Plant Evolution “If you are not a microbe and not animal, then you are most likely a plant” -Biology4kids.com.

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Presentation transcript:

Plant Evolution “If you are not a microbe and not animal, then you are most likely a plant” -Biology4kids.com

Actual Plant Evolution Closest Common Ancestor to Plants: Multicellular Algae Protist Evolution: -Heterotrophic (Amoeba) -Unicellular and Autotrophic (Euglena/Diatoms) -Multicellular and Autotrophic (Typical Algae) So if Algae can be multicellular, what makes it a plant? Apical Meristem promotes growth Multicellular Embryo Alternation of Generations

Evolution of a Multicellular Embryo

Protists--Very Diverse!

Evolution of Eukaryotic Cells Endosymbiosis Evidence: DNA Reproduce by Binary Fission Size Double Membranes

Endosymbiosis

What do Charophycean algae and plants have in common? Homologous chloroplasts (they are green!) Cellulose Cell Walls Peroxisomes Homologous Sperm Molecular similarities (DNA)

Evolution of Main Groups of Plants

On your own Review: Alternation of Generations Reproductive Tissues

Plant Organization Organs Tissues Cells

Let’s look at some of the plant basics… In plants, there are three major types of organs: Leaves Roots Shoots Note details in diagram about roots and shoots

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Modified Leaves

good things come in threes In plants, there are three types of tissues: Dermal Cuticle--adaptation Vascular Xylem & Phloem Ground Key Functions

In plants, there are three types of cells Parenchyma - think “parent” (along with metabolic functions) Collenchyma - weak walls, growth Sclerenchyma -thick walls, support, DEAD

Details of a Leaf Look at the leaf as an organ and identify tissue and cell types.

Unity and Diversity: Angiosperms

Observations and Analysis in Lab notebooks Introduction—What is the role of the leaf and how is it organized to perform the function of photosynthesis. Observations and Analysis-- Wet mount of stomata. Label guard cells and identify purpose of stomatat. Prepared leaf slide. Label and provide purpose of each tissue type. Label: Epidermis (collenchyma), cuticle, mesophyll, palisade parencyhma, spongy parenchyma, vascular bundle (schlerenchyma) Monocot and Dicot stem Compare and contrast the vascular tissue and be able to recognize the difference. Then make a chart in your lab notebook showing the 5 major differences between monocots and dicots. Conclusion: Describe how the organization of a leaf allows for the emergence of the funciton of photosynthesis.

Additional Resources on Plant Diversity Book: Chapter 35-38; Chapter 28-30 Private Life of Plants: Putting Down Roots ???When??? Friday: Photosynthesis: Chapter 10