Question

Draw a neat diagram of spirogyra and label on it- Jelly like substance in the cell where the organelles are suspended.

Answer 1

Hint: Spirogyra any genus member of some 400 free-floating green algae species of the Chlorophyta division found globally in freshwater environments Spirogyras are filamentous algae consisting of thin unbranched chains of cylindrical cells, named for their exquisite spiral chloroplasts.

Complete answer:
They can form masses that float near the surface of streams and ponds, buoyed by oxygen bubbles produced during photosynthesis.. They are widely used in laboratory demonstrations. Each filament cell has a large central vacuole, within which fine cytoplasm strands suspend the nucleus.

The chloroplasts form a spiral around the vacuole and have specialised bodies that store starch, known as pyrenoids.. The cell wall is formed by the inner layer of cellulose and the outer layer of pectin, which is responsible for the slippery texture of the algae.

Species of Spirogyra can reproduce sexually as well as asexually. Asexual, or vegetative, reproduction occurs by simple filament fragmentation. Sexual reproduction occurs by a mechanism known as conjugation, in which outgrowths called conjugation tubes are joined by cells of two filaments lying side by side.

This helps one cell's contents to fully move into and fuse with the other's contents. A dense wall covers and overwinters the resulting fused cell (zygote), while the vegetative filaments die.

Note: An unbranched filamentous thallus is the vegetative structure of Spirogyra.
With - cylindrical cells joining end to end, the thallus is multicellular.
They are 10-100 μm wide and can be several centimetres tall.
Owing to the presence of the mucilage sheath around the filament, they are present as a slimy mass