Describe with Labelled Diagram the Structure of Spirogyra - QS Study
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Vegetative body structure of spirogyra:

A) External features:

  1. The vegetative body of Spirogyra is unbranched and filamentous.
  2. Plant body is long, slender and multicellular.
  3. Numerous elongated and identical cells are arranged vertically in the filamentous body
  4. At the posterior end of the filament, there is a unicellular compressed part, called holdfast or hapteta by which the plant body remains attached with any substratum.

Cell wall:

  • Cell wall consists of three layers of which inner two layers are made of pectose and the outer layer is composed of cellulose
  • Filament is usually surrounded by a membrane made of mucilage

 

B) Protoplasm: Following parts are present in protoplasm:

Plasma membrane: It is situated just beneath the cell wall. It covers the inner matters of the protoplasm.

Cvtoplasm: It is situated inside the cell wall, very close to plasma membrane.

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C) Cell vacuole: Each cell has a large vacuole placed at the centre.

D) Nucleus: Each all contains a single nucleus. It remains suspended within the cytoplasm with the help of some cytoplasm strains.

E) Chloroplast: Chloropla.sts of this all are long and flattened as tape. They are arranged spirally around the saci.ole Number of chloroplasts present in each cell depends on the bests of its species. Usually the number of chloroplasts may vary from one to seven.

F) Pyrenoids:

i) Some silvery granules present in each chloroplast are called pyrenoids

ii) A plenty of protein piles up in the pyrenoids

iii) Starch is deposited as resent food around the pyrtnoids