Which of the following are monoecious and dioecious organisms ?
(a) Earthworm........... , (b) Chara ...........
(c) Marchantia ................ , (d) Cockroach .............

Explanation

(a) Earthworm - Monoecious animal , (b) Chara - Monoecious plant
(c) Marchantia - Dioecious plant , (d) Cockroach - Dioecious animals
Note In several fungi and plants, terms such as homothallic and monoecious are used to denote the bisexual condition (male and female reproductive structures in the same plant) and heterothallic and dioecious are the terms used to describe unisexual condition (male and female reproductive structures on different plants). But in animals, individuals are either male or female (unisexual) or possess both the reproductive organs (bisexual).