Write the reasons

Dear student,
Please find below the answer:

i. Sunflower has brightly colored yellow petals. This is in order to attract the insects for pollination.

ii. Stigma of the maize is feathery and hand out of the flower so as to carry out wind pollination in an easy way. The  Small dusty pollen grains are easily caught by the feathery stigma of the carpel.

iii. Flowers that bloom at night has sweet fragrance because during the day flowers have bright colours to attract insect but at night that is not visible to pollinators and hence, they produce nectar and some sweet fragrance to attract them.

Hope this clears your doubt.
Regards.