객관식
Cephalopods are the only molluscs __________.
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31. Invertebrates
Lophotrochozoans
Multiple Choice
During typical earthworm reproduction, __________.
A
each individual fertilizes its own eggs with its own sperm (in self-fertilization)
B
fertilization takes place during copulation between males and females
C
hermaphroditic individuals exchange eggs
D
reproduction is by parthenogenesis, with no male participation
E
hermaphroditic individuals exchange sperm
검증된 단계별 안내1
Understand that earthworms are hermaphroditic, meaning each individual has both male and female reproductive organs.
Recognize that during reproduction, earthworms do not self-fertilize; instead, they engage in copulation with another earthworm.
During copulation, two earthworms align ventrally and exchange sperm with each other, which is stored in special sacs called spermathecae.
After the exchange of sperm, each earthworm will later use the received sperm to fertilize its own eggs internally.
This process ensures genetic diversity, as the eggs are fertilized by sperm from a different individual, not by self-fertilization or parthenogenesis.
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