Tag: photosynthetic pigments

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Questions Related to photosynthetic pigments

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

An association is found between the wavelengths of light absorbed by chlorophyll and wavelengths of length that are associated with the greatest amount of oxygen released by plants. Based on the observation, the function of chlorophyll is

  1. It plays a role in cell respiration.

  2. It plays a role in the light reactions of photosynthesis.
  3. It takes part in $H _2O$ release.
  4. It takes part in $CO _2$ fixation.

  5. It generates energy.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorophyll absorbs sunlight of particular wavelength that causes spitting of water at water splitting complex of photosystem II and oxygen gas is released. PSI absorbs light below 680nm while PS II is activated by light below 700 nm; so plants exhibit maximum amount of oxygen released when illuminated with simultaneous exposure to red and far red light. Fixation of $CO _2$ occurs during the dark reaction. Thus, the correct answer is B.

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

Total amount of dry weight of photosynthate produced by all type of plants per annum is

  1. 1.7 million tonnes

  2. 17 million tonnes

  3. 17000 million tonnes

  4. 170000 million tonnes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total amount of dry weight of photosynthate produced by all type of plants per annum is 170000 million tonnes. There are several factors, which limit the formation of dry weight such as reduced nitrogen fixation which will result in reduction of dry weight.

Therefore, the correct answer is option (D).

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

The site of photosynthesis in blue green algae is

  1. Chromatophores

  2. Mitochondria

  3. Chloroplast

  4. Root hair
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blue green algae are prokaryotic orgnanisms and lack membrane bound organelles. Mitochondria and cholroplast are double membrane bound organelles of eukaryotes that serve as site of aerobic respiration and photosynthesis respectively. Chromatophores are the pigment containing membranous structures that serve as site for photosynthesis in BGA. Correct answer is A.

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

The term thylakoid was coined by

  1. Arnon

  2. Park and Biggins

  3. Menke

  4. Willstatter
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Thylakoid (internal photosynthetic membranes) is a membrane-bound compartment present within the cellular organelle called chloroplast, they are also present in cyanobacteria.
  • It is a site for the light-dependent reactions of photosynthesis. 
  • It is made up of a thylakoid membrane which surrounds the thylakoid lumen.
  • The term thylakoid was coined by Menke in the year 1962.
  • So, the correct answer is 'Menke'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Intact chloroplasts can be isolated with the help of

  1. Alcohol

  2. Acetone

  3. Carbon disulphide

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

Intact chloroplast from green leaves can be isolated by the acetone isolation method. The membranes of the chloroplast are proteinaceous in nature so it can be easily isolated by acetone. The samples obtained are loaded to the chromatography apparatus, which shows bands on the chromatogram.

So, the correct option is B. 

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

Thylakoids occur inside

  1. Mitochondria

  2. Chloroplasts

  3. Golgi apparatus

  4. Endoplasmic reticulum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Thylakoid (internal photosynthetic membranes) is a membrane-bound compartment present within the cellular organelle called chloroplast, they are also present in cyanobacteria.
  • It is a site for the light-dependent reactions of photosynthesis. 
  • It is made up of a thylakoid membrane which surrounds the thylakoid lumen.
  • So, the correct answer is 'Chloroplasts'.
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'.