WEBSITE IS UNDER REMODELING
Unit 12 biology
FUNCTIONS
FLOWER
- Attract pollinators such as insects, birds, and bats
- Site of sexual production
- Forms fruits that carry seeds
FEMALE REPRODUCTIVE STRUCTURES
- Pistil – Reproductive structure at the top of the plant with sticky tips to trap pollen
- Style – Slender tube that transports pollen from stigma to ovary
- Ovary- contains ovule; and helps develop fruit
- Ovules – contain the egg
MALE reproductive StRUCtuRES
- Stamen; male reproductive structure
- Filament – thin stalk; Supports the anther
- Anther – knob-like structure produced pollen
- Pollen – become sperms
FLOWER STRUCTURE & POLLINATION
- Sepals – encloses and protect flower before it blooms
- Petals – usually colorful and scented to attract pollinators
- Pollination – pollen from an anther is caught by the stigma, travels to the ovules in the ovary
- Pollination results in fruit with seeds.
FUNCTION OF SEED
- Houses the embryo that will eventually become a new plant
STRUCTURE OF SEED
- The embryo is the newly developing plant
- The seed coat protects the internal parts of the seed during a period called dormancy
- Endosperms serve as a food source because the embryo has no leaves and does not photosynthesize.
GYMNOSPERM VS ENDOSPERMS
- Gymnosperm contains no flower but still has male and female parts – Endosperms have flowers and both sexes
SEED GERMINATION
- The seed coat bursts open and sets growth into motion (happy plant growing)
SEED DISPERSAL
- Seeds go through to places by wings, animals and insects, air/wind, water,
WATER DISPERSAL
- Seeds that travel in water need to float
Hitchhiking
- seeds with sticky surfaces or pointy barbs easily get stuck on animals as they pass by
Fruits
- seeds are hidden in fruits that are eaten by animals. They pass through the digestive system of animals and are deposited in the animal feces.