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B
Siphonogamy
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C
Both A and B
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D
Chalazogamy
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Solution
The correct option is A Both A and B
Zoidogamy is the tem used when the ciliated male gametes participates in the fertilization. Siphonogamy is basically used for the phenomena of generation of pollen tube in the cycas. In the archegonium chamber, the pollen tube burst to release the ciliated male gamets which fuses with the female gamete to form zygote.