Choose the correct option regarding transport of sugars in phloem.
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a
Loading of sugars into sieve tube is an active process while unloading in passive.
b
Loading of sugars into sieve tube is a passive process while unloading in active.
c
Both loading and unloading of phloem is done passively.
d
Both loading and unloading of phloem is done actively.
answer is D.
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Detailed Solution
The movement of sugars in the phloem begins at the source, where sugars are loaded (actively transported) into a sieve tube.At the sink, incoming sugars are actively transported out of the phloem and removed as complex carbohydrates.