Nitrogen Fixation and Photosynthesis Questions and Answers

Multiple Choice Questions and Answers on Nitrogen Fixation and Photosynthesis

Question 1 : Which of the following aid plants in the acquisition of nitrogen from nitrogen gas of the atmosphere?

  1. Bacteria
  2. Algae
  3. Nematodes
  4. Moulds

Answer : 1

Question 2 : A major plant macronutrient found in nucleic acids and proteins is

  1. calcium
  2. nitrogen
  3. sulphur
  4. iron

Answer : 2

Question 3 : What is the metal ligand in chlorophylls?

  1. Copper (Cu)
  2. Iron (Fe)
  3. Magnesium (Mg)
  4. Manganese (Mn)

Answer : 3

Question 4 : Nitrosomonous and Nitrobacter obtain their carbon for growth from

  1. organic compounds
  2. carbon dioxide
  3. elementary carbon
  4. none of these

Answer : 2

Question 5 : Chlorophyll is associated with

  1. thylakoids
  2. stroma
  3. cristae
  4. matrix

Answer : 1

Question 6 : Organisms capable of converting N2 to NO3 are

  1. yeasts
  2. bacteria
  3. roundworms
  4. moulds

Answer : 2

Question 7 : Which of the following molecule is produced from the fixation of CO2 in C4 plants?

  1. Malate
  2. Oxaloacetate
  3. Pyruvate
  4. Alpha-ketoglutarate

Answer : 2

Question 8 : Plants absorb nitrates from soil and convert them into

  1. urea
  2. ammonia
  3. nitrogen
  4. none of these

Answer : 2

Question 9 : In the presence of carbon monoxide, nitrogen fixation

  1. increases
  2. decreases
  3. inhibits
  4. none of these

Answer : 3

Question 10 : An organism that relies exclusively on pre-synthesized food molecules is

  1. autotrophic
  2. photosynthetic
  3. prokaryotic
  4. heterotrophic

Answer : 4

Question 11 : In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?

  1. Erythrose-4-phosphate
  2. Ribulose-l,5-diphosphate
  3. Ribose-5-phosphate
  4. Alpha-ketoglutarate

Answer : 2

Question 12 : Which of the following bacteria genus is capable of oxidizing ammonia (NH4)?

  1. Nitrospina
  2. Nitrobacter
  3. Nitrosococcus
  4. Nitrosobacter

Answer : 3

Question 13 : 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

  1. harvesting unit
  2. reaction center
  3. photosynthetic unit
  4. chloromass

Answer : 3

Question 14 : The chief source of nitrogen for green plants is

  1. atmospheric nitrogen
  2. nitrates
  3. ammonium salts
  4. low molecular weight- organic nitrogenous compound

Answer : 2

Question 15 : What type of long chain alcohol is esterified to plant chlorophyll molecules?

  1. Dolichol
  2. Farnesol
  3. Phytol
  4. None of these

Answer : 3

Question 16 : During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately

  1. 12 ATP
  2. 18 ATP
  3. 25 ATP
  4. 7 ATP

Answer : 2