Presentation is loading. Please wait.

Presentation is loading. Please wait.


Similar presentations

Presentation on theme: "THE PLANT KINGDOM."— Presentation transcript:


2 All Plants Evolved from Common Ancestor: Ancient Green Algae
Cell walls made of cellulose Store excess carbohydrates as starch Form a cell plate during cytokinesis Have same photosynthetic pigments: Chlorophyll a and b Carotenoid – carotene and xanthophyll

3 Adaptations to life on land:
Cuticle Waxy layer on aerial portion that prevents dessication Thickness depends on how dry the environment is

4 Adaptations to life on land:
Cuticle Stomata: Pores on the surface of leaves and stems Allows for gas exchange

5 Adaptations to life on land:
Cuticle Stomata Gametangia Multicellular sex organs Covered by a layer of sterile cells – protection Embryo develops inside gametangia

6 Plant Life Cycle Alternation of generations Gametophyte
Multicellular haploid stage Produces gametes Sporophyte Multicellular diploid stage Produces spores

7 Gametophyte generation
Gives rise to haploid gametes by mitosis Sperm cells form in antheridia Egg cells form in archegonia Once sperm cell fertilizes an egg cell, a zygote is formed

8 Sporophyte generation
Begins with diploid zygote Zygote divides by mitosis and develops into embryo Grows into mature sporophyte plant Specialized cells called sporogenous cells divide by meiosis into haploid spores

9 Four Main Groups of Plants
Bryophytes Seedless vascular plants Gymnosperms Angiosperms

10 Bryophytes Nonvascular plants Rely on diffusion and osmosis
Restricted in size Generally require moist environment MOSSES, LIVERWORTS, HORNWORTS

11 Moss Life Cycle

12 Vascular Plants Ferns, Gymnosperms, Angiosperms
Contain xylem and phloem Cell walls contain lignin Strengthening polymer Support Conduction Allows plants to grow tall

13 Seedless Vascular Plants
Ferns & club mosses Most important adaptation: Xylem – transports water Phloem – transports food Transport allows plants to grow larger

14 Club Mosses Only group of vascular plants with microphyll True Roots
Leaf with single vascular strand True Roots Rhizome & aerial stems Reproductive leaves with sporangia

15 Ferns Rhizome w/ roots Fronds Sori found on fronds
Clusters of sporangia Sporagenous cells undergo meiosis  spores

16 Fern Life Cycle Prothallus

17 Homospory vs. Heterospory
Homospory – sporophyte produces 1 kind of spore Heterospory – microspores & megaspores

18 Dominant Stages Bryophyte – Gametophyte Seedless Vascular – Sporophyte
Gymnosperms – Sporophyte Angiosperms - Sporophyte

Download ppt "THE PLANT KINGDOM."

Similar presentations

Ads by Google