Pollination and fertilization
Answers are for parents and teachers.
1
Show the differences between insect- and wind-pollinated flowers in a table.
Insect: bright, scented, nectar, less pollen; wind: small, scentless, very much pollen.
2
Draw a diagram of double fertilization and label the parts.
Stigma, pollen tube, style, ovary, ovule, egg and central cell, 2 sperms.
3
If a cotton boll has 28 seeds, how many ovules were fertilized?
28
4
Why do bees in an orchard raise the harvest? Write 2–3 sentences.
They pollinate flowers; more flowers are fertilized and set fruit.
5
Why does maize, a monoecious plant, give a gappy cob in windless weather?
Pollen does not reach the silks of all pistillate flowers, some stay unfertilized — gaps remain.