introductiontoalgae.pptx

Algae definition
Classification of algae
Sexual reproduction of algae
Habit and habitat of algae
Anisogamy reproduction
Isogamous reproduction
Oogamous reproduction
Life cycle of chalmydosomnas

1. Algae

2. Algae Algae are the chlorophyllus thallophytes that can manufacture their own food and they produce oxygen during photosynthesis. So they are called as autotrophic thallophytes . The term thallus is used for plant body that is not differentiated into root, stem and leaves. Lacks vascular system. “The study of algae is known as phycology.”

3. Habit and habitat The algae re predominantly aquaticand are found both in fresh and salt-water habitats. According to the habitat the algae can be classifiedas : Aquatic algae Terrestrial Aerophytes Cryophytes Thermophytes

4. Algae Classification There is three main Algae classification : Chlorophyceae  – These are called green algae, due to the presence of pigments chlorophyll a and b. Examples are Chlamydomonas , Spirogyra, and Chara Phaeophyceae  – Also called as brown algae, they are predominantly marine. They have chlorophyll a, c, carotenoids and xanthophyll pigments. Examples are Dictyota , Laminaria , and Sargassum Rhodophyceae –  They are the  red  algae because of the presence of the red pigment, r- phycoerythrin . Examples are Porphyra , Gracilaria , and Gelidium .

5. Unicellular motile Chlamydomonas Occurance It is fresh water free swiming alga. It is frequenlty found in standing water, ponds, ditches, pools, rain water and in damp soil. Structure of Chlamydomonas : Chlamydomonas is unicellular, motile green algae. The thallus is represented by a single cell. The shape of thallus can be oval, spherical, oblong, ellipsoidal or pyriform . The pyriform or pear shaped thalli are common, they have narrow anterior end and a broad posterior end

6. The structure of thallus can be divided into following parts: Cell Wall Cytoplasm Flagella Neuro -motor Apparatus Chloroplast Stigma or Eyespot

7. Chlamydomonas reproduces both asexually and sexually A sexual   reproduction   occurs by zoospores, aplanospores , hypnospores , or a palmella stage S exual   reproduction  is through isogamy, anisogamy or oogamy

8. Asexual reproduction

9. Asexual reproduction

10. Sexual reproduction

11. Anisogaymous reproduction

12. Oogamous reproduction

13. Life cycle of chlymadomonas

14. Graphic life cycle

15. Economic Importance 1. Food: A number of green algae are used as food, e.g., Ulva , Caulerpa , Enteromorpha . Chlorella can yield food rich in lipids, proteins, vitamins and minerals. 2. Antibiotics: They can be extracted from Chlorella and Caulerpa . 3. Parasites: Cephaleuros virescens causes red rust of tea and reduces yield of tea. It also reduces the yield of coffee, pepper, citrus, etc. 4. Sewage Oxidation: Sewage oxidation ponds contain a number of green algae, e.g., Chlamydomonas , Chlorella, Scenedesmus .

16. https://www.toppr.com/guides/biology/plant-kingdom/algae/ https://www.biologydiscussion.com/algae/life-cycle-algae/chlamydomonas-position-occurrence-and-structure-with-diagrams/21052 https://www.google.com/search?q=structure+of+chlamydomonas&rlz=1C1CHBD_enPK817PK817&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjpw5zG0OvrAhWUiFwKHRfMB0EQ_AUoAXoECA4QAw&biw=1366&bih=657#imgrc=Q3MO_bgas2pH_M https:// www.biologydiscussion.com/algae/life-cycle-of-chlamydomonas-with-diagram/53699 https://www.biologydiscussion.com/algae/green-algae-characters-and-economic-importance-with-diagram/52153#:~:text=A%20number%20of%20green%20algae,%2C%20proteins%2C%20vitamins%20and%20minerals .