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  4. The given figure shows the diagramatic representation of the Hatch Slack pathway few labelling are marked as P, Q and R <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/3ee74240b69be7162773045d53cd578d-.png /> Which of the following option shows the correct labeling of P, Q, and R ?

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Q. The given figure shows the diagramatic representation of the Hatch & Slack pathway few labelling are marked as $P, Q$ and $R$
image
Which of the following option shows the correct labeling of $P, Q,$ and $R$ ?

Photosynthesis in Higher Plants

Solution:

In the given diagrammatic representation of Hatch and Slack pathway (also known as $C _4$ pathway), the steps marked as $P , Q$ and $R$ are respectively $C _4$ acids, decarboxylation and $C _3$ acids. It is a metabolic cycle involved in the non-light-requiring phase of photosynthesis in certain plants having specific metabolic and anatomical modifications in their mesophyll and bundle sheath cells which facilitate the temporary fixation of carbon dioxide $\left( CO _2\right)$ into four-carbon organic acid. These acids are then broken down to three-carbon organic acids along with $CO _2$ in bundle sheath cells, where this freed $CO _2$ is then fixed into carbohydrates in a normal Calvin cycle pathway.