Correct option is B
Correct Answer: (2) B and C only
Explanation – Phloem Transport in Plants:
The phloem is responsible for the translocation of photosynthates, mainly sugars from source (like leaves) to sink (roots, fruits, seeds, etc.). Let’s evaluate each statement:
A."Only reducing sugars are translocated."
Incorrect
Reducing sugars (like glucose, fructose) are not primarily transported via phloem.
Non-reducing sugars, especially sucrose, are the main transport sugars in phloem sap.
Sucrose is non-reducing, stable, and ideal for long-distance translocation.
B."Non-reducing sugars are generally translocated."
Correct
Non-reducing sugars, especially sucrose, are the main form of carbohydrate translocated in phloem.
They are osmotically stable and chemically less reactive.
C."Sucrose and raffinose are generally translocated."
Correct
Sucrose is the most common sugar translocated in plants.
In some species (like cucurbits), raffinose family oligosaccharides (RFOs) such as raffinose, stachyose are also translocated.
D."Only D-glucose and D-fructose are translocated."
Incorrect
While glucose and fructose are common metabolic sugars, they are not efficiently translocated in most plants.
They are reducing sugars and more reactive — less preferred for phloem transport.
