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Answer 1

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2=answer is given

3= Definition of double fertilization. : fertilization characteristic of seed plants in which one sperm nucleus fuses with the egg nucleus to form an embryo and another fuses with polar nuclei to form endosperm.

4=The calyx is that part of the flower which is attached to the stem. The petals grow inside the calyx. It has sepals which form a whorl around the flower and protect it.

After fertilization mostly the calyx falls off as its function of protecting the flower or its reproductive parts is over. Otherwise it dries up or becomes shrivelled.