PLANTS Parts of a Plant Root Function Anchors

PLANTS

Parts of a Plant ? ? ?

Root Function: • Anchors plant in soil • Takes up water and minerals from soil

Root hairs Function: • Increase surface area • Much greater absorption of water and minerals

Stem Function: • Supports leaves, flowers, and fruit • Transports water & minerals from roots to leaves

Leaves Function: • Site of photosynthesis • Site of gas exchange

Leaves Site of photosynthesis • Large, flat areas that absorb sunlight • Make sugar (glucose) glucose

Leaves Site of gas exchange • Gases CO 2 and O 2 enter and exit thru stomata Stomata – small openings on the surface of leaves (underside) Photosynthesis Recall, plants also “breath”

Do the stomata stay open all the time for maximum photosynthesis? No, or else the plant would lose a lot of water vapor and dry up.

Guard cells open and close the stomata to minimize water loss.

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Flower Function: • Site of sexual reproduction • Produces egg and sperm

(contains the egg)

Pollen contains male gamete (sperm) ovary Contains female gamete (egg) fertilization

After fertilization, the ovary develops into the fruit (contains the egg)

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Fruit A fruit is a ripen ovary and contains the seed or embryo.

Fruit Function: • Protects the seed(embryo) • Helps disperse the seed.

Seed • Contains the embryo • Contains stored food to nourish the embryo

A plant growing from a seed.

Pine trees produce cones, not fruit. Cones contain seeds.