Nitrogen Fixation and Photosynthesis

Q1: Which of the following molecule is produced from the fixation of CO2 in C4 plants?

A Malate

B Oxaloacetate

C Pyruvate

D Alpha-ketoglutarate

ANS:B - Oxaloacetate

In c4 plants co2 is fixed with PEPA the three carbon compound and the stable four carbon compound formed namely oxaloacetic acid.

Q2: A major plant macronutrient found in nucleic acids and proteins is

A calcium

B nitrogen

C sulphur

D iron

ANS:B - nitrogen

Good question. Thanks.

Q3: Nitrosomonous and Nitrobacter obtain their carbon for growth from

A organic compounds

B carbon dioxide

C elementary carbon

D none of these

ANS:B - carbon dioxide

No answer description is available.

Q4: 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

ANS:B - Ribulose-l,5-diphosphate

No answer description is available.

Q5: Organisms capable of converting N2 to NO3 are

A yeasts

B bacteria

C roundworms

D moulds

ANS:B - bacteria

No answer description is available.

Q6: What is the metal ligand in chlorophylls?

A Copper (Cu)

B Iron (Fe)

C Magnesium (Mg)

D Manganese (Mn)

ANS:C - Magnesium (Mg)

No answer description is available.

Q7: What type of long chain alcohol is esterified to plant chlorophyll molecules?

A Dolichol

B Farnesol

C Phytol

D None of these

ANS:C - Phytol

No answer description is available.

Q8: 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

ANS:A - Bacteria

No answer description is available.

Q9: 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


ANS:B - 18 ATP

How it needs 18 molecules, one N2 needs 8 ATP molecule to breakdown then how come it needs 18 ATP?

Q10: Which of the following bacteria genus is capable of oxidizing ammonia (NH4)?

A Nitrospina

B Nitrobacter

C Nitrosococcus

D Nitrosobacter

ANS:C - Nitrosococcus

No answer description is available.

Q11: The chief source of nitrogen for green plants is

A atmospheric nitrogen

B nitrates

C ammonium salts

D low molecular weight- organic nitrogenous compound

ANS:B - nitrates

Ammonium salts is the correct answer.

Q12: An organism that relies exclusively on pre-synthesized food molecules is

A autotrophic

B photosynthetic

C prokaryotic

D heterotrophic

ANS:D - heterotrophic

No answer description is available.

Q13: In the presence of carbon monoxide, nitrogen fixation

A increases

B decreases

C inhibits

D none of these

ANS:C - inhibits

Sir, kindly request please explain its mechanism.

Q14: Chlorophyll is associated with

A thylakoids

B stroma

C cristae

D matrix

ANS:A - thylakoids

No answer description is available.

Q15: 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

ANS:C - photosynthetic unit

No answer description is available.

Q16: Plants absorb nitrates from soil and convert them into

A urea

B ammonia

C nitrogen

D none of these

ANS:B - ammonia

No answer description is available.

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