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  4. Assertion: In electron transport system, the electrons are passed on to oxygen resulting in the formation of H2O. Reason: Oxygen is the ultimate acceptor of electrons.

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Q. Assertion : In electron transport system, the electrons are passed on to oxygen resulting in the formation of $H_2O$.
Reason : Oxygen is the ultimate acceptor of electrons.

Respiration in Plants

Solution:

Oxygen is the terminal electron acceptor of respiratory chain. In electron transport system, electrons are passed on from one carrier to another and ultimately to oxygen and at the end of this chain, one molecule of water is produced as :
$\frac{1}{2}O_{2} + 2H^{+} + 2e^{-} \to H_{2}O$