A plant shows thallus level of organization. It shows rhizoids and is haploid. It needs water to complete its life cycle because the male gametes are motile. Identify the group to which it belongs to

Solution: Byrophyta is a groupp of plants which have gametophytic thalloid body. The motile male gamete are produced in special male reproductive structrue called antheridia .
These gametes need thin film of water to move and reach to the female reproductive organ called archegonia. Wrhereas pteriodophytes, gymnosperm and monocots show division of labour and theire body shows higher level of organisation.