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B
Micro and megaspore
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C
Zygote
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D
Pinus and plant
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Solution
The correct option is B
Micro and megaspore
In the life cycle of a conifer, the sporophyte (2n) phase is the longest phase. The gametophytes (n), microspores and megaspores, are reduced in size. This phase may take more than one year between pollination and fertilization while the pollen tube grows towards the megasporocyte (2n), which undergoes meiosis into megaspores. The megaspores will mature into eggs (n).