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Light Reaction - Basic

Dear Readers,

The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.

Q1. The synthesis of ATP in photosynthesis and respiration is essentially an oxidation-reduction process involving removal of energy from

  •  Oxygen
  •  Phytochrome
  •  Cytochrome
  •  Electrons

Electrons

Q2.  Assertion : Cyclic pathway of photosynthesis first appeared in some eubacterial species
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved

  •  If both Assertion and Reason are true and the reason is the correct explanation of the assertion
  •   If both Assertion and Reason are true but the reason is not the correct explanation of the assertion
  •  If Assertion is true statement but Reason is false
  •  If both Assertion and Reason are false

If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

Q3.  If the photosynthetic yield in blue wavelength is 10 units and that in red wavelength is 40 units; what should be the yield of photosynthesis in combination of two wavelengths, if the effect is synergistic

  •   30 units
  •   40 units
  •   50 units
  •  > 50 units

> 50 units

Q4. Which photochemical reaction generates strong oxidant and weak reductant

  •   LR - I
  •   LR - II
  •  Cyclic photophosphorylation
  •   Non-cyclic photophosphorylation

LR - II

Q5.  What is the common value of PQ (photosynthetic quotient) of a leaf

  •  >1
  •  <1
  •  One
  •  Zero

One

Q6.  Which one of the following is due energy currency of the cell or The common immediate source of energy in cellular activity is

  •  Phosphate
  •   ATP
  •   ADP
  •  AMP

ATP

Q7. Englemann (1882) observed accumulation of aerobic bacteria around blue and red illumination of chloroplast in green alga Cladophora. He therefore concluded that

  •   Chlorophyll absorbs green light
  •   Absorption spectrum of O2 evolution is blue and red
  •  O2 is released from H2O in light reaction
  •  O2 is released from CO2 in light reaction

Absorption spectrum of O2 evolution is blue and red

Q8.  Continued evolution of O2 in suspension of an isolated chloroplast in light in the presence of ferric salt, viologen dyes etc. is called

  •  Emerson’s reaction
  •  Hill’s reaction
  •   Blackmann’s reaction
  •   Oxygentaion

Hill’s reaction

Q9. The rate of photosynthesis declines in the presence of red light and is increased to normal level when red light is supplemented with

  •  Far-red light
  •  Orange light
  •  Blue light
  •  Ultraviolet light

Blue light



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