Tag: photosynthetic pigments

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Questions Related to photosynthetic pigments

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

Number of grana present in a chloroplast is

  1. 10-20

  2. 20-30

  3. 30-40

  4. 40-60
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A thylakoid refers to the membrane-bound internal compartment within the chloroplasts of a plant cell and cyanobacteria.
  • It is a site for light-dependent reactions of photosynthesis. 
  • It is made up of a thylakoid membrane which surrounds the thylakoid lumen.
  • A stack of thylakoid disk is organized to form grana.
  • Within a chloroplast of a plant cell, there are about 40- 60 grana and each granum are composed of 10 to 100 thylakoids.
  • So, the correct answer is '40-60'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Particles of thylakoid membranes involved in ATP synthesis are called

  1. Quantasomes
  2. $CF _0-CF _1$

  3. Photosystems

  4. Pyrenoids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • The particles of thylakoid membrane responsible for ATP synthesis is a CF$ _1$ -CF$ _O$-ATP synthase.
  • It is embedded in the thylakoid membrane where the CF$ _1$-part is attached to the stroma. 
  • Therefore, ATP synthesis occurs on the stromal side of the thylakoid where the ATP molecules are required for carrying out the light-independent reactions of photosynthesis.
  • So, the correct answer is 'CF$ _0$−CF$ _1$'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Shape of chloroplast in higher plant is

  1. Discoid

  2. Girdle-shaped

  3. Reticulate

  4. Cup-shaped
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The chloroplast is a discoid plastid which contains chlorophyll (green pigment) within the thylakoid membranes of the organelle.
  • This organelle is present in the green parts of plants where photosynthesis takes place.
  • It is the main site of synthesis of glucose by the process called photosynthesis.
  • The chlorophyll pigment captures the sunlight and converts it into chemical energy and thus, helps in the process of photosynthesis.
  • So, the correct answer is 'Discoid'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Number of thylakoids in a granum is 

  1. 10-100

  2. 5-10

  3. 100-200

  4. 200-500
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • A thylakoid refers to the membrane-bound internal compartment within the chloroplasts of a plant cell and cyanobacteria.
  • It is a site for light-dependent reactions of photosynthesis. 
  • It is made up of a thylakoid membrane which surrounds the thylakoid lumen.
  • A stack of thylakoid disk is organized to form grana.
  • There are about  10 to 100 thylakoids within a granum and about 40- 60 grana in a plant cell.
  • So, the correct answer is '10-100'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Quantasomes occur in

  1. Stroma

  2. Grana/chloroplast

  3. Golgi body

  4. Mitochondria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Quantasomes occur in the Grana/chloroplast.
  • Quantasomes can be defined as small particles found in the thylakoid membrane of the chloroplasts.
  • These particles are embedded in a paracrystalline form on the surface of thylakoid discs in chloroplasts.
  • So, the correct answer is 'Grana/chloroplast'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

All types of plastids possess essentially the same structure because they

  1. Perform the same function.

  2. Store food materials like starch, fat and protein.

  3. Occur in aerial parts.

  4. Can transform from one form to another.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plastids are considered as sac-like organelles, generally involved in the formation or storage of food. These are chloroplast, chromoplast and leucoplast and are same in their structure to transform into one another during the requirement.

So the correct option is 'Can transform from one form to another.'.

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

Lipid content of chloroplast is

  1. 20-30%

  2. 5-10%

  3. 4-5%

  4. 1-2%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Plastids are a pigment containing double membrane-bound organelle which is the site of manufacture and storage of chemical compounds.
  • The chloroplast is a plastid which contains the green coloured pigment called chlorophyll and are present in the green parts of the plants that take part in the process called photosynthesis.
  • The outer chloroplast envelope is made up of lipid (20%-30%).
  • So, the correct answer is '20-30%'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

The packet of thylakoids in a chloroplast is called

  1. Fret channels

  2. Granum

  3. Stroma thylakoid

  4. Photosynthetic thylakoid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • A stack of thylakoid discs is organized to form grana.
  • A thylakoid refers to the membrane-bound internal compartment within the chloroplasts of a plant cell and cyanobacteria.
  • It is a site for light-dependent reactions of photosynthesis. 
  • There are about  10 to 100 thylakoid discs within a granum and about 40- 60 grana in a plant cell.
  • So, the correct answer is 'Granum'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Electron carriers involved in photophosphorylation are located in

  1. Outer chloroplast membrane

  2. Inner chloroplast membrane

  3. Stroma

  4. Thylakoid membranes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The photophosphorylation reaction involves the conversion of ADP to ATP in the presence of sunlight. This takes place in the thylakoid membrane. The photosystem I and II that involves the electron carriers; are present in the thylakoid membranes of the chloroplast. here the light reaction of photosynthesis takes place.

So, the correct option is 'Thylakoid membrane'

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

Stroma is the ground matrix of

  1. Lysosomes

  2. Oxysomes

  3. Ribosomes

  4. Chloroplast.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stroma, refers to the colourless fluid surrounding the grana within the chloroplast. Within the stroma are grana, stacks of thylakoids, the sub-organelles, where photosynthesis is commenced before the chemical changes are completed in the stroma. The internal space enclosed by the chloroplast double membrane but excluding the thylakoid space. This space, filled with a colorless hydrophilic matrix, contains DNA, ribosomes and some temporary products of photosynthesis also known as chloroplastic stroma.