Answer



Back 		Structural evidence:
1. Fucus shows division of labour; there is cellular differentiation. There is no division of labour in the Spirogyra; all the cells are identical.
2. Fucus is diploid (2n), Spirogyra is haploid (n).

Reproduction evidence:
1. Fucus is heterogamous, Spirogyra is isogamous.
2. Sexual reproduction is the main type of reproduction in the fucus, asexual reproduction is the main type for Spirogyra.
3. The zygotes of Fucus germinate immediately by mitosis. The zygotes of Spirogyra becomes dormant zygospores germinating by meiosis when favourable growth conditions return.