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B
onion
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C
cotton
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D
pea
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Solution
The correct option is A cotton The upper swollen part of the stamen is called anther. It contains one or two sac-like structures called anther lobes. A monotonous anther has one lobe. Basifixed anthers are attached to the filament at the base and pointing away from the filament. Cotton is characterized by the presence of monothecous and basifixed anthers.