Tag: photosynthetic pigments

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Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments
Accessory photosynthetic pigments in most green plants are 
  1. Chlorophyll $a$
  2. Chlorophyll $b$

  3. Carotenoids and xanthophylls

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Chlorophyll a is found in almost all photosynthetic plants except bacteria it is called primary photosynthetic pigment because it performs primary reactions of photosynthesis which involve the conversion of light energy into chemical energy. other photosynthetic pigments like chlorophyll b, xanthophylls and carotenes are called accessory pigments. They absorb light energy of different wavelengths, broaden the spectrum of light absorption and hand over the energy to chlorophyll aq through electron spin resonance and also protect chlorophyll a from photo-oxidation.
So the correct option is 'both (b) and (c)'.
Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments

Which of the following are water soluble pigments? 
A. Chlorophyll A
B. Chlorophyll B
C. Carotenids
D. Phycobilins 

  1. A and B (2)

  2. C and D

  3. Only D

  4. Only C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorophylls and carotenoids are lipid-soluble pigments located within the thylakoid membranes. Phycobilins, found in red algae and cyanobacteria, are water-soluble accessory pigments.

Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments

The photosynthetic pigment found in red algae is 

  1. Phycocyanin

  2. Carotene

  3. Phycoerythrin

  4. both (a) and (b)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red algae (Rhodophyta) derive their characteristic red color and light-harvesting capability primarily from the water-soluble accessory pigment phycoerythrin.

Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments

The empirical formula for chlorophyll 'a' is ___________________.

  1. $C _{35}H _{72}O _{5}N _{4}Mg$
  2. $C _{35}H _{70}O _{6}N _{4}Mg$
  3. $C _{55}H _{72}O _{5}N _{4}Mg$
  4. $C _{54}H _{70}O _{6}N _{4}Mg$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorophyll a is bluish-green with empirical formula of C55H72O5N4Mg

So the correct option is C.

Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments

Reserve food material in plants is in form is _______.

  1. Cellulose

  2. Starch

  3. Pectin

  4. Sucrose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants is the kingdom of organisms that possess chlorophyll. They synthesis their food by the process called photosynthesis. Starch is synthesized during the process of photosynthesis and stored as reserved food material.

Multiple choice botany photosynthesis types of chlorophyll pigments photosynthetic pigments

Bacteriochlorophyll differs from chlorophyll 'a' in having

  1. One pyrole ring with one hydrogen

  2. One pyrole ring with two hydrogen

  3. One pyrole ring with three hydrogen

  4. One pyrole ring with four hydrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Purple sulphur bacteria and non-sulphur bacteria contain bacteria-chlorophyll,which is having 2H-atoms more than chl.a and it absorb 850-950 nm(infra-red) wavelength of light.