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  • Which of the following is correct w.r.t carotenoids? i) These are water soluble ii) These are soluble in organic solvents iii) Carotenes contain oxygen iv) X

Which of the following is correct w.r.t carotenoids?

i) These are water soluble

ii) These are soluble in organic solvents

iii) Carotenes contain oxygen

iv) Xanthophylls contain oxygen

Choose the correct option:

Option: 1

i, ii and iii


Option: 2

i and ii only


Option: 3

ii and iv only


Option: 4

All of these


Answers (1)

best_answer

Carotenoids:

  • Carotenoids are plant pigments responsible for bright red, yellow and orange hues.
  • These act as shield pigments to prevent the chlorophyll from photooxidation.
  • These help plants absorb light energy for use in photosynthesis. 
  • These are water-insoluble but soluble in organic solvents.
  • There are two types of carotenoids: Carotenes and Xanthophylls.
  • The difference between the two groups is chemical: xanthophylls (C_{40}H_{56}O_{2})contain oxygen, while carotenes (C_{40}H_{56}) are hydrocarbons and do not contain oxygen. 
  • Also, the two absorb different wavelengths of light during a plant’s photosynthesis process, so xanthophylls are more yellow while carotenes are orange. 
  • The common type of carotene is beta-carotene.
  • The common type of xanthophyll is lutein.
  • The ratio of xanthophyll to carotene in plants is 3:1 or 2:1.

-Carotenoids are water-insoluble but soluble in organic solvents. Xanthophylls (C_{40}H_{56}O_{2}) contain oxygen, while carotenes \left ( C_{40}H_{56} \right ) are hydrocarbons and do not contain oxygen. Hence, the correct answer is option c.

 

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rishi.raj

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