Question 9 What is the final destination of the electrons removed from water? O

Question

Question 9 What is the final destination of the electrons removed from water? O Oxygen, the electron acceptor O Carbon Dioxide (CO2) O NADPH, the electron carrier O Glucose, sugars They are released as photons D Question 10 How is ATP made during the light dependent reactions? OEnergy from photons is directly transferred from chlorophiylls to ATP O Energy from photons is transferred to electrons and then used to create a proton gradient Energy from water is transferred to electrons and then transferred to ATP Energy from photons is transferred to water, electrons are then transferred to ATP synthase

Explanation / Answer

Hi Answer:

Q.9. What is the final destination of the electrons removed from water?

Answer: Option D. [Glucose, sugar]

Explanation: An electron first begins photosynthesis in Photosystem II and after excitation of PSII by photons of light and electron get excited and transferred to electron transport chain and carried a series of reaction and energy is released. Then is taken up by PSI and returned to higher energy level. After that electron moves to the second series of reactions in second electron transport chain to reduce the coenzyme NADP to NADPH. After that finally, NADPH gives its electrons to electrons along with the hydrogen to Calvin cycle to form Glucose.

Q. 10. How is ATP made during the light- dependent reactions?

Answer: Option B [Energy from photons is transferred to electrons and then used to create a proton gradient]

Explanation: As we know electron moves from PSII to first ETC and absorbed by PSI and move to second ETC where energy is used to create the concentration gradient between the protons of stroma and the thylakoid proton concentration. This raises the proton concentration in thylakoid then with the help of channel protein (ATP synthase) hydrogen ions are passed which maintain the balance in proton concentration gradient and at this stage, the energy from proton/ electrons is used to add a phosphate group to ADP to produce ATP.

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