Table of Contents
Why do animals reproduce Class 4 short?
Reproduction is very essential for the continuation of a species or a group of animal. It ensures the continuation of similar kind of individuals (animals) generation after generation. Animals, which give birth to their young one, the baby develops inside the body of the mother.
Why does internal fertilization produce fewer offspring?
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. Even though fewer offspring are produced through this method, their survival rate is higher than that for external fertilization.
What are animals that reproduce in fewer number?
Answer: Prokaryotes are organisms that consist of a single prokaryotic cell. Eukaryotic cells are found in plants, animals, fungi, and protists.
What are animals that can reproduce in large number?
Selina Heppell, head of the Department of Fisheries and Wildlife at Oregon State University, says other fish known to have high numbers of eggs include sturgeon (up to 2.5 million eggs for Atlantic sturgeon) and large tuna (bluefin tuna can produce 10 million eggs a year).
Why do animals need to reproduce offsprings?
Reproduction ensures the continuation of the species. Animals will only reproduce with the fittest of the species and choose not to mate with animals with the disease or in periods of drought or lack of food. Some animals require a mate to reproduce, while other species can reproduce alone.
How do animals grow and multiply?
New organisms are produced from other organisms by a process called reproduction. The whole process of sexual reproduction in animals begins with the formation of sperm from the male and eggs from the female. Next, the sperm and egg join together to form a zygote.
What kind of fertilization happens when sperm cells are released into the body of the female animal?
external fertilization
Internal fertilization is the union of an egg and sperm cell during sexual reproduction inside the female body. Internal fertilization, unlike its counterpart, external fertilization, brings more control to the female with reproduction.
What is the advantages and disadvantages of internal fertilization?
Internal fertilization Increase chance gametes meet and greater change of successful fertilisation. More protection against outside environments and predators, and therefore a higher chance of surviving until birth. More selective of their mates. Less chance of desiccation of gametes.
Is it possible for humans to undergo asexual reproduction Why?
Answer: Humans cannot reproduce with just one parent; humans can only reproduce sexually. Bacteria, being a prokaryotic, single-celled organism, must reproduce asexually. The advantage of asexual reproduction is that it can be very quick and does not require the meeting of a male and female organism.
Which animals can reproduce asexually?
Animals that reproduce asexually include planarians, many annelid worms including polychaetes and some oligochaetes, turbellarians and sea stars. Many fungi and plants reproduce asexually.
Why do we need so many sperm to fertilize an egg?
Additionally the sperm have to be chromosomally normal (many are not – no matter the man’s age) and undergo several complex steps to get to the egg and fertilize it. Once the lucky sperm does enter the egg to start the fertilization process the egg seals itself from other sperm entering. Ta-da: an embryo is made.
How are animals able to produce different types of offspring?
Species that reproduce sexually (and have separate sexes) must maintain two different types of individuals, males and females. Only half the population (females) can produce the offspring, so fewer offspring will be produced when compared to asexual reproduction.
Why do some animals lay more eggs than others?
Ducks, on the other hand, have larger broods because they have many predators, but also lots of available food; the more ducklings they have, the more chances that at least some of them will reach adulthood and pass their genes on to the next generation. Originally Answered: Why do some animals lay less eggs?
Why are there so many sperm in the cervix?
The cervical mucous, particular at the borders, is compact with a microarchitecture that is hard for abnormal sperm, or sperm that cannot swim properly, to penetrate. Yet another challenge in the cervix is the female’s immune response to sperm.