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MCQs

Total Questions : 159 | Page 5 of 16 pages
Question 41. When guard cells swell
  1.    stomata close
  2.    stomata open
  3.    photosynthesis stops
  4.    evaporation stops
 Discuss Question
Answer: Option B. -> stomata open
Answer: (b).stomata open
Question 42. Normally CO2 and O2 enter a plant by
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    evaporation
 Discuss Question
Answer: Option C. -> diffusion
Answer: (c).diffusion
Question 43. Water moves into roots of plants by
  1.    osmosis
  2.    active transport
  3.    diffusion
  4.    pressure flow mechanism
 Discuss Question
Answer: Option A. -> osmosis
Answer: (a).osmosis
Question 44. In plant cells, which of the following is not a function of the large central vacuoles of plant cells?
  1.    Storage of food
  2.    Support
  3.    Contractile regulation of
  4.    Waste storage water content
 Discuss Question
Answer: Option C. -> Contractile regulation of
Answer: (c).Contractile regulation of
Question 45. Which of the following experimental results does not support Mitchell's chemiosmosis theory?
  1.    Electron transport in isolated mitochondria was shown to result in acidification of the medium
  2.    Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
  3.    Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
  4.    An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport
 Discuss Question
Answer: Option B. -> Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
Answer: (b).Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
Question 46. Both plant and animal cell possess
  1.    cell walls
  2.    mitochondria
  3.    central vacuoles
  4.    chloroplast
 Discuss Question
Answer: Option B. -> mitochondria
Answer: (b).mitochondria
Question 47. Which of the following can be found as a part of the mitochondrial matrix?
  1.    Ribosomes
  2.    DNA
  3.    Enzymes
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 48. Cellular metabolism is an example of
  1.    equilibrium metabolism
  2.    steady-state metabolism
  3.    a series of reactions occurring under standard conditions
  4.    a series of reactions that defy the second law of thermodynamics
 Discuss Question
Answer: Option B. -> steady-state metabolism
Answer: (b).steady-state metabolism
Question 49. Organogenesis is
  1.    formation of callus tissue
  2.    formation of root and shoots on callus tissue
  3.    both (a) and (b)
  4.    genesis of organs
 Discuss Question
Answer: Option B. -> formation of root and shoots on callus tissue
Answer: (b).formation of root and shoots on callus tissue
Question 50. Protoplasts are the cells devoid of
  1.    cell membrane
  2.    cell wall
  3.    both cell wall and cell membrane
  4.    none of these
 Discuss Question
Answer: Option B. -> cell wall
Answer: (b).cell wall

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