Describe the structure of spirogyra and oedogonium?

Answer 1

(1)Spirogyrs occurs in freshwater bodies such as ditches,ponds,lakes etc.It is commonly called water silk or pond scum because of slippery touch touch of its thread like filaments.

(2)It is multicellular filamentous green alga covered by a mucilagenous sheath.

(3)Each filament is unbranched and consists of cylindrical cells placed end to end.

(4)The cell wall is two layered and is made up of cellulose and pectin.

(5)Cytoplasm lies in the periphery of cell enclosing a vacuole in the centre.

(6)One or more ribbon shaped spirally arranged chloroplasts are present in the cytoplasm.Each chloroplast bears pyrenoids.

(7)single nucleus is stranded in the centre of the vacoule by cytoplasmic strands.

Answer 2

Oedogonium

Oedogonium (right) is the most advanced of the filamentous Chlorophyceae. Its cell division is unique with cellulose rings at the anterior end of vegetative cells. These rings are remnants of broken parietal cell walls.

They reproduce sexually and asexually through a process of fragmentation. Asexual vegetative cells are able to generate zoospores from the protoplasm while motile reproductive cells produce gametes and reproduce in the typical sexual manner.

Oedogonium are found in freshwater and arranged in filaments. In the specimen to the right, notice the motile reproductive cell in the center and its surrounding vegetative cells.

Spirogyra

Spirogyra (right), commonly known as ubiquitous pond scum, is a unicellular freshwater algae that occurs in large free floating submerged mats, ponds, ditches, and slow moving streams. It has internally a helical structure (seen to the right) which are actually spiral bands of chloroplasts. Spirogyra do not produce swimming gametes. However, during reproduction, filaments form from the opposite mating organisms (+ or -) as they lie adjacent to one another. The connection is called a conjugation pilus. Nuclei may take as many as 30 days to fuse. The pilus many be seen in the reproductive progression below.

:reproduction. By tracing the darker green matter, the transfer of genetic information can be seen in a progression from right to left. One organisms becomes an empty shell. Immediate division in the third row to the right keeps the cell haplod instead of doploid. Now, sexual reproduction is complete.

Answer 3

Spirogyra is a filamentous freshwater green algae. It has cylindrically shaped cells with spiral-shaped bands of chloroplasts. This algae forms green scum on ponds.

Answer 4

there are a lot of things in a plant cell ( know as a tissue, a bunch of cells working together) cell wall cell surface membrane chloroplasts cytoplasm nucleus vacole.

Answer 5

Spirogyra consist of long roust of cylinder cells join end to end

Answer 6

i guess its rectangular if we view it

Answer 7

it is ribbon shaped

Answer 8

spiral chloroplast