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(B) The pressure-flow hypothesis (or mass flow hypothesis) explains the translocation of sugars in the phloem from a source to a sink.$1$. $A$ source

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$Q$

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(B) The pressure-flow hypothesis (or mass flow hypothesis) explains the translocation of sugars in the phloem from a source to a sink.$1$. $A$ source is any part of the plant that synthesizes food (sucrose),such as mature leaves.$2$. $A$ sink is any part of the plant that needs or stores food,such as roots,fruits,or developing buds.$3$. In the given figure,$Q$ represents a mature leaf,which is actively producing sugars (photosynthesis),thus acting as the source.$4$. $P$ (developing bud) and $S$ (root) are acting as sinks where the sugar is being utilized or stored.$5$. $R$ represents the phloem tissue through which the translocation occurs.Therefore,$Q$ is the source.

The following figure illustrates the pressure-flow hypothesis. Which of the following represents the source?

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