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Earthworm is a hermoprodite,so why can’t it show self fertilisation?

 Earthworm is a hermoprodite,so why can’t it show self fertilisation?


1 Answers

Apoorva Arora IIT Roorkee
askIITians Faculty 181 Points
7 years ago
A common misconception about hermaphroditic reproduction is that organisms fertilize their own eggs with their own sperm. In fact, most species do not self-fertilize, and many are physically incapable of self-fertilization. (Bisexual plants are the exception, and some do self-fertilize.) For example, sponges fertilize externally, but they release eggs and sperm into the plankton at different times, so that gametes encounter, and are likely to be fertilized by, or to fertilize, gametes from other individuals. The reproductive organs of earthworms are positioned at different ends of their bodies, so that fertilization of the eggs is only possible when the worms are aligned in opposite directions. Some simultaneous hermaphrodites even have alternative reproductive methods. The larvae of digenetic trematodes, such as the liver fluke, are simultaneous hermaphrodites, and reproduce asexually, while the adults reproduce sexually.

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