MCQ Questions for Class 11 Medical Biology Mineral Nutrition Quiz 8

Which one is a nitrogen fixer blue green algae?

0%
Ulothrix
0%
Anabaena
0%
Ulva
0%
Hydrodictyon

Macronutrients are elements that

0%
Play major role in plant nutrition
0%
Are required in large quantities in plants
0%
Form large molecules in plants
0%
None of the above

First experiments in hydroponics were performed by.

0%
Sachs
0%
Knop
0%
Hoagland
0%
Hill

Mineral requirement is studied through hydroponics which is related to growing plants in

0%
Soil
0%
Air
0%
Solution
0%
Ponds

Gene responsible for nitrogen fixation is

0%
Nif
0%
Nitrogenase
0%
Yeast alanine tRNA synthetase
0%
RNA synthetase

Yield of rice is enhanced by

0%
Azolla
0%
Anabaena
0%
Nostoc
0%
Clostridium

Which one is not a microelement for plants?

0%
Cu
0%
Zn
0%
Cr
0%
B

Nitrogen fixing symbiotic bacteria present in a legume root is

0%
Azotobacter
0%
Rhizobium
0%
Nitrobacter
0%
Nitrosomonas

Bacteria that convert ammonia to nitrite belong to

0%
Nitrobacter
0%
Nitrosomonas
0%
Pseudomonas
0%
Mycobacterium

Nitrifying bacteria convert

0%
Nitrate to nitrogen
0%
Ammonia to nitrogen
0%
Nitrogen into soluble form
0%
Ammonia to nitrate

Non-mineral essential elements are:

0%
Carbon, Hydrogen and Oxygen
0%
Hydrogen, Nitrogen and Sulphur
0%
Hydrogen, Nitrogen and Fluorine
0%
Chlorine, Fluorine and Nitrogen

Azolla has a symbiotic relationship with

0%
Chlorella
0%
Anabaena
0%
Nostoc
0%
Tolypothrix

An anaerobic bacterium capable of nitrogen fixation is

0%
Chlorobium
0%
Rhodospirillum
0%
Clostridium
0%
All of the above

Explanation

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.

Enzyme nitrogenase is required for.

0%
Nitrification
0%
Nitrite reduction
0%
Nitrate reduction
0%
Nitrogen fixation

Free living bacteria that can fix N

$_2$ in soil are

0%
Azotobacter
0%
Beijerinckia
0%
Clostridium
0%
All the above

Match the columns and select the correct option.

	Column I		Column II
a	Calcium	$1$ .	Chlorotic yerns
b	potassium	$2$ .	Delayed germmation of seeds
c	Zinc	$3$ .	Nicrosis of young leaves
d	Iron	$4$ .	Scorched leaf tip
e	Phosphorus	$5$ .	Malformed leaves

0%
$a3, b-1, c-5, d-2, e-4$
0%
$a-1, b-4, c-5, d-3, e-2$
0%
$a-2, b-3, c-4, d-1, e-5$
0%
$a-3, b-4, c-5, d-1, e-2$
0%
$a-4, b-2, c-1, d-3, e-5$

Nitrogen fixation of Rhizobium occurs inside

0%
Soil
0%
Rhizosphere association
0%
Foliar association
0%
Nodulated roots

Which is incorrect about ion channels?

0%
They are proteins
0%
All ions pass through same channel
0%
Movement through them is simple diffusion
0%
Movement through them is from high to low concentration

Free living nitrogen fixing aerobic bacterium is

0%
Rhodospirillum
0%
Anabaena
0%
Nostoc
0%
Beijerinckia
0%
Rhizobium

Zn, Cu, Fe and Mo are examples of

0%
Macronutrients
0%
Non-essential elements
0%
Trace elements
0%
None of the above

Explanation

The nutrients that are required in greater quantities are called macronutrients and those elements that are required in smaller quantities are called trace elements or micronutrients.

Macronutrients:

$N, K, Ca, Mg, P,$ and

$S$

Micronutrients:

$Cl, Fe, B, Mn, Zn, Cu, Mo,$ and

$Ni$

Micronutrients, since they are required in very little quantity are then often called 'Trace elements'.

Thus, the correct answer is option (C).

Which is not a free living nitrogen fixing bacterium?

0%
Azotobacter
0%
Rhizobium
0%
Bacillus
0%
Rhodospirillum

Where do bacteroids occur?

0%
Leaves
0%
Root nodules
0%
Stem
0%
Flower

The process of conversion of nitrogen to ammonia by microbes is?

0%
Nitrification
0%
Denitrification
0%
Nitrogen fixation
0%
Haber's process

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

0%
p-iv, q-iii, r-i, s-ii
0%
p-iii, q-v, r-i, s-ii
0%
p-iv, q-ii, r-i, s-iii
0%
p-ii, q-i, r-iii, s-iv

Match the columns and choose the correct combination.

	I(Essential Elements)		II(Deficiency Causes)
(a)	N, K, Mg, S, Fe, Mn, Zn and Mo	(i)	Inhibit cell division
(b)	N, K, S and Mo	(ii)	Necrosis
(c)	Ca, Mg, Cu and K	(iii)	Delay in flowering
(d)	N, S and Mo	(iv)	Chlorosis

0%
a - iv, b - iii, c - ii, d - i
0%
a - i, b - ii, c - iii, d - iv
0%
a - iv, b - i, c - ii, d - iii
0%
a - ii, b - iii, c - iv, d - i
0%
a - ii, b - iv, c - ii, d - i

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

$N_2$ .

0%
$8$
0%
$16$
0%
$5$
0%
$10$

Explanation

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.

Which of the following bacterium causes denitrification?

0%
Azotobacter
0%
Nitrobacter
0%
Nitrosomonas
0%
Pseudomonas

Explanation

Some of the nitrates present in the soil is reduced to gaseous nitrogen by the action of microorganisms. This process is called denitrification.

Denitrification is caused by bacteria Pseudomonas denitrificans and Thiobacillus denitrificans.

$2NO_3^- \rightarrow 2NO_2^- \rightarrow 2NO \rightarrow N_2O \rightarrow N_2$

The released N_2 escapes into the atmosphere.

Criteria of essentiality of nutrients in plants were given by ______.

0%
Stahl $(1923)$
0%
Benedict $(1927)$
0%
Arnon $(1938)$
0%
Sachs $(1860)$

For proper growth of a plant, the elements required in minute quantity as compared to other elements are known as

0%
Micronutrients
0%
Essential elements
0%
Necessary elements
0%
Both A and B

Which of the following is not a role played by Potassium in plant growth?

0%
Translocation of carbohydrates
0%
Maintaining anion-cation balance
0%
Opening and closing of stomata
0%
Synthesis of proteins
0%
Maintaining turgidity of cells

CBSE Questions for Class 11 Medical Biology Mineral Nutrition Quiz 8 - MCQExams.com

0:0:1

Practice Class 11 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 11 Medical Biology Mineral Nutrition Quiz 8 - MCQExams.com

0:0:1

Practice Class 11 Medical Biology Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.