AP BIOLOGY

Detailed explanation-1: -In animals which undergo external fertilisation, development of embryo takes place outside the female body. For e.g., in frogs, both male and female release their gametes in water. The fusion of gametes to form zygote takes place in the water, outside the body of both the parents.

Detailed explanation-2: -What is External Fertilization? Fertilization that occurs outside the body of an organism is known as external fertilization. It usually requires a water body for successful fertilization. The sperms and eggs are released in an external environment.

Detailed explanation-3: -In vitro fertilization (IVF) is the joining of a woman’s egg and a man’s sperm in a laboratory dish. In vitro means outside the body.

Detailed explanation-4: -Key Points. External fertilization is characterized by the release of both sperm and eggs into an external environment; sperm will fertilize the egg outside of the organism, as seen in spawning.

Detailed explanation-5: -Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.