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(D) The role of phloem in the translocation of food (sucrose) can be demonstrated using several experimental techniques:$1$. Tracer technique: Using r

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All of the above

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(D) The role of phloem in the translocation of food (sucrose) can be demonstrated using several experimental techniques:$1$. Tracer technique: Using radioactive isotopes like $^{14}C$ to track the movement of photosynthates.$2$. Sap analysis technique: Analyzing the composition of phloem sap obtained through aphid stylets or incisions.$3$. Chemical analysis: Examining the chemical composition of the phloem contents to confirm the presence of sugars.Therefore,all the mentioned techniques are used to prove that phloem is the element responsible for food translocation.

By which of the following techniques can we prove that phloem is the tissue responsible for food translocation?

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Analogy type questions:
$(1)$ In Xylem : Vessel :: In Phloem : ..........
$(2)$ Synthesis of food : Source :: Regions of need : ...........

Movement of substances in xylem is unidirectional, while in phloem it is bidirectional. Explain.

The concentration of xylem sap is:

Sinks are related to

In phloem,the flow is always from

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