Insect pollinated flowers have pollen grain.

Pollination:

1. Pollination is the process of pollen grains being transferred from a flower's anthers to its stigma.
2. Several insects (like bees, and butterflies) and birds help in the pollination of flowers.
3. Rose, marigold, sunflower, and China rose are some examples of insect-pollinated flowers.
4. Insect-pollinated flowers are large and brightly coloured. A number of them have sugary nectar to attract insects.
5. Flowers have sticky pollen grains which get stuck to the body of insects and get carried away to other flowers.

Final answer: Insect pollinated flowers have sticky pollen grain.