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Presentation on theme: "Plants."— Presentation transcript:

1 Plants

2 Characteristics Multicellular Eukaryotic Cell Wall = Cellulose
Cuticle – waxy, waterproof Photosynthesis Evolved from green algae

3 Adaptations Cuticle – to prevent water loss
Leaf – plant organ that grows from a stem and usually is where photosynthesis occurs Roots – absorbs water and minerals from soil Stem – provides support for growth and transport of food, water, and materials

4 Reproduction Seeds – contain an embryo, seed coat, and food supply
Alternation of Generations Gametophyte – haploid Sporophyte – fertilized, diploid

5 Seed Plants Embryo – early stage of development of an organism
Include one or more cotyledons – store or absorb food for the developing embryo Seed Coat

6 Seed Plants Advantages of Seeds Contains a supply of food
Embryo protected by seed coat Easy dispersal

7 Plant Tissues Dermal Tissue (epidermis) – composed of flattened cells that cover all parts of the plant Functions like the skin of animals Tightly compacted like a jigsaw Stomata (stoma) – openings in the leaf tissue that control the exchange of gases Guard Cells – control the opening and closing of stomata


9 Xylem –transports water and dissolved minerals from the roots to the rest of the plant
Phloem – transport sugars and other organic compounds Meristems – regions of actively dividing cells

10 Plant Hormones Auxins – promotes cell elongation
Gibberellins – promote growth Cytokinins – stimulate cell division Ethylene – promotes ripening

11 Plant Responses VERY IMPORTANT!
Tropism – plants response to an external stimulus 1. Photo-tropism – grows toward the light 2. Gravitropism – grows in response to gravity 3. thigmotropism – grows in response to touch, Ivey up a wall Nastic Movement – venus fly trap

12 Two types of seed plants
1. Gymnosperms (conifers) – Cones Needle shaped leaves Scale like leaves Seeds in cones Evergreens (leaves year round) Cold or dry habitats Deciduous (lose their leaves)

13 Flowering Plants - Angiosperms
Produce flowers Seeds enclosed in fruits Monocot & Dicots

14 Flower Parts Structures for sexual reproduction
Stamen (male) – contains anther and filament, pollen is sperm

15 Pistil (female) – contains stigma, style and ovary

16 Structure of a Flower

17 A fertilized ovule is a seed
Seed contains embryo and stored food A mature ovary is a fruit Seed Dispersal Wind, rain, and animals Seed germination is growth of the embryo

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