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Doctors Medicines MCQs Q&A

  1. Sucrose reacts with oxygen in presence of sunlight and chlorophyll to form and carbon dioxide.
  2. Carbon dioxide reacts with water in presence of sunlight and chlorophyll to form sucrose. 
  3. Glucose reacts with oxygen in presence of sunlight and chlorophyll to form water and carbon dioxide. 
  4. Carbon dioxide reacts with water in presence of sunlight and chlorophyll to form glucose. 
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Option 4 : Carbon dioxide reacts with water in presence of sunlight and chlorophyll to form glucose. 

The correct answer is Carbon dioxide reacts with water in presence of sunlight and chlorophyll to form glucose.

Concept:

Photosynthesis:

  • Photo means light and synthesis means building up. 
  • It occurs in green plants, photosynthetic bacteria, and some protists. 
  • It is a process in which carbon dioxide and water are converted into glucose in the presence of sunlight and chlorophyll.
  • Oxygen is the by-product. 

Explanation:

  • The steps involved in photosynthesis:-
    • Absorption of light energy by leaves through the chlorophyll
    • Conversion of light energy into chemical energy and splitting of water into hydrogen and oxygen
    • Reduction of carbon dioxide into carbohydrates
  • The following chemical reaction takes place during photosynthesis:
    • 6CO2    +   6H2O  —>  C6H12O6  + 6O2

​So, Carbon dioxide reacts with water in presence of sunlight and chlorophyll to form glucose.

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