Elephantiasis is caused by

Which group of animals have haemocoel?

$(i)$ To which division of Plantae do algae belong? Write one characteristic of the division. Give two examples.
$(ii)$ Name the group:
$(a)$ Which includes unicellular eukaryotic organisms.
$(b)$ In which the mode of nutrition is saprophytic.
$(c)$ In which seeds are not enclosed in fruit.
$(iii)$ Classify flowering plants on the basis of the number of cotyledons present in the seed.

The 'Origin of Species' was written by:

Enlist four main features of organisms placed in the kingdom Protista.

The cell wall of fungi is made up of chitin.
$(i)$ What is the chemical nature of chitin?
$(ii)$ What is the mode of nutrition in fungi?