Tag: photosynthetic pigments

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Questions Related to photosynthetic pigments

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'

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

Which one is not character of antennae?

  1. To make photosynthesis more efficient

  2. To make wider range of absorption of incoming light

  3. Provide electron to primary electron acceptor of photosystem

  4. Reaction center is not part of it
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The light harvesting complexes are made up of hundreds of pigment molecules bound to proteins. Each photosystem has all the pigments (except one molecule of chlorophyll a) forming a  light harvesting system also called antennae. These pigments help to make photosynthesis more efficient by absorbing different wavelengths of light. The single chlorophyll a molecules form the reaction center. Therefore, the reaction center is not a part of antennae. 

So, the correct option is 'Provide electron to primary electron acceptor of photosystem'.

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

Read the given statements A & B and choose the correct option.
A. The ribosomes of the chloroplasts are smaller than the cytoplasmic ribosomes.
B. Chloroplasts can synthesise some of their proteins but they receive other proteins from cytoplasm.

  1. Only statement A is correct.

  2. Only statement B is correct.

  3. Both statements are correct.

  4. Both statements are incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Chloroplast ribosomes are similar to those found in the prokaryotes that is 70s type. Eukaryotic ribosomes which are found in the cytoplasm are of 80stype.

B. Most chloroplast and mitochondrial proteins, however, are synthesized outside the organelle on cytosolic ribosomes that are not bound to the rough endoplasmic reticulum.
So the correct option is 'Only statement A is correct'.

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

In a chlorophyll molecule, the magnesium is situated in the

  1. corners of porphyrin

  2. centre of porphyrin

  3. isocyclic ring

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

A chlorophyll molecule has a hydrophobic "tail" that embeds the molecule into the thylakoid membrane. The "head" of a chlorophyll molecule is a ring called a porphyrin. The porphyrin ring of chlorophyll, which has a magnesium atom at its centre, is the part of a chlorophyll molecule that absorbs light energy.

So, the correct option is 'Centre of porphyrin'.