Green algae are the algae most closely related to land plant

Green algae are the algae most closely related to land plants: they share starch as their storage product, they use the same pigments (chlorophylls a and b and others), and they both have cellulose in their cell walls. There are unicellular, colonial and multicellular forms. They reproduce in many different ways. Look at the prepared slide of, a unicellular green alga. You are probably looking at the diploid generation. Research this organism. Why do you think the haploid gametes are referred to as \"+\' and \"-\", and not male and female?

Solution

Chlamydomonas is a single celles Green Alga found in fresh water and soil.

Chlamydomonas exhibits Isogamous mode of sexual reproduction. This involves the gametes of similar morphology i.e. similar shape and size, and differing only in allele expression in one or more mating type regions. As both the alleles look alike therefore they cannot be differentiated as male of Female. Instead they are called a dufferent mating types commonly noted as + or -.