1 / 19

PROTOZOA

Learn about protozoa, the simplest eukaryotic animals composed of one cell that accepts, processes, excludes, breathes, moves, reacts to stimuli, and reproduces. Explore their microscopic, heterotrophic nature and various cell structures like food vacuoles and contractile vacuoles that aid in movement. Understand how protozoa respond to stimuli, reproduce asexually or sexually, and adapt to survive in unfavorable conditions as cysts. Discover the ecological importance of protozoa in food chains, soil fertility, environmental bio-indicators, and disease transmission. Dive into different protozoa groups like flagellates, rhizopods, and infusoria, each with unique characteristics and roles in ecosystems.

parisj
Télécharger la présentation

PROTOZOA

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. PROTOZOA Výukový materiál OR 03 - 66 Tvůrce: Mgr. Alena Výborná Tvůrce anglické verze: Mgr. Miloslava Dorážková Projekt: S anglickým jazykem do dalších předmětů Registrační číslo: CZ.1.07/1.1.36/03.0005 Tento projekt je spolufinancován ESF a SR ČR

  2. PROTOZOA • The simplest animals (eukaryotic) • The body is made up by one cell • One cell: • Accepts • Processes • Excludes • Breathes • Moves • Reacts to the stimulus • Reproduces

  3. PROTOZOA • Microscopic • Heterotrophic • A cell includes: • Food vacuoles • Contractile (pulsating) vacuoles • The movement is made by: • Amoeba (pseudopods) • Flagella • Cilium • Undulating membrane

  4. PROTOZOA • They accept stimulus from their surroundings: • By whole surface of the body • By sense organs: • Cilium (touch) • Pigment spots (accept light) • Reproduction: • Asexual (division, budding) • Sexual (joining different nucleus)

  5. PROTOZOA • Some of them create shells of silicon dioxide • Some of them cover their bodies by shells made of small sand grains • CYST • A rest, immobile, resistant stadium • Its function is to survive in unfavourable conditions

  6. PROTOZOA • The importance of protozoa: • Autotrophic protozoa belong to the basic parts of a food chain • Soil protozoa are important for soil fertility • A bio-indicator of the environment • They cause serious diseases

  7. PROTOZOA • GROUPS: • FLAGELLATE • RHIZOPODA • INFUSORIA

  8. PROTOZOA – FLAGELLATA • One or more flagella • The most original • Coreopsis: • Mixotrophic (autotrophic and heterotrophic) • A spot reacting to light • One or two flagella • Pools, puddles, polluted water

  9. Euglena • A stigma • Chloroplasts • A nucleus • A flagellum

  10. PROTOZOA – FLAGELLATA • Trypanosoma gambiense: • It lives in blood of a man and some mammals • It causes a sleeping sickness • A death disease, spread in tropic Africa • It is transmitted by a tsetse fly

  11. Trypanosoma gambiense

  12. Trypanosoma gambiense

  13. PROTOZOA - RHIZOPODA • A changeable body shape • They accept food thanks to pseudopods • Amoeba proteus • poodles, bottoms of pools • Entamoeba histolytica • a parasitical, gastric disease

  14. Amoeba proteus – a cell structure • A food vacuole • A contractile vacuole • A nucleus • Cytoplasm • A pseudopod

  15. PROTOZOA - INFUSORIA • The most perfect protozoa • The most complicated structure • They move thanks to flagella • The accept food by a cell mouth • They eat bacteria, algae… • The are food for many animals

  16. PROTOZOA - INFUSORIA • Paramecium caudatum • Polluted waters • An indicator of pollution • Vorticella • They appear in dense cover of water plants • Stylonychia mytilus • In water plants

  17. PROTOZOA – INFUSORIA, COREOPSIS • A stigma • Chloroplasts • A nucleus • A flagellum • Paramecium caudatum • Coreopsis • Stylonychia mytilus

  18. Revision: • 1) Name at least three organelles of movement: • 2) Which infusorian lives in polluted waters? • 3) A rest, immobile, resistant stadium is called: • 4) What causes a sleeping sickness ? • 5) What vacuoles does a cell of infusoriainclude?

  19. Source: • DOBRORUKA, Luděk J. Přírodopis pro 7. ročník základní školy. 1. vyd. Praha: Scientia, 1998, 152 s. ISBN 80-718-3134-4

More Related