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Double Fertilisation
Question

A tetraploid female flowering plant and a hexaploidy male flowering plant are crossed, endosperm will be

Easy
Solution

Tetraploid female plant will be having tetraploid secondary nucleus and the male plant produces triploid male gametes. Triploid male gamete and tetraploid secondary nucleus fuse during double fertilisation and forms 7n primary endosperm nucleus that forms heptaploid endosperm. 

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