Why is it important that animals that have external fertalisation produce a lot of eggs?

External fertilization in an aquatic environment protects the eggs from drying out. ... Therefore, millions of eggs must be produced by individuals. The offspring produced through this method must mature rapidly. The survival rate of eggs produced through broadcast spawning is low.

1. Why is it necessary to produce large number of eggs and sperms by the animals?
2. How many eggs are produced in external fertilization?
3. Why internal fertilization is advantages to the animal when compared to external fertilization?
4. Why is external fertilization disadvantageous to animals than internal fertilization?
5. Why animals can reproduce in large number?
6. What is external fertilization explain with example?
7. Why are environmental cues important for external fertilization?
8. Why do animals with external fertilization almost always live in water?
9. What is external fertilization short answer?
10. Why is internal fertilization more efficient than external?
11. Why was internal fertilization necessary for reptiles birds and mammals?
12. What are 2 advantages of internal fertilization?
13. What is the advantage and disadvantage of external fertilization?
14. Why is the continuous reproduction of animals important to life on Earth?
15. What is external fertilization and its disadvantages?

Why is it necessary to produce large number of eggs and sperms by the animals?

The animals in which external fertilization takes place produces a large number of eggs sperms. This is because the eggs and sperms get exposed to water movement, wind, and rainfall. ... Thus, the production of a large number of eggs and sperms is necessary to ensure fertilization of at least a few of them.

How many eggs are produced in external fertilization?

Up to 130 species release gametes during this time. In some cases, fertilization can take place on a spawning animal's surface and when the animals are in the turbulent wake.

Why internal fertilization is advantages to the animal when compared to external fertilization?

Internal fertilization protects the fertilized egg or embryo from predation and harsh environments, which results in higher survival rates than can occur with external fertilization.

Why is external fertilization disadvantageous to animals than internal fertilization?

Disadvantage if external fertilisation is that there is less chances of meeting of sperm and ova whereas in internal fertilisation there is more chances if fertilisation. More no of sperms are delivered in external fertilisation as compared to internal fertilisation to increase efficiency of fertilisation.

Why animals can reproduce in large number?

In fact, all animals produce more offspring than can survive long enough to reproduce themselves. ... The number of offspring produced is often related to the amount of parental care. Typically, the higher fecundity, the lower the amount of time parents devote to caring for the offspring.

What is external fertilization explain with example?

external fertilization is a case in which fusion of male and female gametes takes place in outside environment/ medium and not in the body of the female . for example, in case of frogs , fertilization takes place in water medium . the female releases eggs in the water at the same time sperms are released too.

Why are environmental cues important for external fertilization?

We propose that environmental cues act as spawning 'inducers' by causing the release of hormones (gonad stimulating substance) in sensitive males, while biological cues (pheromones) from released sperm, in turn, act as spawning 'synchronizers' by triggering a hormonal cascade resulting in gamete shedding by ...

Why do animals with external fertilization almost always live in water?

External fertilisation of the female gamete by the male gamete takes place mostly in water; because water facilitates: extended period of gamete survival and easy movement of sperms towards egg.

What is external fertilization short answer?

External fertilization. Fusion of male and female gametes takes place inside the body. Fusion of male and female gametes take place outside the body. A female partner lays fertilized eggs or a fully grown young one. The female partner lays unfertilized eggs.

Why is internal fertilization more efficient than external?

Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. The embryo is isolated within the female, which limits predation on the young. ... Fewer offspring are produced through this method, but their survival rate is higher than that for external fertilization.

Why was internal fertilization necessary for reptiles birds and mammals?

In mammals, reptiles, birds, and some types of fish the gametes meet inside of the female's body. This is called internal fertilization. All land dwellers need to fertilize this way because sperm still prefer swimming to walking. ... The benefit is that it provides a safer environment for fertilization.

What are 2 advantages of internal fertilization?

Advantages of Internal Fertilization

The probability of successful fertilization is increased. The mates are selective. The chances of dehydration of gametes decreases. The young one is protected against predators and the outside environment and hence chances of survival are increased.

What is the advantage and disadvantage of external fertilization?

Also, it is easier to find mates as the gametes just need to be released and can drift away with wind or water. This results in greater genetic variation. The disadvantages however, are that there is reduced chance of survival from predators and harsh environments.

Why is the continuous reproduction of animals important to life on Earth?

The process of reproduction ensures that a plant or animal species does not disappear from Earth. This process is very important in maintaining stability in the ecosystem and for the continuation of life on earth. Had there been no reproduction, all the species would have become extinct.

What is external fertilization and its disadvantages?

In external fertilization, eggs have fewer chances of fertilization. This can lead to the wastage of a large number of the eggs during this process. Further, there is an absence of proper parental care to the offspring, which results in a low rate of survival in the progress.