Mineral Nutrition Test

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Mineral Nutrition Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

Nitrogen fixation of Rhizobium occurs inside

A
Soil

B
Rhizosphere association

C
Foliar association

D
Nodulated roots

Solution

Rhizobium is rod-shaped nitrogen-fixing bacteria that live symbiotically within the roots of several leguminous plants such as sweet pea. These bacteria produce small outgrowths (spherical) on the surface of legume roots called nodules and form nodulated roots
So the correct answer is 'Nodulated roots'.
Question 2
1 / -0

Which is incorrect about ion channels?

A
They are proteins

B
All ions pass through same channel

C
Movement through them is simple diffusion

D
Movement through them is from high to low concentration
Question 3
1 / -0

An anaerobic bacterium capable of nitrogen fixation is

A
Chlorobium

B
Rhodospirillum

C
Clostridium

D
All of the above

Solution

Reduction of inert atmospheric nitrogen to ammonia by living organisms is called biological nitrogen-fixation. Only certain prokaryotic organisms (some bacteria and cyanobacteria) are capable of fixing $$N_2$$. Such microbes are called $$N_2$$-fixers. These $$N_2$$-fixing microbes contain an exclusive enzyme, Nitrogenase that is capable of reducing nitrogen. The nitrogen-fixing microbes could be free-living or symbiotic in nature. Chlorobium, Rhodospirillum and Clostridium are anaerobic, free-living, $$N_2$$-fixing bacteria.
Question 4
1 / -0

Which is not a free living nitrogen fixing bacterium?

A
Azotobacter

B
Rhizobium

C
Bacillus

D
Rhodospirillum

Solution

Nitrogen-fixing bacteria are microorganisms that are capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds which can be used by the plants).
Two kinds of nitrogen-fixing bacteria are recognized.
1. Free-living (non-symbiotic) bacteria: cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.
2. Mutualistic (symbiotic) bacteria: Rhizobium, associated with leguminous plants; Frankia, associated with certain dicotyledonous species; and certain Azospirillum species, associated with cereal grasses.
Thus, the correct answer is option (B).
Question 5
1 / -0

Where do bacteroids occur?

A
Leaves

B
Root nodules

C
Stem

D
Flower

Solution

Bacteroids are nitrogen-fixing anaerobic bacteria present in the root nodules. They help in reduction of atmospheric nitrogen to ammonia. These bacteria live symbiotically in within the roots of leguminous plants and produce small outgrowths on the surface of legume roots called nodules.
So the correct answer is 'Root nodules'.
Question 6
1 / -0

In reductive amination, the product is?

A
$$\alpha$$-ketoglutaric acid

B
Glutamine

C
Glumate

D
Lactate

Solution

The correct option is B.
Reductive amination is a type of amination reaction in which conversion of the carbonyl group to amine takes place via imine intermediate formation. So clearly out of the four compounds given only Glutamine is having amine group as its functional group others are not having amine group. So clearly, only glutamine can only be the product of reductive amination out of four.
So the correct answer is Glutamine.
Question 7
1 / -0

Find out correctly matched pair between Nutrient and Functions.

A
Zinc - Helps to maintain ribosome structure

B
Magnesium - Needed during formation of mitotic spindle

C
Calcium - Plays a role in opening and closing of stomata

D
Manganese - Needed in the splitting of water to liberate oxygen during photosynthesis

E
Potassium - Needed in synthesis of auxin

Solution

Magnesium is a constituent of the ring structure of chlorophyll and helps to maintain the ribosome structure.
Calcium is needed during the formation of mitotic spindle.
Potassium plays an important role in the opening and closing of stomata.
Zinc is needed in the synthesis of auxin.
The manganese is needed in the splitting of water to liberate oxygen during photosynthesis.
Thus, the correct answer is option (D).
Question 8
1 / -0

Match the columns and choose the correct answer.
I II
(p) Thiobacillus (i) Nitrogen fixation
(q) Nitrosomonas (ii) Ammonification
(r) Azotobacter (iii) Nitrification
(s) Clostridium (iv) Denitrification

A
p-iv, q-iii, r-i, s-ii

B
p-iii, q-v, r-i, s-ii

C
p-iv, q-ii, r-i, s-iii

D
p-ii, q-i, r-iii, s-iv

Solution

a) Thiobacillus - This bacteria helps in the denitrification process.
b) Nitrosomonas - This is a nitrifying bacteria that convert ammonia into nitrite.
c) Azotobacter - It is a free nitrogen-fixing bacteria that help in nitrogen fixation.
d) Clostridium - It is a decay-causing bacteria that help in ammonification, i.e. organic nitrogen is converted into inorganic ammonia or ammonium ions.
So the correct answer is 'p-iv, q-iii, r-i, s-ii'.
Question 9
1 / -0

During symbiotic nitrogen fixation, how many ATPs are used in fixing one mole of $$N_2$$.

A
$$8$$

B
$$16$$

C
$$5$$

D
$$10$$

Solution

Some of the plants, especially the roots of legumes live in symbiotic association with $$N_2$$-fixing bacteria. They can fix nitrogen into biologically usable forms. This phenomenon is called symbiotic nitrogen fixation. The enzyme nitrogenase is required to fix atmospheric nitrogen. The molecule of nitrogen is reduced by the addition of hydrogen atoms provided by a reducing agent like $$NADPH_2$$. It produces dimide ($$N_2H_2$$), hydrazine ($$N_2H_4$$) and finally ammonia ($$NH_3$$) is formed.
The overall reaction involved in $$N_2$$-fixation is
$$N_2+8e^-+8H^++16ATP \rightarrow 2NH_3+H_2+16ADP+16P_i$$
Thus, one mole of nitrogen is converted into two molecules of ammonia. For producing 1 molecule of ammonia, 8 ATPs are needed. So, for fixing one mole of $$N_2$$, 16 ATPs are used.
Question 10
1 / -0

The metal ion is generally required for enzymes utilising ATP.

A
$$Cu^{2+}$$

B
$$K^{+}$$

C
$$Mg^{2+}$$

D
$$Na^+$$

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Re-Attempt Weekly Quiz Competition

	I		II
(p)	Thiobacillus	(i)	Nitrogen fixation
(q)	Nitrosomonas	(ii)	Ammonification
(r)	Azotobacter	(iii)	Nitrification
(s)	Clostridium	(iv)	Denitrification

Mineral Nutrition Test - 55

Result

Mineral Nutrition Test - 55

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Rank

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SHARING IS CARING

Question 1

Soil

Rhizosphere association

Foliar association

Nodulated roots

Solution

Question 2

They are proteins

All ions pass through same channel

Movement through them is simple diffusion

Movement through them is from high to low concentration

Question 3

Chlorobium

Rhodospirillum

Clostridium

All of the above

Solution

Question 4

Azotobacter

Rhizobium

Bacillus

Rhodospirillum

Solution

Question 5

Leaves

Root nodules

Stem

Flower

Solution

Question 6

$$\alpha$$-ketoglutaric acid

Glutamine

Glumate

Lactate

Solution

Question 7

Zinc - Helps to maintain ribosome structure

Magnesium - Needed during formation of mitotic spindle

Calcium - Plays a role in opening and closing of stomata

Manganese - Needed in the splitting of water to liberate oxygen during photosynthesis

Potassium - Needed in synthesis of auxin

Solution

Question 8

p-iv, q-iii, r-i, s-ii

p-iii, q-v, r-i, s-ii

p-iv, q-ii, r-i, s-iii

p-ii, q-i, r-iii, s-iv

Solution

Question 9

$$8$$

$$16$$

$$5$$

$$10$$

Solution

Question 10

$$Cu^{2+}$$

$$K^{+}$$

$$Mg^{2+}$$

$$Na^+$$

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