This set of Cell Biology Questions and Answers for Campus interviews focuses on “Chloroplast Structure and Function – Photosynthetic Units and Reaction Centres”.
1. In which part of the plant, does photosynthesis takes place?
Explanation: Quantosomes are sub cellular organelles present in the membrane of thylakoid in the chloroplast. Their function is to absorb light energy and start the photosynthesis mechanism.
2. Which pigment protects the photosystem from ultraviolet radiation?
a) Chlorophyll a
b) Chlorophyll b
Explanation: Carotenoids are coloured pigments found in plants and some other prokaryotic algal cells. Carotenoids do not directly contribute to the photosynthesis, but they protect the plants from UV radiation.
3. What is the name of the book written by Jan Ingenhousz, which explains the basis of photosynthesis?
a) Experiments upon Fruits
b) Experiments upon Vegetables
c) Experiments upon Plants
d) Experiments upon Animals
Explanation: Jan Ingenhousz in the year 1779 carried out around 500 experiments to prove the mechanism of photosynthesis. He observed that plants absorb carbon di oxide and evolve oxygen with the help of light energy.
4. Photosystem II happens before photosystem I.
Explanation: Photosystem II happens before photosystem I but the name I and II denotes the order of their discovery. The electrons usually flow from photosystem II to photosystem I.
5. Which of the following amino acid is helpful in the synthesis of plastoquinone?
Explanation: Plastoquinone is a branched chain unsaturated quinone, which helps in the electron transport chain of photosynthesis. P-hydroxyphenylpyruvate is synthesized from tyrosine which then converts finally to plastoquinone.
6. What is the other name of Plastoquinol – plastocyanin reductase?
a) Cytochrome b4f complex
b) Cytochrome b5f complex
c) Cytochrome b6f complex
d) Cytochrome b5g complex
Explanation: Plastoquinol – plastocyanin reductase is also known as the Cytochrome b6f complex. It is an enzyme that helps to transfer electrons from Photosystem II to Photosystem I.
7. What is the maximum wavelength of light photosystem II can absorb?
Explanation: Photosystem II primary donor or P680 is a complex of many pigments which has the potentiality to absorb maximum light at 680nm. It is also known to be the strongest biological oxidizing agent.
8. Which of the following Vitamins act as an electron acceptor in light dependent photosynthesis?
a) Vitamin A
b) Vitamin D
c) Vitamin E
d) Vitamin K
Explanation: Vitamin K also known as phylloquinone acts as an electron acceptor during photosynthesis. It donates a hydrogen molecule and helps in the electron transport chain.
9. During photosynthesis, how many chlorophyll molecules are required to produce one oxygen molecule?
Explanation: Scientists Emerson and Arnold found that in a photosynthetic reaction 2500 molecules of chloroplast is required to produce one molecule of oxygen. They also require eight photons in the process of producing one molecule of oxygen.
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