C
Auxillary meristems

D
Nodes

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Re-Attempt Weekly Quiz Competition

Mineral Nutrition Test - 49

Result

Mineral Nutrition Test - 49

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Rank

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SHARING IS CARING

Question 1

Vesicles

Arbuscles

Akinetes

Heterocysts

Solution

Question 2

Tolypothrix

Chlorella

Nostoc

Anabaena

Solution

Question 3

Soilless farming.

To grow plants in water.

To grow aquatic plants.

To grow floating hydrophytes.

Solution

Question 4

Cu and Co

Mo and Ca

Mg and K

Fe and Mn

Solution

Question 5

It is sensitive to $$CO_2$$ and therefore present is isolated nodules.

It requires $$O_2$$ and therefore functional during the day.

It is sensitive to $$O_2$$ and therefore is functional anaerobic environments.

It is sensitive to light and therefore functions only in dark.

Solution

Question 6

Nitrogen deficient soils

Soils having bacteria for converting nitrogen into usable form

Soils rich in nitrogen

All the above

Solution

Question 7

Green algae and fungi

Ferns and cycads

Legumes and cereals

Blue-green algae and bacteria

Solution

Question 8

Calcium

Magnesium

Potassium

Chloride

Solution

Question 9

Copper

Zinc

Manganese

Molybdenum

Solution

Question 10

Internodes

Apical meristems

Auxillary meristems

Nodes

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