Q.Draw a neat labelled diagram: Chlamydomonas.

Chlamydomonas is described in this chapter as a microscopic, motile, unicellular green alga (Chlorophyceae). To draw and label it:

Step 1. Overall shape and motility. Draw a single small oval or pear-shaped cell, with a pair of thin whip-like flagella projecting from its anterior (front) end — these are what make it motile, unlike the non-motile Chlorella.

Step 2. Outer layers. Label the outer boundary as the cell wall, with the cell membrane just inside it, enclosing the cytoplasm.

Step 3. Chloroplast and pyrenoid. Draw a single large, cup-shaped chloroplast occupying most of the cell's interior, and mark a rounded body within it as the pyrenoid, the site of starch storage. …

Draw a single motile cell with flagella, and label the cup-shaped chloroplast with pyrenoid, nucleus and mitochondria, distingu …

• Forgetting the flagella, which is what distinguishes motile Chlamydomonas from non-motile forms like Chlorella. …