In these animals, fertilization takes place in water. The male gametes are deposited in the body of the female with the help of copulatory organ. Let’s discuss below the difference between external and internal fertilization. Mollusca.Mollusca is a phylum of species that range from the cuttlefish to the sea snail. These two evolutionary advances required the previous development of internal fertilization. Upvote(0) How satisfied are you with the answer? External fertilization, on the other hand, is the process of fertilizing the egg outside the female’s body. The similarity between internal fertilization and external fertilization is that the sperm fuses with the egg cell to form a zygote. Fertilization can be external or internal. It occurs inside the body of the female. 2)As it travels down the oviduct, many protective layers are formed around the embryo.The hard shell that we see in a hen’s egg is the outermost protective layer. Answered By . In most of the animals like human beings, cats, lions, pigs, dogs, hens, etc internal fertilization takes place. Humans provide an example of the former whereas seahorse reproduction is an example of the latter. Discuss internal and external methods of fertilization; Describe the methods used by animals for development of offspring during gestation ; Describe the anatomical adaptions that occurred in animals to facilitate reproduction; Sexual reproduction starts with the combination of a sperm and an egg in a process called fertilization. This is seen in most terrestrial animals as well as some aquatic animals. Intromittent organ: the external organ of a male that is used to deliver sperm for internal fertilization. After the sperm reaches the egg, fertilization takes place. takes place inside the female body. takes about 26 hours for a hen to make an egg, and she can start . The rooster mounts the hen and they touch cloacae (or vents). Consideration as to whether an animal (more specifically a vertebrate) uses internal or external fertilisation is often dependent on the method of birth. Similarly, you may ask, is fertilization in molluscs external or internal? Internal fertilisation take place in hen also. External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. Internal vs External Fertilization & Development. puberty only 18-24 weeks after hatching out of an egg herself. And in this type of fertilization development of zygote takes place inside the mother’s body only and they get all kinds of nourishment from her. Fertilization • Fertilization is the union of egg and sperm – Egg (n) + Sperm (n) = zygote 2n. Let us find out how this happens. Internal. In humans, most of the animals like cats, lions, pigs, dogs, hens, etc., the fusion of gametes takes place internally. Life history: the development an organism goes through (or the changes it experiences) over its entire life. Answer. The sperm packet is moved from the rooster to the hen. 9. External Fertilization • External fertilization occurs outside of female parent – Fish – Amphibians – Aquatic vertebrates. The process in which there is a fusion of sperm with the egg also known as the Ovum to produce Zygote is called Fertilization. For internal fertilization to happen there needs to be a method for the male to introduce the sperm into the female's reproductive tract. (i) The hens give birth to chicks like human beings give birth to babies. Internal fertilization, unlike its counterpart, external fertilization, brings more control to the female with reproduction. The female then lays and looks after the fertilized egg hatches into a chick. This can occur either inside (internal fertilization) or outside (external fertilization) the body of the female. The eggs of oviparous animals are covered with hard or soft shells, depending on the animals. Site of Reproduction. (f) An embryo is made up of a single cell. Soln: Answer is (b) oviparous with external fertilisation. aryan9467 aryan9467 Answer: Fertilisation in hen takes place in inside the body of female hen.. whereas in frog fertilisation takes place outside the frog body. In oviparity, fertilized eggs are laid outside the female's body and develop there, receiving nourishment from the yolk that is a part of the egg. In hen - There is inner fertilisation and outer development. (e) External fertilization takes place in the frog. Click to see full answer. If the fusion takes place within the female parent, it is called internal fertilization. Internal fertilization occurs in many animals including humans, cows, dogs and hens. Do hens have internal fertilization or external fertilization 2 See answers pranaykumar114 pranaykumar114 Internal Fertilization. (g) Oviparous animals give birth to young ones. ... Fertilization is internal. B. Internal vs External Fertilization. External Fertilization. A hen's eggs begin as yolks in the ovary, and once released they pass into the infundibulum, a funnel-shaped organ where the sperm are waiting. In many animals fertilization takes place outside the body of the female. External. fertilization in frog is external while in the case of hen it is internal. 1)After fertilisation takes place inside the body of the hen, the fertilised egg or zygote divides repeatedly to form embryo which travel down the oviduct. C. Both A and B. D. None of the above. They mate simply by pressing their cloacas together in what is known as a 'cloacal kiss' - the cloaca is the single opening birds use to excrete, mate and lay eggs, in case you didn't know. Internal fertilization: when a male sperm fuses with a female egg inside the female’s body. There they are fertilized, and pass out of the chicken via the same route the sperm entered. The chicken’s reproductive system is essentially divided into two parts: the ovary (responsible for producing the egg yolks) and the oviduct (where the egg white, membranes and shell develop around the yolk). Is Snake fertilization internal or external? Fewer offspring are produced through this method, but their survival rate is higher than that for external fertilization. 4) Very productive Chickens are egg-laying machines. toppr. External and internal fertilization are two types of fertilization methods seen in sexual reproduction. Internal. Explanation: Aquatic animals lay eggs and release sperms into water for fertilization to take place. Both processes involve fusing male gametes with female gametes. Most birds do not have a penis. days in their chicken coops all year around. Mobile male games and immobile female gametes are produced in both internal and external fertilization. 2. Fertilization is external in some crustaceans and internal in others. What is Internal Fertilization. However, in other animals like hen, the male inseminates the female, resulting in internal fertilization. Internal fertilization means the egg and the sperm meet inside the mother's body. Similarities Between Internal And External Fertilization . External fertilization is a method of fertilization in which a sperm cell fused with an egg cell in the open, rather than inside the specialized organs within the bodies of the parents. Internal fertilization refers to the fusion of gametes inside the female organism during sexual reproduction. The dissimilarity is that in internal fertilization, the fusion occurs inside the body of the organism while in external fertilization, the fusion occurs outside the body of the organism. MEDIUM. The egg white gathers around the yolk in the magnum. External fertilization: Internal fertilization It occurs outside the body of the female. Internal fertilization is the union of an egg and sperm cell during sexual reproduction inside the female body. The major difference between external and internal fertilization is that the external fertilization occurs outside the female body while the internal fertilization occurs inside the female body. External Fertilization. Key Terms: Egg cell, External Fertilization, Internal Fertilization, Oviparity, Spawning, Sperms, Viviparity, Zygote. Internal Fertilization (In Vivo) In this type of fertilization, the fusion of sperm with egg occurs within the body of a female. Abstract. (d) oviparous with internal fertilisation. (d) A zygote is formed as a result of fertilization. Fertilisation in frog is - Outer intercourse or fertilisation and outer development. So, the correct answer is option B. Fertilization has been classified into two: External fertilization and internal fertilization. (h) Internal fertilization takes place in hens. eggs--up to 300 a year. External Fertilization. A large number of gametes are released into the surrounding medium (e.g., water) where fertilization takes place. Both occurs in plants and animals ; The final product of both internal and external fertilization is the zygote. The embryo is isolated within the female, which limits predation on the young. A hen hits . In the isthmus, the shell membranes are laid down. Typically, frogs lay eggs. It only . In this type, a zygote is formed within the mother and gets its nourishment from her. Chickens and fish, for example, reproduce by external fertilization. Fertilization which takes place inside the female body is called internal fertilization. In this way, is Frog fertilization internal or external? Reptile - Reptile - Courtship and fertilization: The evolution of amniotic development and the shelled egg enabled vertebrates to become fully terrestrial. It is called internal fertilization because the process of reproduction i.e. During internal fertilization, the sperm fertilizes the egg cell inside the female’s body. First the eggs are laid, then they're fertilized by the male. producing another one 40-60 minutes later. Humans reproduce using internal fertilization, also known as sex. It is the vital and primary stage of sexual reproduction. The size of the eggs is also characteristic of the animal. What is Internal Fertilization? What's more, hens lay a lot . External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. Internal fertilization enhances the fertilization of eggs by a specific male. Contrary to popular misconception, there is a major difference between internal and external fertilization. Internal fertilization has the advantage of protecting the fertilized egg from dehydration on land. 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