Q.Draw label diagram of male and female reproductive organs in humans.
Answer:
Answer: Fertilization
which takes place inside the female body is called internal fertilization.
Internal fertilization occurs in many animals including humans, cows, dogs and
hens.
The fusion of a male and a female gamete takes place
outside the body of the female is called external
fertilization. It is very common in aquatic animals such as fish, starfish,
etc.
Q. Differentiate between
Viviparous and Oviparous Animals?
Answer: The animals which give
birth to young ones are called viviparous animals. eg. cat ,dog, lion etc.
Those animals which lay eggs are called oviparous animals.e.g. insect , fish
,frog, and reptile.
Q. What is
metamorphosis?
Answer: Metamorphosis is the process of the
transformation of larva into an adult through drastic change. For example pupa
into adult butterfly.
Metamorphosis does not occur in viviparous animals because the young one resembles the adult at
the time of birth.
Q. What do you mean by brooding?
Answer: In the hen, new
individual hens [chick] develop from hen’s egg in about 3 weeks. Hen provides
sufficient warmth to the egg to develop by sitting over it. This is called
brooding.
Q. How does an embryo obtain nutrition for grow and
develop its body parts?
Answer: an embryo obtains nutrition for grow and
develop its body parts from mother’s blood through placenta. The embryo
attached to the wall of uterus by placenta.
Q. What is test-tube baby?
Answer: Oviducts of some women
are blocked due to which these women are not be able to bear babies. In these
type of cases IVF or in vitro fertilization is done in which freshly released
egg and sperms are kept them together for a few hours.
Zygote is allowed to develop
for about a week and then it placed in the mother’s uterus and the baby is born
and this technique is called as test-tube babies.
Q. What is implantation?
Answer: The close attachment of
the embryo with the walls of uterus is called implantation.
Q. What is placenta?
Answer: A special tissue between the uterus wall and
the embryo (foetus) that fulfils the nutritional, respiratory and excretory
needs of the foetus from mother's body is called placenta.
Q. What is the function of amniotic fluid ?
Answer: The function of
amniotic fluid is to protect the foetus against temperature changes and
mechanical shocks.
Q. What is gestation?
Answer: The development of the foetus inside the
uterus till birth is called gestation.
Q. What is parturition?
Answer: The birth of a fully developed foetus after
the completion of gestation period is called parturition.
Q.
What are the differences between development of young ones in frogs and in humans?
Ans:
Development
in frogs
|
Development
in humans
|
It takes
place outside the body of the female.
|
It takes
place inside the body of the female.
|
Stages in
the development are egg, larva and adult.
|
Stages in
the development are foetus, young one and adult.
|
The young
one is different from the adult.
|
The young
one is similar to the adult.
|
Q. Why does a child show some characteristics
of the father and some of the mother?
Answer: The
process of fertilization is the meeting of an egg cell from the mother and a
sperm cell from the father. So, the new individual inherits some
characteristics from the mother and some from the father.
Q. Why do fish and frogs lay eggs in hundreds
whereas a hen lays only one egg at a time?
Answer: This is because the eggs and sperms get exposed to
water movement, wind and rainfall. Also, there are other animals in the pond
which may feed on eggs. Thus, production of large number of eggs and sperms is
necessary to ensure fertilization of at least a few of Unlike hen’s egg, frog’s egg is not covered by a shell and it is
comparatively very delicate. A layer of jelly holds the eggs together and
provides protection to the eggs
Q. Fill in
the blanks:
(a) Male and female have different
reproductive part testes and Ovaries respectively.
(b) Each parent produce special
sex cell called gamete.
(c) The gamete produced by male
and female is sperm and egg (Ovum) respectively.
(d) In most aquatic animal, external
fertilization takes place.
(e) On reaching the uterus, the
embryo attached to the wall of uterus by placenta. This is called implantation.
(f) In human fertilization of
sperm and ovum takes place in the interior part of Oviduct
(g) The process of
transformation of larva or tadpole into an adult through drastic changes is called
metamorphosis.
(h) A hermaphrodite is a
person who possesses the sexual organs of both male and female.
Q. Name the following:
(a) The organ which produces
sperm
(b) The organ which produces
egg
(c) The place where embryo
develops in human female
(d) The organ in reproductive
system which receives the sperm
(e) A muscular tissue which
delivers the sperm into vagina of female
(f) Name the method of asexual
reproduction in which individuals develops from the bud.
(g) Name the
process of reproduction in Amoeba.
Answer:
(a) Testes (b) Ovaries (c) Uterus (d) Vagina (e) Penis (f) Budding (g) Binary fission
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8th Chapter: Reaching the Age of Adolescence
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CBSE Solved Questions Paper- 3
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VIII
Reproduction in Animals
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Reproduction in
Animals [E-NOTES]
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CBSE Test Paper
[solved question]
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CBSE Worksheet for
practice
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Reproduction &
Endocrine [solved]
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Searches related to reproduction in animals for class 8
reproduction in animals class 8 ppt
reproduction in animals class 8 ncert
reproduction in animals for class 8
reproduction in animals ppt
reproduction in animals class 8 ncert
reproduction in animals for class 8
reproduction in animals ppt
reaching the age of adolescence class 8
reproduction in animals class 8 mcq
reproduction in animals class 8 notes
reproduction in animals class 8 mcq
reproduction in animals class 8 notes
Chapter 9- Reproduction in Animals
ReplyDeleteQ1. Name the following
1. Two modes by which animals reproduce.
2. The production of an exact copy of a cell or any other living part.
3. The process that ensures the continuity of similar kinds of indiviuals.
4. The fertilised egg is also known as.
5. The type of fission in Amoeba.
6. Two animals which show metamorphosis.
7. Babies born through the technique of invitro fertilisation.
8. Two animals showing external fertilisation.
9. Two animals showing internal fertilisation.
10. Name the scientist who cloned an animal for the first time sucessfully.
Science (from Latin scientia, meaning “knowledge”) is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.In an older and closely related meaning, “science” also refers to a body of knowledge itself, of the type that can be rationally explained and reliably applied
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