What is external fertilization why is it disadvantages compared to internal fertilization?

Internal fertilisation occur in organisms like human and external fertilisation occur in organisms like frogs. 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.

What is external fertilization example?

Fish. Salmon, cod, trout, and char are all examples of the fish that externally fertilize. The female and male both release their gametes into the water, where they diffuse together and fertilize.

What is external fertilization explain the process with an 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.

What is external fertilization why it is advantages compared to internal fertilization?

Advantages of External Fertilization It is known to produce a much larger number of offspring as compared to internal fertilization. Results in increased genetic variations. It becomes easier to find mates as the gametes that are released tend to drift away.

What is heartbeat class 7 ncert?

Heartbeat. The walls of the chambers of the heart are made up of muscles. These muscles contract and relax rhythmically. This rhythmic contraction followed by its relaxation constitute a heartbeat.

What is internal fertilization and external fertilization?

External fertilization is a mode of reproduction in which a male organism’s sperm fertilizes a female organism’s egg outside of the female’s body. It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.

What is meant by internal fertilization and external fertilization explain with examples?

Internal fertilization happens inside the body, for example, mammals having sex or artificial insemination to create an embryo. External fertilization happens outside the body, for example, fish spawning in a river or in vitro fertilization. Biology. Science for Eighth Class. Standard VIII.

What is the advantage of external fertilization over internal fertilization?

Advantages of External Fertilization It results in increased genetic variations. It produces a larger number of offsprings. The gametes released can drift and therefore it is easy to find mates.

What is the advantage of fishes reproduce through external fertilization?

External fertilization in an aquatic environment protects the eggs from drying out. Broadcast spawning can result in a greater mixture of the genes within a group, leading to higher genetic diversity and a greater chance of species survival in a hostile environment.

What is the function of the acrosomal reaction in the sea urchin?

The acrosomal reaction in sea urchins Contact with egg jelly causes the exocytosis of the sperm’s acrosomal vesicle and the release of proteolytic enzymes that can digest a path through the jelly coat to the egg surface (Dan 1967; Franklin 1970; Levine et al. 1978).

What is the function of the fertilization membrane?

The membrane that forms on the inner surface of the vitelline membrane of the ovum after the entry of a spermatozoon, thereby acting as a barrier to prevent additional penetration of other spermatozoa.

What prevents more than one sperm from fertilizing an egg quizlet?

The cortical reaction is a process initiated during fertilization by the release of cortical granules from the egg which prevents polyspermy, the fusion of multiple sperm with one egg.

What relationship exists between the sea otters and sea urchins?

relationship because both species benefit from the interaction. The sea otters help the kelp by eating the sea urchins because if there is too big of a population of sea urchins the kelp is endangered. The kelp in return provides and anchors for the sea otters while they are sleeping and doing daily activities.

What’s the meaning of fertilization?

Fertilization: The process of combining the male gamete, or sperm, with the female gamete, or ovum. The product of fertilization is a cell called a zygote.

Where does external fertilization occur in frogs?

External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. After the sperm reaches the egg, fertilization can then take place. Typically, frogs lay eggs.

Where the fertilization does takes place in human female?

Fertilization of an egg by a sperm normally occurs in the fallopian tubes. The fertilized egg then moves to the uterus, where it implants to the uterine lining.

Which of the animals undergo external fertilization?

Birds, fish, amphibians, reptiles, insects, coral, sea anemonoes, other related reef creatures such as the sea fan and the sea feather, shellfish, and platypus etc.. undergoes external fertilization.

Who is responsible for baby gender?

Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother’s X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother’s to make a boy (XY).