1. Plant
Systems
7th Grade Science

2. LEARNING OBJECTIVES
Understand the basic structure and function (job) of the tissues, organs, and organ systems of plants
Consider the similarities between animal systems and plant systems

3. Plant CELLS (review)
Have all the same basic parts as animals EXCEPT also have a CELL WALL and CHLOROPLASTS
Larger vacuoles for storing water
Usually have a more square shape

4. Plant TISSUES
Tissues = cells that are working in a team to do the same job (function)

5. Xylem & Phloem Tissue Are the “circulatory system” of the plant
Both are TUBES used for transport

6. Usually xylem tubes are larger (in diameter)
Xylem & Phloem Tissue
Xylem (pronounced zi-lem) tissue is made of tubes that carry WATER and MINERALS
(*usually upward from the roots to the rest of the plant)
Usually xylem tubes are larger (in diameter)

7. Xylem & Phloem Tissue
Phloem (pronounced flo- em) tissue is made of tubes that carry FOOD (or SUGARS)
(*usually downward from the leaves to the rest of the plant)
Phloem Tube

8. a vein (made of xylem & phloem tissue)
Form the “veins” in leaves
Also called “vascular” tissue
Each line =
a vein (made of xylem & phloem tissue)

9. Xylem & Phloem Tissue
Xylem Tissue
Phloem Tissue

10. Xylem & Phloem Tissue

11. Plant ORGANS
Organs = 2 or more tissues working together to do the same job (function)

12. Roots Leaves Flowers Stems
Plants, like animals, have 4 main systems that helps them function as a whole.
Roots
Leaves
Flowers
Stems

13. ROOTS Jobs of a Root: Absorb water & minerals from the soil.
Transport water & minerals up to stem & leaves.
Anchor the plant in soil.
Store food (ex. carrot, radish, & turnip)

15. STEMS Jobs of a Stem: To support leaves and flowers
To transport water, minerals, and food
To store and sometimes make food

16. STEMS

17. LEAVES Jobs of Leaves Take in sunlight to make food (photosynthesis)
Chloroplasts are the organelle that make this possible in plant cells

18. LEAVES
Chlorophyll is the molecule in green parts of plants that uses the energy in sunlight to turn water (H2O) and carbon dioxide gas (CO2) into sugar (glucose— C6H12O6) and oxygen gas (O2). This process is called photosynthesis.

19. LEAVES
Leaves come in many sizes and shapes; they are often used to help identify plants.
Plant spines (like cactus spines) are actually modified leaves

20. Label your diagram as we go! (Add the numbers and arrows!)
LEAVES 2
A leaf is made of many layers that are sandwiched between two layers of tough skin cells (called the epidermis). Label as #1
The epidermis also secretes a waxy substance called the cuticle (2). These layers protect the leaf from insects, bacteria, and other pests. 1 1

21. LEAVES 4
Among the epidermal cells are pairs of sausage- shaped guard cells (3). Each pair of guard cells forms a pore (called stoma; the plural is stomata-4).
Gases enter and exit the leaf through the stomata. 3 3

22. LEAVES
Most food production takes place in mesophyll cells. Gas exchange occurs in the air spaces between the oddly shaped cells of the spongy mesophyll (5). 5

23. LEAVES
Veins (6) support the leaf and are filled with vessels that transport food, water, and minerals to the plant through branches. 6

24. LEAVES video clips Photosynthesis by Brainpop
Autumn Leaves by Brainpop
Leaves Video Clip-Discovery Channel

25. FLOWERS
Jobs of Flowers
reproductive system of seed plants

26. FLOWERS
PETALS
Parts of the flower include:
petals

27. FLOWERS
Parts of the flower include:
sepals
SEPALS

28. FLOWERS pistil (the female reproductive organs)
Parts of the flower include:
pistil (the female reproductive organs)

29. FLOWERS stamens (the male reproductive organs).
Parts of the flower include:
stamens (the male reproductive organs).

30. FLOWERS
Can you identify the male and female parts of this flower?

31. SEEDS
Flowers produce fruits, which grow seeds that can mature into new plants

32. SEEDS
GERMINATION = when a seed starts growing

33. Can you see the new baby plant at the bottom of the peanut?
SEEDS
Can you see the new baby plant at the bottom of the peanut?

34. *Anything that has SEEDS on the inside is a FRUIT!!!
FLOWERS
FRUITS come from FLOWERS!
*Anything that has SEEDS on the inside is a FRUIT!!!

35. FLOWERS
Flower Anatomy

36. FLOWERS video clips Pollination by Brainpop Plant Growth by Brainpop
Flower Parts by Discovery Channel

37. Miscellaneous video clips
Extreme Plant Adaptations—Discovery Channel

38. Sources