External Fertilization:

External fertilization is the process of fertilization that occurs outside the body of organisms. It occurs in aquatic organisms such as fish, amphibians, and some invertebrates. In external fertilization, the eggs are released by the female into the environment, and the male releases his sperm into the water, where they fertilize the eggs.

Greater Synchrony between sexes:

External fertilization requires great synchrony between sexes. Both the male and female need to release their gametes (sperm and eggs) at the same time and in the same place for fertilization to occur. This synchrony is essential for the successful reproduction of external fertilizers.

More Variations:

Internal fertilization leads to lesser variations as the gametes are protected from external factors. External fertilization, on the other hand, leads to more variations in offspring as the gametes are exposed to the external environment. The offspring have to survive in a highly variable environment, and only a few may survive to adulthood.

Less Vulnerability to Predation:

External fertilization also leads to increased vulnerability to predation. The unprotected gametes can be easily consumed by predators, reducing the chances of successful fertilization. External fertilizers have developed various strategies to minimize predation, such as releasing large numbers of gametes or producing toxic substances.

Conclusion:

In conclusion, external fertilization leads to more variations and increased vulnerability to predation, but also requires great synchrony between sexes.

External Fertilization and Synchrony between Sexes

External fertilization is a type of fertilization where the union of gametes (sperm and egg) occurs outside of the body of the female. This is in contrast to internal fertilization, where gamete union occurs within the body of the female. External fertilization is common in aquatic organisms such as fish, amphibians, and many types of invertebrates.

Organisms exhibiting external fertilization show a great synchrony between sexes. This means that males and females release their gametes at the same time and in the same location. This synchrony is necessary for fertilization to occur, as the sperm and egg must come into contact with each other.

There are several reasons why external fertilization leads to great synchrony between sexes:

- External fertilization requires that gametes be released into the environment, where they are subject to external factors such as currents and waves. This means that males and females need to release their gametes in a way that ensures they will come into contact with each other.
- In many cases, external fertilization occurs in large groups or aggregations of individuals. This further increases the chances of gametes coming into contact with each other.
- Finally, some organisms use chemical signals or pheromones to attract mates and coordinate gamete release.

Overall, the synchrony between sexes in organisms exhibiting external fertilization is a key factor in ensuring successful fertilization and the production of offspring.