1 / 11

Gymnosperms and Angiosperms

Gymnosperms and Angiosperms. Two types of seed plants. Plants that produce seeds are called “seed plants” Pine trees and apple trees are both seed plants. Gymnosperms!. Definition: A seed plant that produces “naked seeds”

makaio
Télécharger la présentation

Gymnosperms and Angiosperms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Gymnosperms and Angiosperms Two types of seed plants

  2. Plants that produce seeds are called “seed plants” • Pine trees and apple trees are both seed plants

  3. Gymnosperms! Definition: A seed plant that produces “naked seeds” • They are called “naked” because they are not enclosed by a protective fruit • No fruit because no flowers! Characteristics: • Many have needle-like or scale-like leaves • Deep growing root system • Very ancient – been on earth about 360 million years

  4. 4 types of gymnosperms survive today • Cycads • Grow mainly in tropical and subtropical areas • Look like palm trees with cones • Conifers (means cone-bearing plant) • Largest group of gymnosperms • Most are evergreens

  5. 4 types of gymnosperms survive today • Ginkgoes • Many species alive millions of years ago • Only one survives today (Ginkgo biloba) 4) Gnetophytes • Live in hot deserts and tropical rain forests • Can be trees, shrubs, or vines

  6. Reproduction in Gymnosperms **Look at the picture on page 275 in your book** 4 Steps: • Pollination • Transfer of pollen (sperm) from male cone to female cone • Pollen carried by wind • Fertilization • Sperm cell fertilizes the egg cell • Fertilized egg develops into embryo part of the seed • Seed Development • Seed matures, can take up to 2 years! • Seed Dispersal • When seeds are mature the wind carries seeds away.

  7. Angiosperms! Definition: A seed plant that produces flowers, which turn into seeds that are enclosed in fruit

  8. The Structure of Flowers A flower is the reproductive structure of an angiosperm Reproductive Organs: • Pistil • Female part of the flower • Stigma = sticky tip • Style = connects stigma & ovary • Ovary = contains ovule • Stamen • Male part of the flower • Anther produces pollen • Filament holds up anther Pistil

  9. The Structure of Flowers The other parts can play a role in reproduction! Non-reproductive parts: • Sepals • Protect the developing flower • Often green in color • Petals • Shape, size, and number are different from flower to flower Pistil • Petals help with pollination! • Colors and shapes attract pollinators • Pollinators include birds, bats, and insects • Wind can also pollinate flowers

  10. Reproduction in Angiosperms **Look at the picture on page 279 in your book** 4 Steps: • Pollination • When a grain of pollen falls onto the sticky stigma • Fertilization • Sperm cell fertilizes the egg cell • Egg cell is inside an ovule which is in an ovary • Fruit Development • After fertilization, the ovary becomes a fruit • Seed Dispersal • Animals eat fruits that contain seeds and disperse the seeds

  11. Types of Angiosperms Two major groups of angiosperms: • Monocots • Examples: grass, corn, lilies, tulips • Dicots • Examples: roses, maple trees, beans, apples “Cot” is short for cotyledon • Cotyledon = seed leaf

More Related