1 / 7

Plant reproductive modes

Plant reproductive modes. Seed plants. Heterosporous (different types of spores) . Comparison of reproductive modes of plants:. Sporophyte dominant; gametophyte reduced and dependent. Reproduction less dependent on water.

alva
Download Presentation

Plant reproductive modes

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. Plant reproductive modes • Seed plants • Heterosporous (different types of spores) • Comparison of reproductive modes of plants: • Sporophyte dominant; gametophyte reduced and dependent • Reproduction less dependent on water • Sperm in pollen travels to egg through pollen tube, eliminating need for external water during fertilization • Evolution of seed, an embryo protected by extra layer of sporophyte tissue (seed coat) • Protects embryo from desiccation • Dormant part of life cycle; able to survive until favorable conditions appear • Enhances dispersal How are new organisms produced?

  2. Plant reproductive modes • Gymnosperms (e.g. Phylum Coniferophyta) • Ovule (structure holding egg) not completely enclosed in sporophyte tissue at time of fertilization • Comparison of reproductive modes of plants: • Sperm travels to egg in wind-blown pollen (no water) • Embryo enclosed in desiccation-resistant seed coat How are new organisms produced?

  3. Plant reproductive modes • Gymnosperms life cycle • Comparison of reproductive modes of plants: How are new organisms produced?

  4. Plant reproductive modes • Angiosperms (Phylum Anthophyta) • Ovule (structure holding egg) completely enclosed in sporophyte tissue at time of fertilization • Comparison of reproductive modes of plants: • Sperm travels to egg in pollen (no need for water) • Some pollen is wind dispersed • Some pollen is dispersed by insects, birds, mammals • 3 unique characteristics of angiosperms: • Flowers (organs holding reproductive structures) • Fruit (organs holding seed) • Doublefertilization (1 sperm + 2 polar nuclei produce endosperm) • Embryo enclosed in desiccation-resistant seed coat How are new organisms produced?

  5. Plant reproductive modes • Two classes of angiosperms: • Monocotyledonae (monocots such as grass, lily, orchid) • Comparison of reproductive modes of plants: • Dicotyledonae (dicots such as trees, roses, daisy) • Major characteristics of the two classes: Trait monocot dicot • Leaf venation parallel network • Seed 1 cotyledon 2 cotyledons • Flower parts 3’s 4’s, 5’s or many • Life cycle few annual most annual • Growth in girth none some (trees) • Vascular tissue scattered arranged in ring How are new organisms produced?

  6. Plant reproductive modes • Flower structure • Flower parts arranged in whorls (concentric rings) on swollen part of stem called receptacle • Comparison of reproductive modes of plants: • Calyx (sepals that protect flower in bud) • Corolla (petals used to attract pollinators) • Androecium (male structures) • Gynoecium (female structures) How are new organisms produced?

  7. Plant reproductive modes • Angiosperm life cycle • Comparison of reproductive modes of plants: How are new organisms produced?

More Related