Tag: structure of chloroplast

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

Number of membranes separating intrathylakoid space from cytoplasm is

  1. 4

  2. 3

  3. 2

  4. 1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The chloroplasts are double membrane-bound organelle that is found in the cytoplasm. They have membrane-bound thylakoids in which the photosynthesis takes place. The cytoplasm is thus separated from the intrathylakoid space by 3 membranes. i.e the 2 membranes of the chloroplast, and some membrane of thylakoid.

So, the correct option is '3'

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

Grana are

  1. Protein storing plastids

  2. Coloured plastids

  3. Stacks of thylakoids

  4. Individual thylakoids present in stroma
Reveal answer Fill a bubble to check yourself
C 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 'Stacks of thylakoids'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

In Ulothrix, the shape of chloroplast is

  1. Star-shaped

  2. Cup-shaped

  3. Girdle-shaped

  4. Diffused type
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Ulothrix is a genus of filamentous green algae which are found in marine and fresh waters habitats.
  • They have a single girdle-shaped or band-shaped chloroplast near the peripheral region of the cytoplasm (near the cell wall).
  • So, the correct answer is 'Girdle-shaped'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Structure associated with chloroplast of green algae is

  1. Pyrenoid

  2. Stigma

  3. Both A and B

  4. Endoplasmic reticulum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The structure associated with chloroplast of green algae is pyrenoid and stigma.
  • Pyrenoid refers to the cellular microcompartments present within the chloroplasts of the cell of green algae and is a major component of the algal carbon concentrating mechanism.
  • Stigma or eyespot is part of a chloroplast which is found in the motile cells of green algae and helps in finding optimal light conditions for photosynthesis.
  • So, the correct answer is 'Both A and B'.
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.'.