Question

The phenomenon of endogamy is reported in
A) Fasciola
B) Earthworm
C) Marchantia
D) Rabbit

Answer 1

Hint: Endogamy means self fertilisation. It occurs in bisexual organisms, many flowering plants, protozoans, and in many in-vertebrates.

Complete Answer:
- Endogamy means self fertilisation. It occurs in bisexual organism. In endogamy, two types of gametes fertilise that are derived from the same parent. The male and female gametes are produced by the same individual. For example, Fasciola.

A) Fasciola is commonly known as liver fluke. They are hermaphrodites that can produce both eggs and sperms. The male and female reproductive organ opens at the same chamber in the body called the genital atrium. These organisms show endogamy.
B) Earthworms are hermaphrodites and have both sex organs in the same body. But they reproduce by mating. During intercourse both sets of sex organs are used by both the partners. The eggs of both the mates get fertilised at the same time. Thus endogamy does not take place in earthworms.
C) Marchantia is a gametophyte plant. It bears both male sex organ called the antheridia and female eggs called the archegonia. The antherozoids are male gametes that swim in water to fertilise with the egg of another marchantia plant. Thus it does not show endogamy.
D) Rabbit are not hermaphrodites. They reproduce by mating.

Thus the correct answer is (A). Fasciola shows endogamy.

Note: Endogamy is the process of self fertilisation. In this phenomenon the male and female gametes are produced in the same body. It is not necessary that all hermaphrodites undergo endogamy.