Question

Compare the differences in sexual reproduction between Porifera and Cubozoans. How does the difference in fertilization provide an evolutionary advantage to the Cubozoans?

(a) Porifera reproduce sexually by external fertilization, while Cubozoans reproduce sexually by internal fertilization.
(b) Porifera release their sperm and eggs into the water, where they fuse to form a zygote. Cubozoans transfer sperm from the male to the female, where fertilization occurs within the female's body.
(c) Porifera have no control over the fertilization of their eggs, while Cubozoans have direct control over the fertilization of their eggs.
(d) Cubozoans have a higher survival rate of their offspring than Porifera due to internal fertilization.

Answer 1

Porifera reproduce by external fertilization while Cubozoans reproduce by internal fertilization. Internal fertilization provides an evolutionary advantage to Cubozoans by protecting the fertilized egg and enhancing fertilization success.

Step-by-step explanation:

Porifera and Cubozoans have different methods of sexual reproduction. Porifera reproduce by external fertilization, where they release their sperm and eggs into the water, while Cubozoans reproduce by internal fertilization. In Cubozoans, the male transfers sperm to the female, where fertilization occurs within the female's body.

This difference in fertilization provides an evolutionary advantage to the Cubozoans. Internal fertilization protects the fertilized egg from dehydration on land and limits predation on the young, leading to a higher survival rate of their offspring. Additionally, internal fertilization enhances the fertilization of eggs by a specific male, ensuring reproductive success.