plant life cycles chapter 30 animals vs. plants plant reproduction animal reproduction life cycle...

Download Plant Life Cycles CHAPTER 30 Animals vs. Plants Plant Reproduction Animal Reproduction Life cycle Alternation of generations No alternation of generations

Post on 22-Dec-2015

214 views

Category:

Documents

2 download

Embed Size (px)

TRANSCRIPT

  • Slide 1
  • Slide 2
  • Plant Life Cycles CHAPTER 30
  • Slide 3
  • Animals vs. Plants Plant Reproduction Animal Reproduction Life cycle Alternation of generations No alternation of generations GametesHaploid gametes SporesHaploid sporesNo spores Gametes made by Haploid gametophyte, by mitosis Diploid organism, by meiosis Spores made by Diploid sporophyte, by meiosis No spores
  • Slide 4
  • Alternation of Generations Plants have a double life cycle with two distinct forms: Sporophyte: diploid, produce haploid spores by meiosis. Gametophyte: haploid, produce gametes by mitosis.
  • Slide 5
  • Non-flowering plants Mosses, ferns, and related plants have motile, swimming sperm. What kind of environmental conditions would be required for reproduction in these plants? What kinds of limits does external reproduction impose on these plants?
  • Slide 6
  • Life cycle of mosses Follow the link and write down in your notes 1 page on the life cycle of mosses http://www.microview.org.uk/millennium/pag es/moss_lifecycle.htm http://www.sumanasinc.com/webco ntent/animations/content/moss.html
  • Slide 7
  • Moss Life Cycle
  • Slide 8
  • Life cycle of ferns Ferns, unlike some other plants, do not flower in order to propagate. Instead, they reproduce sexually from spores. The life cycle of a fern is very different from the life cycle of many other plants. While many plants grow a mature adult form straight out of the seed, ferns have an intermediate stage, called a gametophyte, which then grows into a mature fern. There are two distinct stages in the life cycle of ferns. The first stage is that of the gametophyte. Spores are produced on the underside of mature plants. These will germinate and grow into small, heart-shaped plants called gametophytes. The gametophytes produce both sperm and egg cells, and will fertilize itself, or others. Once the fertilization occurs, the adult fern will begin growing. The second stage in the life cycle of a fern is the adult stage. The fertilized gametophytes begin to look like a mossy growth.
  • Slide 9
  • Slide 10
  • Conifers Conifers (also non-flowering plants) have reduced gametophytes. Male gametophyte is contained in a dry pollen grain. Female gametophyte is a few cells inside of the structures that become the seed.
  • Slide 11
  • Conifer life cycle
  • Slide 12
  • Conifer pollination Conifers are wind-pollinated plants. Chance allows some pollen to land on the scales of female cones. Pollen germinates, grows a pollen tube into the egg to allow sperm to fertilize the egg. What are some advantages and disadvantages to wind pollination?
  • Slide 13
  • Flowering Plant Reproduction
  • Slide 14
  • Angiosperms (flowering plants) Plants that protect their seeds within the body of a fruit. Make up s of all plants, including: Trees, shrubs, herbs, grasses, water plants
  • Slide 15
  • Structure of a Flower 1. Pistil 2. Stigma 3. Style 4. Ovary 5. Stamen 6. Filament 7. Anther 8. Petal 9. Sepal 10. Receptacle 11. Stem
  • Slide 16
  • Male Reproductive Structure The stamen consists of two parts: Anther and Filament The anther is where meiosis occurs to produce haploid pollen The filament is a stalk that supports the anther
  • Slide 17
  • Female Reproductive Structure The pistil consists of the stigma, style and ovary The sticky stigma receives the pollen from the anther The pollen grows a tube down through the style Meiosis occurs in the ovary to produce haploid ovules
  • Slide 18
  • Reproductive Structures Petals: colourful structures that attract pollinators. Sepals: surround and protect the flower bud.
  • Slide 19
  • Pollination Wind, insects or other animals transfer pollen from the anther of one flower to the stigma of another Flowers vary depending on pollination mechanism
  • Slide 20
  • Pollination Animation
  • Slide 21
  • Pollination Vectors Wind Pollination: Dull, scentless flowers with reduced petals Bees/Butterfly Pollination: Bright color, nectaries, scent. They sip nectar, get pollen on coats, transfer pollen from flower to flower Bird Pollination: Nectaries, bright colors, tube-like flowers Moth Pollination: White petals, open at night Fly Pollination:Rank odor, flesh colored petals
  • Slide 22
  • Pollen GrainAnther Sac Pollen grains contain two haploid cells produced through meiosis. 1- The Tube cell will grow the pollen tube. 2- The Generative cell will go through mitosis to create two sperm cells.
  • Slide 23
  • Ovary Each ovule within an ovary has a micropyle (an opening for the pollen tube). The ovules megasporangium undergo meiosis to produce four haploid cells (3 die leaving 1 megaspore) The megaspore undergoes mitosis 3 times to produce 8 haploid cells within the embryo sac.
  • Slide 24
  • Slide 25
  • Fertilization {After pollen lands on the stigma, a pollen tube grows down through the style to ovary {Generative cell creates the two sperm nuclei {Double fertilization occurs: {one sperm fertilizes the egg { one sperm the two polar nuclei together
  • Slide 26
  • Result of Double FertilizationDouble Fertilization {The sperm nucleus and egg nucleus join to form a 2n (diploid) embryo {The other sperm nucleus and the two polar nuclei join to form a 3n (triploid) endosperm. The endosperm is the food supply for the embryo. {First linkFirst link
  • Slide 27
  • Seed and Fruit Development {After fertilization, the petals and sepals fall off flower {Ovary ripens into a fruit {The ovule develops into a seed
  • Slide 28
  • Seed Dispersal Mechanisms- Allow plants to colonize new areas and avoid shade of parent plant Wind Dispersal - Flight mechanisms, like parachutes, wings, etc. Ex. Dandelion, maples, birch Animal Dispersal - Fleshy fruits which animals eat, drop undigested seeds in feces or burrs which stick to animals coats
  • Slide 29
  • Gravity Dispersal - Heavy nuts fall to ground and roll ex. acorns Water Dispersal - Plants near water create floating fruits ex. coconuts
  • Slide 30
  • Plant Responses CHAPTER 31 How plants move and communicate
  • Slide 31
  • Plant Hormones
  • Slide 32
  • Plant hormones can be divided into two classes: Growth promoters: Auxins, Gibberellins, Cytokinins Growth inhibitors: Ethylene gas, Abscisic acid
  • Slide 33
  • Growth promoters Hormones can promote plant growth in two ways: Stimulating cell division in meristems to produce new cells. Stimulating elongation in cells.
  • Slide 34
  • Auxins
  • Slide 35
  • Auxin activity Auxins stimulate genes in cells associated with plant growth.
  • Slide 36
  • Auxin roles Auxins carry out multiple roles having to do with plant growth including: Tropisms Apical dominance Growth of adventitious roots Fruit growth
  • Slide 37
  • Tropisms Tropisms are the growth of a plant toward or away from a stimulus, including: Phototropism: in response to light Gravitropism: in response to gravity Thigmotropism: in response to touch
  • Slide 38
  • Nastic Movements
  • Slide 39
  • Nastic movement in the sensitive plant (Mimosa pudica)
  • Slide 40
  • Hinge control in Venus Fly Trap - Nastic movement
  • Slide 41
  • How it works Nastic movements are rapid, reversible movements in a plant. Electrical potentials across cell membranes, similar to those in our nerve cells, signal plant cells at the base of the Mimosa leaf to rapidly lose water. This causes the leaf to droop.
  • Slide 42
  • Movies Sensitive Plant: http://www.youtube.com/watch?v=BVU1 YuDjwd8 http://www.youtube.com/watch?v=BVU1 YuDjwd8 Venus Fly Trap: http://www.youtube.com/watch?v=ktIGV tKdgwo&feature=related http://www.youtube.com/watch?v=ktIGV tKdgwo&feature=related
  • Slide 43
  • Other examples Sunflowers follow the sun during the day. Leaves of many plants turn to follow the sun.
  • Slide 44
  • Day/Night length Some plants flower in response to the length of periods of darkness. Spring-blooming flowers are long night (short day) plants, while summer- blooming flowers are short night (long day) plants. Some plants are day-neutral.
  • Slide 45
  • Slide 46
  • Plant Communication Plants communicate chemically. Injured plants send out chemical signals that may signal other plants to prepare for an attack. attract other insects that eat the insects that are attacking the plant.
  • Slide 47

Recommended

View more >