Tag: structure of chloroplast

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Questions Related to structure of chloroplast

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

In chloroplast, the highest number of protons are found in

  1. Antenna complex

  2. Stroma

  3. Lumen of thylakoids

  4. Inter-membrane space
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During photosynthetic electron transport, protons (H$^+$) accumulate in the thylakoid space. These protons are released into thylakoid space after each split of water molecule during photooxidation and after each electron transport between PQH$ _2$ to cytochrome-f. Increase in the number of protons in the thylakoid space results in an increase in a proton gradient.

Hence, the correct answer is 'Lumen of thylakoids'.

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

Chlorophyll molecules are located in

  1. Thylakoid membrane

  2. Thylakoid lumen

  3. Stroma

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

A) The green pigment chlorophyll is located within the thylakoid membrane.

B) The thylakoid lumen does not contain chlorophyll.
C) The stroma does not contain any pigments.
D) The inner chloroplast membrane does not contain any pigments.
So the correct answer is 'Thylakoid membrane'.

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

Thylakoids possess photosynthetic units called

  1. Quantasomes

  2. Glyoxysomes

  3. Polysomes

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

Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts.

So, the correct option is 'Quantasomes'.

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

Quantasomes occur on the surface of

  1. Cristae

  2. Plasmalemma

  3. Nuclear envelope

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

Quantasomes are composed of lipids and proteins that include various photosynthetic pigments and redox carriers. These are the particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. They are embedded in a paracrystalline array on the surface of thylakoid discs in chloroplasts.

So, the correct option is 'Thylakoids'.

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

Photosynthetic Active Radiation (PAR) has the following range of wavelengths

  1. 340-450 nm

  2. 450-950 nm

  3. 500-600 nm

  4. 400-700 nm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Photosynthetic Active Radiation (PAR), designates the special range of solar radiations from 400 to 700 nm that photosynthetic organisms are able to use for the process of photosynthesis.
SO, the correct answer is '400-700 nm'.
Multiple choice biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

Lowest pH inside chloroplast in day time must be found in _______________.

  1. Stroma

  2. Lumen

  3. Intermembrane space

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

During photosynthesis in the light, protons are actively pumped from the stroma into the thylakoid lumen by the electron transport chain. This accumulation of protons in the lumen causes the pH there to drop to its lowest levels.

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

The individual flattened stacks of membranous structures inside the chloroplasts are known as:

  1. Grana

  2. Stroma

  3. Thylakoids

  4. Cristae
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A thylakoid is a membrane-bound compartment inside chloroplasts. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen. Chloroplast thylakoids frequently form stacks of disks referred to as grana. So the correct option is ' Thylakoid'