OEDOGONIUM

Question 1

Form and colour?

Answer 1

Filamentous and grees

Question 2

Type of chlorplasts?

Answer 2

Netlike and large

Question 3

Reproduction?

Answer 3

Both asexual and sexual

Question 4

Reproduction, Asexual?

Answer 4

1. Either by zoospores or fragmentation (as seen in spirogyra)
2. ZS are produced in cells at the tip of the filaments and these have about 120 flagella
3. after escaping the leave the cell and shed their flagella then divide via mitosis and form new filaments

Question 5

Reproduction, Sexual?

Answer 5

1. Antheridia are formed and these are short and box like and represent the male sex organ
2. Sperm looks like ZS but are smaller
3. Oogonia are formed and these are swollen and round and are the female sex organ
4. Egg grows, pore develops on side of oogonium, sperm that has escaped the antheridia is attracted
5. One sperm enters the oogonium and unites with the egg = zygote
6. Cell wall thickens, dormancy, good conditions, meiosis = 4 haploid ZS = new filament each
7. This is oogamy = large and non-motile egg + small and motile sperm