Question

Which of the followings are monoecious and dioecious organisms.

a. Earthworm

b. Chara

c. Marchantia

d. Cockroach

• A. Monoecious
• B. Dioecious
• C. Dioecious
• D. ​​​​​​​ Monoecious

Answer 1

Answer: (A), (B), (C), (D)

a. Earthworm:

Earthworm is a terrestrial invertebrate with a burrowing habit. It belongs to the Phylum Annelida. It is a hermaphrodite (monoecious) which means that both the male and female reproductive organs are present in the same organism. Since the testes mature earlier than ovaries (protandry), so self fertilisation does not occur.



Final answer:

Monoecious

b. Chara:

Chara is a freshwater algae. It is monoecious, i.e., it has both male and female reproductive organs in the same organism. The male sex organ is known as antheridium or globule and the female sex organ is known as oogonium or nucule. Chara reproduces by both vegetative methods and sexual methods.




Final answer:

Monoecious

c. Marchantia:

Marchantia is a liverwort with a thallus level of structural organisation. It is a dioecious plant, i.e., the male and female reproductive organs are present in separate plants. It has antheridiophores and archegoniophores on different plants.



Final answer:

Dioecious

d. Cockroach:

Cockroach is a reddish brown nocturnal omnivore and belongs to the phylum Arthropoda. It is dioecious with separate sexes in different individual organisms. Male sex organs are testes and female sex organs are ovaries.



Final answer:

Dioecious