Life cycle of Chlorella, Classification of Chlorella , reproduction in chlorella

Chlorella

Sub- division                Algae

Class                           Chlorophyceae

Order                          Chlorococcales

Family                         Chlorellaceae

Genus                          Chlorella

Practical work and study

Classification of Chlorella , reproduction in chlorella

A Single cell representing a thallus.

Place a few cells on a slide, stain with safranin, wash in water and mount in glycerine. Study the cell structure.

1.Single cell represents the thallus. The cell is

non-motile.

2. The cell mostly occur singly or sometimes in groups.

3. A cell is very small. It is spherical to ellipsoidal in shape.

4. A cell has a single cup-shaped or curved band of chloroplast, parietal in position.

5. A single pyrenoid is generally found (lacking at times).

6. Nucleus lies surrounded by the cytoplasm which fills up most of the cell.

7. The only method of reproduction is by autospores. Two to sixteen autospores are formed by the cell as a result of division.

Life cycle of chlorella

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Identification

Sub-division—Algae.
(1) Simple thallus.
(2) Presence of chlorophyll.
(3) Cell wall of cellulose.

Class—Chiorophyceae.
(1) Chloroplasts grass-green, 
(2) Photosynthetic reserve—starch.

Order—Chliorococcales,
(1) Cells single and non-motile, 
(2) Uninucleate cells,
(3) Method of reproduction—zoospores or autospore formation.

Family—Chlorellaceae.
(1) Cell single, if united do not form a definite colony,
(2) Reproduction by autospores.

Genus—Chlorella,
(1) Cells solitary and spherical with smooth walls,
(2) Single chloroplast.

Hints for collection

It is found free living in quite and running waters. It also grows within the cells or tissues of invertebrates. C. Parasitica (Zoochlorella) is found in Ophrypodium spongilla etc. C. conductrix is known to occur in Hydra, Paramecium and Stentor.

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