Tag: photosynthetic pigments

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Questions Related to photosynthetic pigments

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Chloroplast stroma contains

  1. Chlorophyll

  2. Light dependent reaction enzymes

  3. Light independent reaction enzymes

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

In photosynthesis, light-independent reactions are known as dark reactions. This process does not depend directly on the presence of light but is dependent on the products of light reaction i.e., ATP and NADPH. The dark reactions occur through Calvin cycle. They take place in the stromal matrix of the chloroplast. Chloroplast stroma contains light independent reaction enzymes which are required for the reaction. Thus, the correct answer is option C.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Where does the primary photochemical reaction occurs in chloroplast ? Where does the light reaction of photosynthesis taken place?

  1. Stroma

  2. Endoplasmic reticulum

  3. Quantasome or thylakoids (Grana)

  4. Inner membrane of chloroplast
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the chloroplast, the primary photochemical reactions occur. During photosynthesis, primary reactions like the light-capturing and ATP-generating reactions occur on grana. Grana are stakes of thylakoids. Quantasomes are particles found in grana. During photosynthesis, the light-dependent reactions take place on the thylakoid membranes. The inside of the thylakoid membrane is called the lumen. Light-independent reactions take place in the stroma. 

Thus, the correct answer is 'Quantasome or thylakoids (Grana).'

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Which of the following absorb light energy for photosynthesis : -

  1. Chlorophyll

  2. Water molecule
  3. O$ _{2}$

  4. RUBP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A pigment is a compound that absorbs a particular wavelength of visible light. Chlorophyll is a green pigment contained in thylakoid membranes of chloroplasts that are used in photosynthesis by plants. The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.

So, the correct answer is 'Chlorophyll'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

In which of the following parts of the plant cell does photosynthesis occur?

  1. The chloroplasts

  2. The mitochondria

  3. The nucleus

  4. The endoplasmic reticulum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The green parts of the plants have the chlorophyll pigment containing chloroplasts. The chloroplast is a type of plastid which plays a major role in the photosynthesis process.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

From the following, an organelle containing chlorophyll is

  1. Chloroplast

  2. Endoplasmic reticulum

  3. Nucleus

  4. Mitochondria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. Chloroplasts are greenish plastids which possess photosynthetic pigments, chlorophylls and carotenoids and take part in the synthesis of food. Chlorophylls contain specialised light-absorbing green pigments, therefore help in photosynthesis.
B. Endoplasmic reticulum is a network of reticulum of tiny structures scattered in cytoplasm and composed of three structures- cisternae, tubules and vesicles.
C. Nucleus is a large organelle controlling all the activities of the eukaryotic cells and consists of nuclear envelope, nucleoplasm, nucleolus and chromatin.
D. Mitochondria are cylindrical double membrane organelles and composed of outer, inner membrane, crista and matrix.
So, the correct answer is 'Chloroplast'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Who gave chemical compositions of chlorophyll and carotenoids?

  1. Park and Biggins

  2. Meyer and French

  3. Willstatter and Stahl

  4. Arnon and Benson.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorophyll which is an essential factor in photosynthesis was first isolated and namedby Joseph Bienaime Caventou and Peter Joseph Pelletier but the chemical composition of the same was first elucidated by the German chemist Richard Willstatter followed by Hans Fischer.  Carotenoids which are the organic pigments found in the chloroplasts and chromoplasts of plants and other photosynthetic organisms. These  are oil-soluble molecules comprising of 40 branched carbon units bonded together.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Cytochrome is a :

  1. Mg containing pyrrole rings

  2. Fe containing porphyrin ring

  3. Nucleotide

  4. Alloy of inchrome.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(B) Fe containing Porphyrin ring 


Cytochromes are heme proteins that undergo oxidation Reduction reaction and differentiated on the Basis of 

their apoprotein structure, heme structures, and optical absorption in the visible spectrum.

As cytochromes are heme proteins which contain Iron compound in the Tetrapyrrole/Porphyrin structure.

Option B is correct.

Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

If 24 G-3-P molecule are formed in $C _3$ plants. Calculate 
a) the number of $CO _2$ used and 
b) the number of $G3P$ used for regeneration $RuBP$ molecule.

  1. a=12, b=20

  2. a=24, b=48

  3. a=12, b=24

  4. a=20, b=12
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
All together for one G3P to leave the cycle (and go towards glucose blend), three CO2 particles must enter the cycle, giving three new molecules of settled carbon. At the point when three CO2 particles enter the cycle, six G3P atoms are made. One leaves the cycle and is utilized to make glucose, while the other five must be reused to recover three atoms of the RuBP acceptor. 
3 CO2 joins with 3 RuBP acceptors, making 6 atoms of (G3P). 
1 G3P particle leaves the cycle and goes towards making glucose. 
5 G3P particles are reused, recovering 3 RuBP acceptor atoms.
So, the correct option is 'a=12, b=24'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

What percentage of water, proteins, lipids and pigments are present in chloroplasts respectively?

  1. 50, 25, 15 and 10

  2. 90, 5, 2 and 3

  3. 95, 2, 1 and 2

  4. 85, 10, 3 and 2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The chloroplasts are composed of the carbohydrates, lipids, proteins, chlorophyll, carotenoids (carotene and xanthophylls), DNA, RNA and certain enzymes and co-enzymes. The chloroplasts also contain some metallic atoms as Fe, Cu, Mn and Zn. By chemical analysis, these consist of lipids and proteins basically. Lipids are mainly phospholipid components of the membranes and lamellae. Proteins also contain enzymes, which are fully present in mature plastids. By the chemical analysis, it is observed that chloroplastids contain 90% of water, 5% of proteins, 2% of lipids and 3% of pigments.