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7 th Grade Science. LEARNING OBJECTIVES  Understand the basic structure and function (job) of the tissues, organs, and organ systems of plants  Consider.

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Presentation on theme: "7 th Grade Science. LEARNING OBJECTIVES  Understand the basic structure and function (job) of the tissues, organs, and organ systems of plants  Consider."— Presentation transcript:

1 7 th 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 Are the “circulatory system” of the plant Both are TUBES used for transport

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

9 Xylem Tissue Phloem Tissue

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

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

13 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)

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

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

18  Chlorophyll is the molecule in green parts of plants that uses the energy in sunlight to turn water (H 2 O) and carbon dioxide gas (CO 2 ) into sugar (glucose— C 6 H 12 O 6 ) and oxygen gas (O 2 ). This process is called photosynthesis.

19  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  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 Label your diagram as we go! (Add the numbers and arrows!)

21  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

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

24  Photosynthesis by Brainpop Photosynthesis by Brainpop  Autumn Leaves by Brainpop Autumn Leaves by Brainpop  Leaves Video Clip-Discovery Channel Leaves Video Clip-Discovery Channel

25 Jobs of Flowers  reproductive system of seed plants

26 Parts of the flower include: o petals PETALS

27 Parts of the flower include:  sepals SEPALS

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

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

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

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

32 GERMINATION = when a seed starts growing

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

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

35  Flower Anatomy

36  Pollination by BrainpopPollination  Plant Growth by BrainpopPlant Growth  Flower Parts by Discovery Channel Flower Parts by Discovery Channel

37  Extreme Plant Adaptations—Discovery ChannelExtreme Plant Adaptations—Discovery Channel

38 Sources


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