PLANTS: FORM AND FUNCTION
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1 PLANTS: FORM AND FUNCTION
2 Tree of Life: focus on eukaryotes (cells with nucleus): plant & animal kingdoms
3 Plant Evolution Green marine algae Land plants H2O loss Adaptations to land Waxy cuticle: keeps water in
4 Adaptations to land Gravity: at first, low near ground Moss: Ireland: heating/cooking
5 Adaptations to land Later: standing tall : evolved vascular system Tubes: carry water & nutrients Similar: human blood vessels
6 First plants: seedless Later: seeds evolved WHY ARE SEEDS IMPORTANT? Plants can t walk around Seeds: dispersal of plants: spread babies around Different environments: better chance- survival
7 What is a seed?
8 What is a seed? Baby plant: embryo (combination of egg + sperm) Has own food supply: carbohydrates, fat, protein Tough outer coat First seed plants: evolved pine & fir trees (cone plants)
9 Example: seeds inside pine cone
10 Do plants have sex? Sort of: 1. Sperm inside pollen grain (pine pollen) wind 2. Fertilizes egg: inside female pine cone (miles away) 3. Seed (embryo): sprouts new tree
11
12 Plant sex: help from animals Sperm inside pollen grain on plant surface Plant attracts animals: A) Nectar (sugary water) B) Fragrance (smell) C) Bright colors (flower)
13 Animal picks up pollen egg another plant fertilization embryo inside seed Baby plant germinates Big plant
14 Fruits: fleshy coating around seeds
15 Seeds wrapped in burrs: dispersal
16 Finally: during time of dinosaurs Flowering plants evolved Dominant plant today: corn, rice, (food crops), roses, tulips, most trees
17 Why are plants so important to us? 1. Everything we eat directly: wheat, rice, corn, soybean or indirectly: all animals that eat plants
18 GRAINS Cereals, breads, crackers, rice, pasta, snacks Grains come from seed plants: wheat, oats, corn, barley, rice
19 All grains start out whole: all parts together, not broken up
20 Whole vs. Refined Grains Whole grains: natural, rich in vitamins, minerals, fiber Refined grains: broken apart (milled), processed (bleached, degerminated) by food companies
21 Refined Grains Why processed? Softer Whiter Shorter cooking time (white vs. brown rice) Longer shelf life
22 Refined grains: loss of nutrients & fiber Some nutrients, fiber (not all) added back = enriched, fortified Some products: mixture whole + refined grains
23 Refined Grains: Foods Corn bread Corn/flour tortillas Couscous Crackers, pretzels Grits Noodles, pasta Cornflakes White bread, buns, rolls White Rice
24 Whole grains: better for you Whole grains Risk: 1) heart disease/stroke 2) diabetes 3) help prevent weight gain
25 Whole Grains More nutrients + fiber Fewer calories Low in fat Rich- antioxidants
26 Whole Grains: How to find them Look at ingredients First key words: whole grain, 100% whole grain Multigrain, seven grain, twelve grain = Whole grain
27 Why are plants so important to us? 2. O2 from photosynthesis 3. Trap greenhouse gas : CO2 (global warming) One maple tree during the summer absorbs: 1000 pounds of CO2
28 Why are plants so important to us? 4. Medicines: atropine for heart attack patients
29 PLANT MEDICINES Atropine: Pupil dilator- eye exams Digitalis: Heart medication Menthol: Cough medicines Morphine (opium poppy): Pain reliever Quinine: Malaria prevention Taxol (Pacific Yew): Ovarian, breast cancer drug Curare: Muscle relaxant during surgery Vinblastine: Leukemia drug
30 Why are plants so important to us? 4. Lumber: building 5. Beauty
31 6. Biofuels Corn Ethanol Problem: trade-off food vs. fuel
32 Possible solution: Exxon Mobil Developing: algae powered cars
33 Algae absorb CO2 Greenhouse gas (global warming) Use energy in algae as biofuel Doesn t compete with corn or sugar cane as food source
34 Algae Farms: Biological Recycling
35 American Indian Reservation in Colorado: 300 days sun/year Algae (love CO2) tanks built near natural gas processing plant
36 Sun Gas CO2 Processing vents + algae Plant Heat BIOFUEL
37 Plant Structures: Focus on Angiosperms Flowering plants Seeds enclosed inside fruit
38 Roots Functions: 1. Grow to water and minerals 2. Absorption pass materials up to plant 3. Anchor plant in soil 4. Some roots: food storage (sweet potatoes, carrots)
39 Root Types A) Taproot: 1 large root + smaller roots Ex. Dandelion
40 Root hairs: surface area- absorption
41 B) Fibrous roots: many small roots- all same size Ex. Marigold
42 Why are roots so important? Plants: continuously lose water from leaves Transpiration: evaporation (like perspiration): moving the line Tall maple: loses 60 gallons H2O in 1 hour during summer Roots: replace H2O
43 Leaves: where food is made Photosynthesis
44 Photosynthesis Sunlight + CO2 + H2O O2 + Sugar Starch
45 Leaves: Stomata- pores Open (day), close (night) Gases: CO2, H2O, O2 move in and out
46 Leaf: Blade + Petiole (stem) Cuticle: waxy H2O loss
47 Stems: structure + storage (food) Shuttling up and down stem: Minerals and water Shuttling down: Food from leaves (photosynthesis) rest of plant How does this happen?
48 Vascular bundles: like your circulatory system
49 Vascular Bundles Xylem Carries H2O & Phloem Carries Food (sugar) minerals
50
51
52 Leaves Transpiration: loss of H2O by evaporation: suction from top pulls H2O up Tree Trunk 300 feet Xylem: continuous H2O column Roots
53 Redwood Tree Leaves Football field Roots
54 Sugar produced in leaves by photosynthesis Fruits Stems Roots Sugar moves through phloem
55 Flower: where plant sex happens
56 Plants coordinate: annual flowering with day length (spring/summer): make proteins flowering
57 Single flower: both boy & girl Male & female reproductive structures
58 Some plants: self fertilize Example: pea plants BORING: not Much variety (mixing- genes)
59 Better for evolution: sexual reproduction with other plants Sperm (one plant) Egg (another plants) Mixing genes : better- natural selection Better: adaptation: changing environments
60 Flower Parts Male Stamen: anther- pollen grains (sperm)
61 Female Carpel: ovary- contains egg: fertilization and baby plant embryo develop
62 Angiosperms: Asexual Reproduction Sperm egg new embryo Instead: cuttings from original plant grow new plant New plant: exact genetic replica of original (clone) Ex. Cuttings- orange tree in Brazil (1800 s) today s navel orange trees
63 Plant Hormones Similar- plants and animals Chemical messengers: released one place carries out activity another place
64 Plant hormones: What they do 1. Help roots and stems grow (cell division)
65 2. Help leaves fall off (autumn)
66 3. Help fruits grow
67 4. Ripen fruit
68 5. Help baby seeds sprout (germination)
69 Plant Growth Occurs at tips of roots and shoots Special areas: Apical Meristems Growing points Active Mitosis
70 Growth Primary Secondary
71 Primary growth: at tips of roots and shoots Plant grows longer Example: herbaceous plants (never make wood) Example: orchids/strawberries
72 Secondary Growth: thickening Example woody plants (trees & shrubs) Cork cambium (type of meristematic tissue): like cell factory pushing cells outward BARK
73
74 Plants: no nervous system but still respond to environment Response to gravity Seed in ground: shoots roots Sense gravity
75 Response to light Response to light: phototropism Tropism: a turning response to a stimulus Important: photosynthesis Hormone molecules shift in response to sunlight position Result: differential growth
76
77 Response to touch: one plant wraps around stick or another plant
78 Response to changing seasons
79 Photoperiodism: plant responding to change in amount of daily darkness vs. light In autumn: darkness longer Less chance: photosynthesis, less H2O in ground (frozen) So what does the plant do?
80 Plant Dormancy Growth Metabolism Uses stored food over winter
81 Abscission layer: disconnects leaf stem from branch
82 Chlorophyll starts to break down Now see hidden pigments: yellow, orange, blue, red Deciduous trees: leaves fall off
83 Flowering plants: 2 ways to classify them 1. How long they live 2. Their anatomy
84 How long they live (lifespan) Seed (baby plant) germinates (sprouts) Grow to adult plant New seeds Flower (reproduction) Death
85 Lifespan 1 year cycle: annuals Examples: tomatoes, wheat, corn, rice 2 years: biennials: carrots, cabbage Many years: perennials- trees, roses, shrubs, grass
86 Anatomy (structures) Monocotyledons Dicotyledons Monocots : 1 Dicots : 2 Cotyledon: baby (embryonic) leaf inside seed
87 Corn: a monocot Geranium: a dicot
88 Monocots vs. Dicots: other differences Leaves & roots
89 Monocots vs. Dicots: other differences
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