Which Of The Following Animals Is Not Able To Learn Immediately After Birth?

Reproduction in Animals Class 8 Extra Questions Science Chapter 9

Reproduction in Animals Course 8 Extra Questions Very Short Answer Questions

Question one.
What is reproduction?
Answer:
Reproduction is the biological process by which new private organisms are produced from their parents.

Question 2.
What is sexual reproduction?
Answer:
Reproduction which involves the fusion of male and female gametes is known every bit sexual reproduction.

Question 3.
What is fertilisation?
Answer:
The fusion of ova and sperm is called fertilisation.

Question 4.
What is a fertilised egg called?
Answer:
Zygote

Question five.
What is asexual reproduction?
Reply:
The mode of reproduction in which merely a single parent is involved.

Question 6.
Which mode of reproduction does take identify in human beings?
Reply:
Sexual reproduction

Question vii.
How many partners involve in sexual reproduction?
Answer:
Two (Parents)

Question 8.
Name two animals in which asexual reproduction takes place.
Answer:
Hydra and yeast

Question nine.
Name the reproductive organs of male person.
Respond:
A pair of testes, 2 spermducts and a penis.

Question ten.
Name the reproductive organs of female person.
Answer:
A pair of ovaries, oviducts and uterus.

Question xi.
Proper name the modes of reproduction.
Answer:

• Sexual reproduction
• Asexual reproduction.

Question 12.
What is male gamete or sperm?
Answer:
The reproductive cell produced by male reproductive organs is called male gamete or sperm.

Question 13.
What is female gamete or ova?
Respond:
The reproductive cell produced past female reproductive organs is called female person gamete or ova.

Question 14.
Which organ produces eggs or ovum?
Answer:
A pair of ovary.

Question 15.
Name the male gamete.
Reply:
Sperm

Question sixteen.
Proper name the female gamete.
Answer:
Ova or egg

Question 17.
Which male reproductive organ produces sperm?
Answer:
A pair of testes.

Question eighteen.
In which organ fertilisation take place in female?
Reply:
Fallopian tube

Question 19.
What are the two methods of asexual reproduction?
Reply:

• Budding
• Binary fission

Question 20.
Name two animals which undergo external fertilisation.
Reply:
Frog and fish

Question 21.
Proper name two animals which undergo internal fecundation.
Answer:
Human beingness and cow

Question 22.
Which type of reproduction takes place in Amoeba?
Respond:
Asexual reproduction through binary fission.

Question 23.
What type of reproduction is cloning?
Reply:
Asexual reproduction

Question 24.
What is foetus?
Answer:
Foetus is a well developed embryo.

Question 25.
What is IVF technique of reproduction?
Respond:
Information technology is fertilisation outside the body.

Question 26.
Requite the full form of IVF.
Answer:
In vitro Fecundation.

Question 27.
How are exam tube babies born?
Answer:
Exam tube babies are born through IVF technique.

Question 28.
What is cloning?
Answer:
Cloning is the production of exact copy of a role of or whole living trunk.

Reproduction in Animals Grade 8 Extra Questions Curt Answer Questions

Question i.
Explain ii modes of reproduction with examples.
Answer:
In that location are two modes of reproduction:

• Sexual reproduction: This blazon of reproduction takes place by fusion of male and female gametes; e.g., Homo beings, mammals like cow, buffalo, etc.
• Asexual reproduction: This mode of reproduction involves simply a unmarried parent; east.one thousand., Hydra, Amoeba, yeast, etc.

Question ii.
Explicate the procedure of fecundation in brief.
Answer:
Fusion of the male and female gamete, i.e., sperm and egg is called fertilisation. During fertilisation, the nuclei of the sperm and the egg fuse to course a single nucleus resulting in the formation of a fertilised egg or zygote.

Question 3.
What is internal fertilisation? Explain briefly.
Answer:
Fertilisation which takes identify inside the female person torso is called internal fertilisation. In this a smaller number of ova or eggs are produced. Offsprings have loftier chance of survival. Information technology occurs mostly in mam¬mals; eastward.g., in human existence, cow, buffalo, etc.

Question iv.
Explain briefly the external fertilisation.
Answer:
In external fertilisation, fusion of male and female gametes take place outside the female body. The female discharge many eggs in the water and the male person discharge sperms. The sperms swim to the eggs and fertilise them. It occurs in most of the aquatic animals similar frog, fish, starfish, etc.

Question 5.
How is an embryo adult?
Reply:
Fecundation results in the formation of zygote. The zygote divides repeatedly to give rising to a ball of cells which then begin to form groups that develop into dissimilar tissues and organs of the body. This developing structure is chosen an embryo. It gets embedded in the wall of the uterus for further development.

Question half-dozen.
Explain what is foetus.
Answer:
The embryo continues to develop in the uterus. It gradually develops dissimilar body parts such every bit hands, legs, head, eyes, etc. The stage of the embryo in which all the torso parts can be identified is called a foetus. Afterward its development is consummate, the mother gives birth to the baby.

Question 7.
What are viviparous and oviparous animals?
Answer:
The animals which give nascence to young ones are called viviparous animals and those which lay eggs are called oviparous animals. For example, Mammals including human beings are viviparous animals and hen, lizards, all birds, etc., are oviparous animals.

Question 8.
What are sperm and ovum? Explicate.
Reply:
The male person gamete is called sperm. It is produced past male person reproductive organ, testes. Structurally, it consists of a head attached to a long tail. The tail helps the sperm to move around. The head bears the modest nucleus.

Ovum are the female person gamete. They are too called egg. They are produced by the female reproductive organ. They consist of larger nucleus.
Both sperm and ovum are reproductive cells and contain single cell.

Question nine.
Explain briefly the life cycle of a frog.
Answer:
There are mainly 3 distinct stages in the life wheel of a frog, i.e., egg → tadpole (larva) → adult. Tadpoles wait different from the adults. Afterward one-time tadpoles are converted into an developed frog.

Question x.
Explain in short life cycle of silkworm.
Respond:
The life cycle of silkworm is completed in four stages.
Egg → Larva or Caterpillar → Pupa → Adult
In silkworm the caterpillar or pupa looks very different from the developed moth.

Reproduction in Animals Form 8 Extra Questions Long Answer Questions

Question i.
What do you mean by reproduction? Depict diverse modes of reproduction.
Answer:
Reproduction is an of import process which is responsible for the continuity of life on the planet earth. In this process, an private produces young ones of the aforementioned species. It helps in increasing the population of the same species on the globe, generation after generation. This is the fundamental characteristic which ensures the being of all life forms on the earth. There are two modes of reproduction:

• Sexual reproduction: In this type of reproduction, both male and female parents are involved and they produce dissimilar gametes called male gametes or sperms and female gametes or ova (egg) respectively. Both fuse to grade zygote which finally develops into foetus. For example, mammals including man beings higher invertebrates and all vertebrates undergo sexual reproduction.
• Asexual reproduction: In this type of reproduction, only unmarried parent is involved and gametes or sex cells are not produced. Budding, binary fission, etc., are dissimilar methods of asexual reproduc¬tion. Lower organisms similar Hydra, Amoeba, yeast, etc., undergo asexual reproduction.

Question 2.
What do y'all mean by metamorphosis? How does metamorphosis accept place in frog? Explain with a diagram.
Answer:
The transformation of the larva into an adult through drastic (sudden or abrupt) changes is called metamorphosis. For example, a moth emerging out of the cocoon, an adult frog from a polliwog, etc., undergo metamorphosis.

Frog undergoes through three stages during its life cycle in which eggs laid down past frogs transform into tadpoles (larva) and finally into an adult post-obit the process of metamorphosis. The following diagram clearly shows this process.

Question three.
Describe the male person reproductive organs with the help of a labelled diagram.
Answer:

The male reproductive organs mainly consist of a pair of testes, 2 sperm ducts (vas deferens) and a penis. Male gametes called sperms are produced by the testes. Though the sperms are very small in size, each has a head, a eye piece and a tail. It is unicelled with all the usual cell components. Figure ix.xiv shows the male reproductive organs in humans.

Question four.
Draw female person reproductive organs with the aid of a labelled diagram.
Answer:

The female reproductive organs mainly consist of a pair of ovaries, oviducts or fallopian tubes, uterus and vagina. The female gametes chosen ova or eggs are produced by ovary. In man beings, a single matured egg is released into the oviduct by 1 of the ovaries every calendar month. Uterus is the part inside which the embryo grows and develops finally into a baby. An egg or ovum is a single cell. Vagina is the office which receives the penis during copulation. The following diagram shows these organs clearly.

Question 5.
Explicate with a diagram the development of an embryo.
Answer:

An embryo is adult in the process of fecundation. Fertilisation results in the formation of zygote which begins to develop into an embryo [Refer Fig. ix.7(a)].

The zygote divides repeatedly to give rise to a ball of cell (Refer Fig. ix.7(b)) which further begin to grade groups that develop into unlike tissues and organs of the body. This developing structure is called an embryo. The embryo gets embedded in the wall of the uterus for further development [Refer Fig. 9.7(c)]. The embryo continues to develop in the uterus. Information technology gradually develops different body parts. This developing stage of embryo is chosen foetu (Fig. 9.16).

Question 6.
What is cloning? Explain how outset cloned mammal was built-in.
Answer:
Cloning is the production of an exact or a true copy of a cell, any other living role, or a consummate organ¬ism past asexual reproduction. Cloning of an animal was successfully performed for the first fourth dimension past Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh, Scotland. They cloned the sheep named Dolly on July five, 1996.

In the process of cloning Dolly, a cell was collected from the mammary gland of a female Finn Dorsett sheep [Fig. 9.17(a)]. Meanwhile, an egg was obtained from a Scottish greasepaint ewe [Fig. 9.17(b)]. The nucleus was removed from the egg. So, the nucleus of the mammary gland cell from the Finn Dorsett sheep was inserted into the egg of the Scottish blackface ewe whose nucleus had been removed. This egg was implanted into the Scottish blackface ewe. The egg adult usually and finally Dolly was built-in. Cloning of Dolly was a successful endeavor. Notwithstanding, many clones often die shortly later nativity. Sometimes cloning also leads to certain abnormalities among clones. Unfortunately, Dolly died on 14th February, 2003 due to a certain lung disease.

Question 7.
What is budding? Explicate.
Answer:
Budding is type of asexual reproduction in which an organism or new private develops from an outgrowth from a single parent. This outgrowth is called bud. On maturation this bud get separated from the parent'south trunk to grow into new individual. This process of reproduction is known as budding. For example, Hydra, yeast and sponges produce their young ones through the process of budding. In some organisms, like sponges, buds are not separated from their parent'south torso and course a colony. They remain attached to parent'southward body.

Question 8.
Explain how Amoeba reproduce?
or
Explicate in brief the process of binary fission.
Respond:
Amoeba reproduces through the process of binary fission. Binary fission is another method of asexual reproduction. Amoeba is a single-celled organism. It begins the process of reproduction by the partitioning of its nucleus into ii nuclei followed past division of its body into 2, each part receiving a nucleus. Finally ii daughter cells are produced from one parent Amoeba. This type of asexual reproduction in which an animal reproduces by dividing into two individuals is known as binary fission.

Question 9.
What is metamorphosis? Explain.
Answer:
Some insects and animals undergo a series of changes afterwards birth. Their immature ones look quite different from them. The features of these young ones are completely different from the adults. A biological procedure in which larva transforms into an adult through desperate changes (sudden and precipitous changes) in the body of the animal during the life cycle of an invertebrate or amphibian is chosen metamorphosis. For example, frog, butterfly, etc., undergo metamorphosis.

Question 10.
How are babies produced through IVF technique? What are such babies called?
Answer:
IVF (In Vitro Fertilisation), is an bogus type of fertilisation. Some women's oviducts are blocked and so they cannot conduct babies because sperms cannot achieve the egg for fertilisation. In such cases, freshly released eggs and sperms are kept together for a few hours for IVF (fertilisation outside the body). In example fertilisation occurs, zygote thus formed is immune to develop for a week and and then it is placed in the mother's uterus. Complete development of baby occurs in uterus and is built-in similar any other baby. Babies born through this technique are called exam tube babies.

Reproduction in Animals Class 8 Actress Questions College Order Thinking Skills

Question 1.
Although two cells called gamete fuse, the product formed is a single cell called zygote. Justify.
Answer:
During fecundation, simply the male nucleus moves into the egg cell and fuses to the egg nucleus to class zygote which is thus a single jail cell. The sperm remain outside the egg cell and degenerates subsequently some time.

Question 2.
The eggs of frogs exercise not have shells for protection, yet they are safe in water. How?
Reply:
A layer of jelly covers the eggs of frog and provides protection. Water assistance them to bladder and retain moisture. If eggs are laid in land and so they will dry up and die.

Question 3.
Mother gives nascence to a baby but the baby has characters of both parents. How?
Answer:
Human being beings show sexual reproduction. During fertilisation, two gametes, i from the mother and the other from father, fuse together to course zygote. Therefore babe developed from zygote has characters of both parents though mother gives birth to a babe.

Question 4.
Why do simply male person gametes have a tail?
Answer:
Male gametes accept to reach not-motile female gamete in oviduct from the vagina. And so they have a tail to attain the egg cell.

Question 5.
Though hen and frog both are oviparous but they have different types of fertilisation. Justify.
Reply:
In hen, internal fertilisation takes place. The fertilised egg develops into an embryo within the body. But development of chick from the embryo takes place outside the torso. On the other mitt, frog shows external fertilisation. The female frog discharge many eggs in the water and the male frog discharge sperms. The sperms swim to the eggs and fertilise them.

Question 6.
How does twinning occurs during sexual reproduction?
Reply:
Twins are ii offspring produced by aforementioned pregnancy. Non-identical twins results from two fertilised eggs when become implanted in the uterus wall at the same time.
Identical twins occur when a single egg is fertilised to class one zygote which then divides into 2 separate embryos.

Reproduction in Animals Class 8 Extra Questions Value-Based Questions

Question 1.
Ram with his family went to a picnic spot near a pond. He saw some jelly-like mass floating on the sides of the pond. He asked about this to his begetter. His male parent explained him that these are frog's egg and are millions in number. Ram wondered if all of them go hatched, what will happen to other aquatic animals?

• What blazon of fertilisation is shown past frog?
• Why do frog lay eggs in large corporeality?
• Is Ram's concern almost hatching of as well many eggs at a time will affect the aquatic animals correct? Why?
• What Value of Ram is shown here?

Reply:

• Frog shows external fertilisation.
• Bloodshed rate is very high for tadpoles as their predators are more than. Many of the eggs do not develop due to being not become fertilised. So for continuation of their species, they lay egg in large amount.
• No, his concern is not correct because well-nigh of the eggs either never develops or are preyed by other animals. Then survival chance of a frog from its egg to an adult frog is very low.
• Ram is inquisitive, future thinker and eco-concerned.

Activities and Projects
Question i.
Visit a poultry subcontract. Talk to the manager of the subcontract and try to find out the answers to the following.

• What are layers and broilers in a poultry farm?
• Exercise hens lay unfertilised eggs?
• How can you obtain fertilised and unfertilised eggs?
• Are the eggs that nosotros arrive the stores fertilised or unfertilised?
• Can you consume fertilised eggs?
• Is at that place any difference in the nutritional value of fertilised and unfertilised eggs?

Answer:
Visit a poultry farm, you can get answers to these questions. However, answers are given here for your help.

• Hens which lay eggs are layers and broilers are the hens used to get meat.
• Yes. Though hens lay fertilised eggs but in the poultry farms, the unfertilised eggs are obtained by induced ovulation.
• We tin can obtain fertilised eggs by normal procedure whereas unfertilised eggs tin can exist obtained by induced ovulation in a poultry farm.
• Both types of eggs are bachelor at stores.
• Yeah.
• Yes, fertilised eggs accept more nutritional value.

Question ii.
Detect live Hydra yourself and acquire how they reproduce by doing the following activity: During the summertime months collect water weeds from ponds or ditches along with the pond water and put them in a drinking glass jar. Later a day or so you may come across several Hydra clinging to the sides of the jar.
Hydra is transparent, jelly-similar and with tentacles. It clings to the jar with the base of its torso. If the jar is shaken, the Hydra will contract instantly into a small hulk, at the same fourth dimension cartoon its tentacles in.
Now take out few Hydras from the jar and put them on a sentinel drinking glass. Using a manus lens or a binocular or autopsy microscope, discover the changes that are taking place in their body. Note down your observations.
Answer:
Exercise it yourself.

Question 3.
The eggs we go from the market place are more often than not the unfertilised ones. In case you lot wish to observe a developing chick embryo, get a fertilised egg from the poultry or hatchery which has been incubated for 36 hours or more. You may then be able to see a white disc-like struc¬ture on the yolk. This is the developing embryo. Sometimes if the center and blood vessels have adult you lot may even see a cherry spot.
Answer:
Do information technology yourself at home.

Question 4.
Talk to a medico. Find out how twinning occurs. Look for any twins in your neighbourhood, or among your friends. Find out if the twins are identical or non-identical. Also discover out why identical twins are always of the same sexual practice? If you know of any story about twins, write it in your ain words. You could visit the post-obit websites for information on twins: www. keepkidshealthy.com/twins/expecting_twins.html.
For more than information on animal reproduction, you tin can visit:
world wide web.saburchill.com/chapters/chap0031.html
Respond:
Twinning ways producing two offspring at a time. It occurs in two means:

• Two ova or eggs (female person gametes) are released during ovulation and get fertilised.
• Single fertilised egg or ovum undergoes fission giving rise to two foetus.

In start case, twins are unidentical or unsimilar whereas in second example, they are identical or like. Since identical twins are born from aforementioned egg (ova) and sperm, i.e., same female person and male gametes, they always have aforementioned sex.
Students are advised to find out all these practically in their neighbourhood with friends.

I. Multiple Choice Questions (MCQs)
Choose the correct option.
Question one.
The number of modes by which animals reproduce are
(a) two
(b) three
(c) four
(d) none of these

Question two.
Binary fission is observed in
(a) Hydra
(b) yeast
(c) Amoeba
(d) human being

Question three.
Asexual reproduction is observed in
(a) cow
(b) buffalo
(c) sponge
(d) hen

Question 4.
In Hydra, the mode of reproduction is
(a) asexual
(b) sexual
(c) both (a) and (b)
(d) none of these

Question 5.
The animals that produce new young ones are chosen
(a) viviparous
(b) oviparous
(c) both
(d) none of these

Question 6.
The male gamete or sperm consists of
(a) 3 parts
(b) two parts
(c) four parts
(d) none of these

Question vii.
Ovum or eggs are formed in
(a) ovary
(b) testes
(c) penis
(d) ovident

Question 8.
Internal fertilisation takes place
(a) inside male trunk
(b) inside female person body
(c) outside female person body
(d) outside male trunk

Question nine.
In humans, the development of fertilised egg takes identify in the
(a) ovary
(b) oviduct
(c) testis
(d) uterus

Question 10.
The cell formed after fecundation is called
(a) embryo
(b) foetus
(c) zygote
(d) egg

Question xi.
The fusion of sperm and ova usually occur in the
(a) ovary
(b) uterus
(c) testes
(d) oviduct

Question 12.
Sets of reproductive terms are given below. Cull the ready that has an incorrect combination.
(a) Sperm, testis, sperm duct, penis
(b) Period, egg, oviduct, uterus
(c) Sperm, oviduct, egg, uterus
(d) Ovulation, egg, oviduct, uterus

Question xiii.
Which of the following shows external fecundation?
(a) Frog
(b) Human being
(c) Cow
(d) Hen

Question xiv.
Which 1 of the following is not a part of female person reproductive organs?
(a) Uterus
(b) Ovary
(c) Oviduct
(d) Penis

Question 15.
In the list of animals given below, hen is the odd one out.
'human being, cow, dog, hen'
The reason for this is
(a) it undergoes internal fertilisation
(b) it is oviparous
(c) it is viviparous
(d) it undergoes external fertilisation

Question xvi.
Animals exhibiting external fecundation produce a large number of gametes. Pick the appropriate reason from the following
(a) The animals are small in size and desire to produce more offsprings.
(b) Food is bachelor in plenty in water.
(c) To ensure improve chance of fertilisation.
(d) H2o promotes production of big number of gametes.

Question 17.
Which is not a viviparous animal?
(a) Human existence
(b) Cow
(c) Canis familiaris
(d) Butterfly

Question xviii.
Budding occurs in
(a) Amoeba
(b) domestic dog
(c) Paramecium
(d) yeast

Question 19.
The female person gamete is called
(a) ova
(b) sperm
(c) zygote
(d) uterus

Question 20.
The male gamete is called
(a) sperm
(b) ova
(c) embryo
(d) zygote
Answer:
ane. (a)
2. (c)
three. (c)
4. (c)
5. (a)
6. (a)
7. (a)
eight. (b)
9. (d)
10. (c)
eleven. (d)
12. (c)
thirteen. (a)
14. (d)
15. (b)
xvi. (c)
17. (d)
18. (d)
19. (a)
20. (a)

Two. Fill in the Blanks
Make full in the blanks with suitable word/s.
1. __________ is the process that ensures continuity of life on earth.
ii. __________ are the cells involved in sexual reproduction.
3. The animals which lay eggs are called __________.
iv. The animals which give nascency to young ones are chosen __________.
v. __________ is the process of fusion of gametes.
vi. The process of reproduction involving fusion of male and female gametes is called __________ reproduction.
7. The testes produce the male gametes called __________.
8. Sperms are __________ in size.
9. Sperm is a __________ cell.
x. The female reproductive organ consists of __________, __________ and __________.
11. The ovary produces female person gamete called __________.
12. An ova or egg is a __________ cell.
xiii. __________ is a fertilised egg.
14. Internal fecundation takes place within __________.
15. Babies born through __________ technique are chosen exam tube babies.
sixteen. __________ fertilisation takes identify outside the female trunk.
17. Fertilisation results in the formation of __________ and __________.
18. All living organisms take the power to __________.
xix. __________ produces sperm in male person.
twenty. In __________ reproduction just a single parent is involved.
Reply:
1. Reproduction
ii. Gametes
iii. oviparous
4. viviparous
5. Fertilisation
6. sexual
7. sperms
eight. very small
9. single
x. ovaries, oviduct, uterus
11. ova (egg)
12. unmarried
13. Zygote
14. female person body
15. IVF
16. External
17. zygote, embryo
18. reproduce
xix. Testes
20. asexual

3. Lucifer the post-obit
Lucifer the items given in column I suitably with those given in column II.

Answer:
1. (b)
two. (a)
3. (east)
4. (c)
5. (d)
6. (thou)
7. (h)
viii. (i)
nine. (j)
10. (f)

IV. True or False
State whether the given statements are true or false.
one. Zygote is an unfertilised egg.
two. External fertilisation occurs in frog.
3. An embryo is made upward of multicells.
4. Amoeba reproduces by budding.
5. Fertilisation is non necessary in asexual reproduction.
vi. Each sperm is multicellular.
7. A new young one is adult from a cell called gamete.
8. Cloning is a sexual reproduction method in any living organisms.
9. Viviparous animals give birth to young ones.
ten. Male gametes are sperms.
11. Female gametes are ovum.
12. Starfish reproduces by external fertilisation.
13. Two individuals are needed for sexual reproduction.
14. Internal fertilisation occurs in dogs and cats.
15. An embryo grows in uterus.
Answer:
1. False
2. True
3. True
4. False
5. True
6. Simulated
7. False
8. Faux
ix. True
ten. True
11. Truthful
12. True
xiii. True
14. Truthful
xv. Truthful

Extra Questions for Course 8 Scientific discipline

Source: https://www.learncbse.in/reproduction-in-animals-class-8-extra-questions/

Posted by: leewelesepind.blogspot.com

Share this post