Discussion
Brassinosteroids are the extract of pollen grains of:
Answer: C
Brassinosteroids were first extracted from the pollen of rape (Brassica napus). They are plant growth hormones that promote cell elongation.
Potato, radish and onion are not the source.
Brassinolide, the first brassinosteroid, was isolated from rape pollen in the 1970s. These steroids promote cell elongation and division and increase stress tolerance in plants.
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