Tag: plastids

Questions Related to plastids

In chloroplast, the highest number of protons are found in

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Antenna complex

  2. Stroma

  3. Lumen of thylakoids

  4. Inter-membrane space

Show answer
Correct Option: C
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'.

Chlorophyll molecules are located in

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Thylakoid membrane

  2. Thylakoid lumen

  3. Stroma

  4. Inner chloroplast membrane

Show answer
Correct Option: A
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'.

Thylakoids possess photosynthetic units called

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Quantasomes

  2. Glyoxysomes

  3. Polysomes

  4. Ribosomes

Show answer
Correct Option: A
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'.

Quantasomes occur on the surface of

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Cristae

  2. Plasmalemma

  3. Nuclear envelope

  4. Thylakoids

Show answer
Correct Option: D
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'.

Abscises acid is synthesized in.

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Chloroplasts

  2. Endoplasmic reticulum

  3. Ribosome's

  4. Peroxisomes

Show answer
Correct Option: A

Copper-containing blue protein found in the chloroplast is the.

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Plastocyanin

  2. Plastoquinone

  3. Cytochrome f

  4. Ferredoxin

Show answer
Correct Option: A

Extrusion or passage of chromatin from one cell into the cytoplasm of the adjoining cell is due to.

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Cytomixis

  2. Cytokinesis

  3. Inversions

  4. Translocation

Show answer
Correct Option: A

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

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. 340-450 nm

  2. 450-950 nm

  3. 500-600 nm

  4. 400-700 nm

Show answer
Correct Option: D
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'.

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

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Stroma

  2. Lumen

  3. Intermembrane space

  4. Thylakoid membrane

Show answer
Correct Option: A

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

biology protectors of biosphere structure of chloroplast plastids photosynthetic pigments

  1. Grana

  2. Stroma

  3. Thylakoids

  4. Cristae

Show answer
Correct Option: C
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'