Tag: photosynthetic pigments

Questions Related to photosynthetic pigments

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

botany photosynthesis types of chlorophyll pigments photosynthetic pigments

  1. Rosa, Prunus

  2. Crinum, Raphanus

  3. Arachis, Cicer

  4. Linum, Olea

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Correct Option: A

Which of these is a type of phycobilin pigments?

botany photosynthesis types of chlorophyll pigments photosynthetic pigments

  1. Phycocyanin

  2. Allophycocyanin

  3. Phycoerythrin

  4. All of the above

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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.

botany photosynthesis types of chlorophyll pigments photosynthetic pigments

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

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

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

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

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Correct Option: A

Energy transfer in photosynthesis occurs as

botany photosynthesis types of chlorophyll pigments photosynthetic pigments

  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

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Correct Option: C

Major Pigments in Phaeophycae :

botany photosynthesis types of chlorophyll pigments photosynthetic pigments

  1. Chlorophyll $a$

  2. Chlorophyll $c$

  3. Fucoxanthin

  4. All the above

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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.

biology photosynthesis in higher plants types of chlorophyll pigments photosynthetic pigments

  1. (i) and (iii)

  2. (iii) and (iv)

  3. (ii) only

  4. (iv) only

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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'.

Which of the following processes forms chemical potential energy from electromagnetic energy?

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Respiration

  2. Photosynthesis

  3. Decomposition

  4. Nitrogen fixation

  5. Fermentation

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Correct Option: B
Explanation:

Electromagnetic energy is the same as radiation or light energy. This type of kinetic energy can take the form of visible light waves, like the light from a candle or a light bulb, or invisible waves, like radio waves, microwaves, x-rays and gamma rays. Further, irrespective of where radiation is coming from, it can travel in a vacuum. The electromagnetic energy in plants can be converted to stored chemical energy during photosynthesis. 

Which of the following is responsible for the red, orange and yellow colour of leaves?

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Carotenoids

  2. ATP

  3. Leaf decay

  4. Chlorophyll

  5. Over abundance of water

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Correct Option: A
Explanation:

Option 'A' is correct.

Carotenoids are responsible for the red, orange and yellow color of leaves. Carotenoids are present with chlorophyll, but in summer the leaves are green because of high levels of chlorophyll. Summer masks the color of carotenoids, During autumn, the color of carotenoids becomes more noticeable because of the degradation of chlorophyll. As the autumn progresses, carotenoids also degrade along with chlorophyll but at a much slower rate. Hence the yellow, orange, red colors become visible.   

The factory for synthesis of sugars in autotrophic eukaryotes is

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Chloroplast

  2. Mitochondrion

  3. Endoplasmic reticulum

  4. Ribosome

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Correct Option: A
Explanation:

Chloroplasts are the cell organelles where photosynthesis occurs. The light reactions occur in thylakoid membranes and dark reactions occur in stroma of chloroplasts. These reactions result in synthesis of sugars (glucose) in chloroplasts.

The light is trapped by photosynthetic pigments presents in the 

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Stroma

  2. Grana

  3. Quantosomes

  4. Periplastidial space

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Correct Option: B
Explanation:

The chloroplast is the cell organelles present in plant cells that are responsible for initiating the process of photosynthesis. Chloroplasts are double-membrane bound structures. The stroma of chloroplast is the jelly-fluid like structure in which another membrane system is presently called the thylakoids. These thylakoids are stacked upon each other to form the structure called grana. The grana are connected with each other by an extension of thylakoids called stroma lamellae. Thylakoid of grana has the photosynthetic pigments embedded in it that perform the trapping of sunlight and begin the light reaction of the photosynthesis.

A. Stroma is the region where the dark reaction of the photosynthesis occurs.
B. Grana is the region where the light reaction occurs through the trap of light by the photosynthetic pigment.
C. Quantasomes are the photosynthetic units made of pigments and are present in the grana.
D. Periplastidial space is the region between the inner membrane and the outer membrane of the plastids.
Hence, the correct answer is 'Grana'