Look at the tall central column of this cut-open flower. What does the sticky tip at its top do during reproduction?

An arrow marks the swollen base of the central column in this cut-open flower. What happens inside that swollen part?

An arrow points to the small sac carried at the tip of one of the slender stalks inside this flower. What is that sac's job?

An arrow points to the small green structure on the outside of this flower, below the petals. What does it do?

Inside a flower, a slender stalk holds a pollen sac up and outward, where a visiting insect brushes against it. What is that stalk called?

After a pollen grain germinates, its tube grows down through a slender column of tissue to reach the ovary. What is that column called?

Which of these events happens LAST in the reproduction of a flowering plant?

A researcher cuts every anther out of a flower bud and seals the bud in a fine mesh bag. The flower opens, wilts, and its base never swells. Which event did the bag and the cutting prevent?

At which moment has fertilization taken place in a flowering plant?

The petals of an apple blossom drop off and the base of the flower begins to swell over the following weeks. What is going on?

A seed lies in cold soil all winter and sprouts in the spring. Which event must have happened before that seed existed at all?

A grass plant has flowers with no petals and no scent. Its anthers dangle outside on long filaments, and its stigmas are large and feathery. What carries its pollen?

A flower opens only after dark. It is large and white, gives off a strong sweet scent, and holds its nectar at the bottom of a long narrow tube. What pollinates it?

A flower hangs on a stem with no landing platform. It is bright red, has no scent at all, and holds a large volume of thin nectar deep inside a sturdy tube. Which visitor most likely pollinates it?

A large flower is dull purple-brown and mottled like raw meat, smells strongly of rotting flesh, and is warm to the touch. What is it attracting?

Look at the seed in the picture. How is it most likely to be carried away from the parent plant?

Look at the dry fruit in the picture. How does it most likely reach a new place to grow?

Look at the fruit in the picture. What does its dry papery wing do as the fruit falls from the tree?

Look at the cut fruit in the picture. Its thick husk is packed with dry fibers and air spaces. Where is this fruit most likely to travel?

A shrub makes small berries that turn bright red and sweet as they ripen, and each berry holds seeds with a tough coat that is not broken down in a gut. How are these seeds dispersed?