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Nitrogen Fixation and Photosynthesis MCQ Questions & Answers

Nitrogen Fixation and Photosynthesis MCQs : This section focuses on the "Nitrogen Fixation and Photosynthesis". These Multiple Choice Questions (MCQs) should be practiced to improve the Nitrogen Fixation and Photosynthesis skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

The chief source of nitrogen for green plants is

A. atmospheric nitrogen
B. nitrates
C. ammonium salts
D. low molecular weight- organic nitrogenous compound

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Question 2

A group of about 300 chlorophyll molecule acting together to trap photons and transfer energy to the pigment molecule at the reaction center may be called as

A. harvesting unit
B. reaction center
C. photosynthetic unit
D. chloromass

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Question 3

Which of the following aid plants in the acquisition of nitrogen from nitrogen gas of the atmosphere?

A. Bacteria
B. Algae
C. Nematodes
D. Moulds

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Question 4

What type of long chain alcohol is esterified to plant chlorophyll molecules?

A. Dolichol
B. Farnesol
C. Phytol
D. None of these

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Question 5

Chlorophyll is associated with

A. thylakoids
B. stroma
C. cristae
D. matrix

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Question 6

In the presence of carbon monoxide, nitrogen fixation

A. increases
B. decreases
C. inhibits
D. None of these

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Question 7

In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?

A. Erythrose-4-phosphate
B. Ribulose-l,5-diphosphate
C. Ribose-5-phosphate
D. Alpha-ketoglutarate

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Question 8

Which of the following molecule is produced from the fixation of CO2 in C4 plants?

A. Malate
B. Oxaloacetate
C. Pyruvate
D. Alpha-ketoglutarate

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Question 9

Plants absorb nitrates from soil and convert them into

A. urea
B. ammonia
C. nitrogen
D. None of these

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Question 10

What is the metal ligand in chlorophylls?

A. Copper (Cu)
B. Iron (Fe)
C. Magnesium (Mg)
D. Manganese (Mn)

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Question 11

Organisms capable of converting N2 to NO3 are

A. yeasts
B. bacteria
C. roundworms
D. moulds

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Question 12

Which of the following bacteria genus is capable of oxidizing ammonia (NH4)?

A. Nitrospina
B. Nitrobacter
C. Nitrosococcus
D. Nitrosobacter

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Question 13

A major plant macronutrient found in nucleic acids and proteins is

A. calcium
B. nitrogen
C. sulphur
D. iron

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Question 14

Nitrosomonous and Nitrobacter obtain their carbon for growth from

A. organic compounds
B. carbon dioxide
C. elementary carbon
D. None of these

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Question 15

During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately

A. 12 ATP
B. 18 ATP
C. 25 ATP
D. 7 ATP

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Question 16

An organism that relies exclusively on pre-synthesized food molecules is

A. autotrophic
B. photosynthetic
C. prokaryotic
D. heterotrophic

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