1. Plant Parts & Their Jobs

2. Plant Jobs Primary source of food for people and animals
Write these down…
Primary source of food for
people and animals
Produce oxygen
Absorb carbon dioxide
Continued…

3. Plant Jobs Slow wind speed Provide homes for wildlife Prevent erosion
Beautify surroundings
Furnish building materials and fuel

4. Parts of a plant Four basic parts LEAVES STEMS ROOTS FLOWERS
Draw this on your notes
Four basic parts
LEAVES
STEMS
ROOTS
FLOWERS

5. LEAVES

6. LEAVES The greenest part of the plant Act as solar collectors
Large leaves= areas of little sunlight
Tiny leaves = bright sunlight
Needles = no water loss

7. LEAVES - structure Epidermis - top and bottom tough layer
Pallisade Layer - most cells with chloroplasts are found here
Spongy Layer - gas exchange through stomata

8. LEAVES - 2 functions Make Food (sugar) in the chloroplasts
Gas Exchange
take in carbon dioxide and
release oxygen and water
vapor
Stomata on the bottom of the leaves have guard cells that open and close as they fill up with water.

9. LEAVES - photosynthesis
Plants make sugar using
CO2 (from air)
and
H2O (from roots)
as ingredients.

10. STEMS

11. STEMS - two main functions
Liquid transport
xylem cells carry water
& minerals up phloem cells carry food
down
Support

12. STEMS – example Dicot plants such as a bean (xylem & phloem in a ring under the bark)
Cambium
Phloem
Xylem

13. STEMS – example Monocot plants such as a corn stalk (vascular bundles scattered throughout the setm)
Phloem Cells
Xylem tube

14. What Good Are Stems to humans?
FOOD-rhubarb, celery, white
potato
WOOD – building and fuel
PAPER

15. Types of Modified Stems
Bulbs: (onion)
Tubers: (potato)
Stolons: above ground runner
(strawberry)
Rhizomes: below ground runners (field
bindweed or creeping jenny)

16. ROOTS

17. ROOTS - functions Anchor plant Suck up water and minerals
Store Sugar (radish, carrot, beets)
Reproduction (eyes
on potatoes)

18. ROOTS structure
root cap-protects tender cell division area as the root pushes through soil

19. ROOTS – root hairs
Water and minerals move into root by osmosis / diffusion

20. FLOWERS, FRUITS, SEEDS

21. FLOWERS, FRUITS, SEEDS Main jobs involve reproduction
Attract pollinators
Disperse pollen
Fertilization
Disperse seeds

22. FLOWERS, FRUITS, SEEDS POLLEN normally carried by insects or wind
FRUITS & SEEDS normally carried by wind, animals, water or shot away from parent plants (projectiles)