In flowering plants, male and female reproductive structures can be found in the same individual plant. The organ of sexual reproduction is the flower. Male gametes are found in pollen grains and ...

Summary The pollen grains of Passiflora coccinea Aubl. (Passifloraceae) present a complex largely reticulated exine. The layers of exine and the different celular structures normally found in the ...

Honeybees along with 1,500 other insect species pollinate plants in the UK. Self-pollination: The pollen grain lands on the same flower it originated from. Cross-pollination: The pollen grain ...