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Types of chlorophyll - class-XI

Description: types of chlorophyll
Number of Questions: 16
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Tags: chemistry biology botany biochemistry photosynthesis photosynthesis in higher plants
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Water soluble vitamins are

  1. C and D

  2. A and C

  3. B and C

  4. A and D


Correct Option: C

Carotenoids are _____________.

  1. Glycoproteins

  2. Hydrocarbons

  3. Polysaccharids

  4. Lipoproteins


Correct Option: A
Accessory photosynthetic pigments in most green plants are 
  1. Chlorophyll $a$

  2. Chlorophyll $b$

  3. Carotenoids and xanthophylls

  4. Both (b) and (c)


Correct Option: D
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)'.

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


Correct Option: A

The chlorophyll pigment found in green sulphur bacteria is

  1. Bacteriochlorophyll

  2. Bacterioviridin

  3. Phycocyanin

  4. Phycoerythrin


Correct Option: A

The photosynthetic pigment found in red algae is 

  1. Phycocyanin

  2. Carotene

  3. Phycoerythrin

  4. both (a) and (b)


Correct Option: A

How many chlorophyll molecules are found in a quantasome?

  1. $295$

  2. $500$

  3. $230$

  4. $100$


Correct Option: A

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. $C _{54}H _{70}O _{6}N _{4}Mg$


Correct Option: C
Explanation:

Chlorophyll a is bluish-green with empirical formula of C55H72O5N4Mg

So the correct option is C.

Reserve food material in plants is in form is _______.

  1. Cellulose

  2. Starch

  3. Pectin

  4. Sucrose


Correct Option: B
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.

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


Correct Option: B
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.

In which one of the following sets of plants is the endosperm chlorophyll us?

  1. Rosa, Prunus

  2. Crinum, Raphanus

  3. Arachis, Cicer

  4. Linum, Olea


Correct Option: A

Which of these is a type of phycobilin pigments?

  1. Phycocyanin

  2. Allophycocyanin

  3. Phycoerythrin

  4. All of the above


Correct Option: D
Explanation:

Phycobilins are open tetrapyrroles which neither contain magnesium nor phytol. Phycobilins are water soluble. The pigments are of two types-blue (phycocyanin, allophycocyanin) and red (phycoerythrin). The pigments are useful in chromatic adaptations. They are important accessory pigments of blue-green algae, cryptomonas and red algae. 

so the correct answer is 'All of the above'.

Consider the following pigments.
a. Chlorophyll a
b. Chlorophyll b
c. Chlorophyll c
d. Carotenes
e. Biliproteins
f. Xanthophylls
The characteristic photosynthetic pigments present in chlorophyceae would include.

  1. $1, 2, 3$ and $4$

  2. $1, 3, 4$ and $5$

  3. $2, 3, 5$ and $6$

  4. $1, 2, 4$ and $6$


Correct Option: A

Energy transfer in photosynthesis occurs as

  1. Phycoerythrin$\rightarrow $Phycocyanin$\rightarrow $Carotenoid$\rightarrow $Chlorophyll a

  2. Chlorophyll b$\rightarrow $Carotenoid$\rightarrow $Phycoerthrin$\rightarrow $Chlorophyll a

  3. Phycocyanin$\rightarrow $Phycoerythrin$\rightarrow $Cartenoid$\rightarrow $Chlorophyll a

  4. Chlorophyll$\rightarrow $Cartenoid$\rightarrow $Phycocyanin$\rightarrow $Chlorophyll a


Correct Option: C

Major Pigments in Phaeophycae :

  1. Chlorophyll $a$

  2. Chlorophyll $c$

  3. Fucoxanthin

  4. All the above


Correct Option: A

Which of the below statements is/are not correct regarding chlorophyll a molecule?

(i) Molecule formula of chl a is $C _{55}H _{72}O _5N _4Mg$
(ii) It is the primary photosynthetic pigment.
(iii) In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength. 
(iv)It is a soluble in water as well as petroleum ether.

  1. (i) and (iii)

  2. (iii) and (iv)

  3. (ii) only

  4. (iv) only


Correct Option: B
Explanation:

Chlorophyll a is the primary photosynthetic pigment, which is bluish green in the pure state. It has an empirical formula $C _{55}H _{72}O _5N _4Mg$and molecular weight of $893$. It absorbs more red wavelength of light than violet blue . It is soluble in a number of organic solvents such as petroleum ether. 

So, the correct answer is ' In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength and It is a soluble in water as well as petroleum ether'.

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