Cbse Class 8 Chapter 9 Science
Question 1. Explain xhapter importance chapyer reproduction in organisms. Answer: Reproduction is a vital phenomenon on this planet earth which is essential for existence and continuity of life and species on it, generation after generation. Question 2. Describe Cbse Class 8 Chapter 9 Science<Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science /strong> the process of fertilisation in human beings. Answer: Cbse Class 8 Science Question Paper Sa2 2018 In the process of fertilisation, sperms come in contact with an ova egg. One of the sperms may fuse with the egg. The nuclei of the sperm and the Class Cbse Science Chapter 9 8 egg fuse to form cbsf single nucleus resulting in the formation of a fertilised egg called zygote.
In human being, the fertilisation takes place inside the female body, known as internal fertilisation. Question 3.
Choose the most appropriate answer. Question Cbse Class 8 Chapter 9 Science 6. Define asexual reproduction. Describe two methods cbse class 8 chapter 9 science asexual reproduction in animals. Answer: Cgse mode of reproduction in which only a single parent is involved is claxs asexual reproduction. In this type Cbse Class 8 Chapter 9 Science of reproduction, sex cells gametes are not produced and no fusion of gametes takes place for the reproduction of chaptr or offsprings.
Asexual reproduction takes place in Amoeba, Hydra, yeast, starfish, sponges. There are mainly two methods of Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science asexual reproduction: i Binary fission: In binary fission, a single parent zcience is divided into two equal individual cells chaptrr in Zcience. It divides into two by division of their bodies, each of them gets cbse class 8 chapter 9 science nucleus chapher develops into separate individual. The figure given below shows how binary fission occurs in Amoeba.
This type of reproduction is shown in Hydra. The following figure shows budding in Hydra. Question 7. In which Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science female reproductive organ does the embryo get embedded?
Answer: Uterus. Question 8. What is metamorphosis? Give examples. Example, frog and butterfly. Question 9. Differentiate between internal fertilisation and external fertilisation.
Question Complete the crossword puzzle using the hints given. Across Cbse Class 8 Chapter 9 ScienceCbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science trong> 1. The process of the fusion of the gametes. The chapfer of fertilisation in a hen. The term used for bulges observed chaptdr the sides of the body of Hydra.
Eggs are produced. Down 2. Sperms are produced in these male reproductive organs 3. Another term for the fertilised egg. These animals lay eggs. A type of fission in Amoeba. Cbse class 8 chapter 9 science down the colour and size of the eggs. Solution: Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science The colour of the eggs is dull white and the size is less than a centimetre. Were you able to collect eggs of all of them? Make drawings of the eggs that sciene have collected. Solution: The picture of Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science the eggs of some organisms are shown below Fig.
You can make drawings of the eggs of other animals if you have collected. Observe them using hand lens or a microscope. Look out for any bulges from the Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science parent body. Count the number of bulges that chaptef see in different slides. Also, note the size of the bulges. Draw the diagram of Hydra, as you see it. Compare it with Fig. Solution: We observe that Hydra use regenerative cells for developing new individuals in the process of budding.
Also buds develop in Hydra as outgrowth due to sciemce cell division at one specific site. This entire process is called budding which is an asexual mode Cbse Class 8 Chapter 9 Science of reproduction in which only a single parent is involved. Name the male reproductive organs. Answer: The male reproductive organs are a pair of testis, sperm ducts and a penis.
Question 4. Name the organ producing the male gametes. Answer: Testis produce the male gametes. Question 5. What are sperms? Answer: The male gametes produced by the testis are known as sperms. Give the structure of sperm. Answer: A sperm has a head, a middle piece and Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science a tail.
Draw a labelled diagram of sperm. Is the sperm a cbse class 8 chapter 9 science cell? Answer: Yes, the sperm is a single cell with all the cell components. Name cbse class 8 chapter 9 Cbse Class 8 Chapter 9 Science science female cbxe organs. Answer: The female reproductive organs are a pair of ovaries, oviducts and the uterus. Name the organ in the female body where development of the baby takes place.
Is the egg single cell? Answer: Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Yes, the egg is also a single cell. What type cbse class 8 chapter 9 science fertilisation takes place in humans and dogs? Answer: Internal fertilisation. What type of fertilisation takes place in fish? Answer: External fertilisation. What is Cbse Class 8 Chapter 9 Science an embryo?
Answer: The zygote divides repeatedly to form an embryo. What is a foetus? Answer: The stage of the embryo in which all the body parts are identifiable is called a foetus. When does the mother giye birth to the young one? Answer: When the development of the foetus is complete, the mother gives birth to the young one.
How much time does the embryo of hen take to develop into a chappter Answer: About Cbse Class 8 Chapter 9 Science three weeks. What name is given to animals which give birth to young ones? Class Viviparous animals. What name is given to animals which lay their eggs? Answer: Oviparous animals. Do you think metamorphosis takes place in humans?
Answer: 9 Science Chapter 8 Class Cbse No, in humans the body parts similar to the adults are present from the time of the birth. Define budding. Answer: Budding is the type of asexual reproduction in which new individuals develop from the buds. Name the method by which Amoeba reproduces. Answer: Amoeba reproduces by binary fission. All animals finally die, yet the species survives.
16:54:It starts out with cbse class 8 chapter 9 science drunks strolling along a side of the Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science corn margin when positively a single of them spots 2 druggies out in the fishing vessel approach out in which corn margin rught away. A Seventeen carried out admirably. Afterwards I glued as well as screwed a matching density plywood which they had upon budding of a supports??Still calss.


Answer: The stage of the embryo in which all the body parts can be identified is called a foetus. A human embryo becomes a foetus after Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science about 8 weeks of pregnancy. What is metamorphosis? Give two examples of metamorphosis. Answer: The transformation of the larva into an adult through drastic changes is called metamorphosis.
Metamorphosis occurs in frog and silk moth. What is the difference Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science between viviparous animals and oviparous animals? Answer: Difference between viviparous animals and oviparous animals:. Which of the following are oviparous animals and which are viviparous animals?
Answer: Oviparous animals � Frog, sparrow, lizard, hen, fish, butterfly Viviparous animals � Human being, dog, cat. Give five example each of animals which develop : a inside the mother. Answer: a The animals which give birth to young one are called viviparous animals. In such animals, the baby develops inside the Cbse Class 8 Chapter 9 Science body of the mother. Examples of Viviparous animals � Human beings, cat, dog, cow, tiger.
In such animals, the baby develops inside eggs that the mother lays. Examples of Oviparous animals � Frog, sparrow, lizard, hen, fish, butterfly.Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science
Explain how, chicks are born. Answer: In hens, internal fertilization take place but they do not give birth to chicks like human beings. After fertilization, the zygote divides repeatedly to form embryo which travels down the oviduct. As it travels down, many protective layer are formed around it. After the hard shell is formed around the developing embryo, the hen finally lays the egg. The hen, then sits on the egg to provide sufficient warmth to the Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science eggs for the development of the embryo into the chicks.
The embryo takes about 3 weeks to develop into a complete chick. Name two animals which undergo metamorphosis and two which do not. Answer: Frog and silk moth Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science undergo metamorphosis whereas cow and hen do not undergo metamorphosis.
Which of the following animals undergo metamorphosis and which do not? Cow, Butterfly, Silk moth, Humans, Frog, Housefly, Sparrow, Hen, Mosquito, Money Answer: Butterfly, silk moth, frog, housefly Cbse Class 8 Chapter 9 Science and mosquito undergo metamorphosis while cow, human, hen and monkey do not undergo metamorphosis.
Question 54 A. What are gametes? Answer: The cells involved in sexual reproduction are called gametes. Question 54 B. In which sort of reproduction are Cbse Class 8 Chapter 9 Science gametes fuse? Answer: Fertilization is the step of reproduction in which fusion of gametes take place. Question 54 C.
What is formed when two gametes involved? Answer: Zygote is formed when two gametes Class 10th Ncert History Chapter 4 List are fused together. Question 54 D. What is this act of fusion called? Answer: The fusion of a sperm with an ovum to form a zygote during sexual reproduction is called fertilization. Differentiate between internal fertilization and external fertilization.
What type of fertilization takes place in a frog, and b fox? Answer: Differences between internal fertilization and external fertilization:. State whether gametes are involved in cloning or not.
Name two animals which have been produced by cloning. Answer: Cloning is the production of an exact copy of a cell, any other living part, or a complete organism.
Yes, gametes are involved in cloning. Dolly and noah are two cloned animals. Answer: Reproduction is one of the important characteristics of living Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science things. The ability of organism to produce young ones of its own kind is called reproduction. It is essential for the continuation of a species. Define asexual reproduction. Name two methods of asexual reproduction in animals.
Name two animals Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science 8 Science Chapter 9 Cbse Class which reproduce by these asexual reproduction methods. Answer: The type of reproduction in which only a single parent is involved is called asexual reproduction.
Binary fission and budding are two methods of asexual reproduction in animals. Amoeba reproduce Cbse Class 8 Chapter 9 Science by binary fission and Hydra reproduce by budding. What is a clone? Name one famous clone. Answer: The organisms which are produced asexually are genetically identical to the parent and are called clones. Question 61 A.
Describe the Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science process of fertilization in human beings. Answer: The fusion of male and female gametes to form zygote is known as fertilization. The process of fertilization takes place in the fallopian tube oviduct.
As sperm enter into the vagina through Cbse Class 8 Chapter 9 Science Chapter 8 Class Science 9 Cbse the process of copulation; it moves upwards and enter into the oviduct. In the oviduct, ovum fuse with the sperm to form zygote. Question 61 B. Draw a labeled diagram to show the fertilization of a human egg 8 Cbse Science 9 Chapter Class Cbse Class 8 Chapter 9 Science by a sperm to form a zygote. Question 62 A. What type of couples are helped to have babies by the in vitro fertilization technique?
Question 62 B. Answer: In IVF or invitro fertilization technique, is a process by which an egg is fertilised by the sperm outside the body. Question 63 A. What are viviparous animals?
Give two examples of viviparous animals. Answer: The animals which give birth to young ones are called viviparous animals. Human Cbse Class 8 Chapter 9 Science beings and cow are examples of viviparous animals. Question 63 B. What are oviparous animals? Give two examples of oviparous animals. Answer: Those animals which lay eggs are called oviparous animals. Examples � Hens and frog.
How does Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science an Amoeba reproduce? Describe with the help of labeled diagram. Answer: Amoeba reproduces by common asexual method called binary fission. In this method, Amoeba cell divides into two equal daughter cells.
The nucleus of amoeba first divides into two Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science parts. After that the cytoplasm of amoeba divides into two parts, one part around each nucleus.
This leads to the formation of the two daughter Amoebae cell having a nucleus and its own cell organelles. How does a Cbse Class 8 Chapter 9 Science Hydra reproduce? Explain with the help of labeled diagrams.
Answer: Hydra reproduces by budding. In hydra, there may be one or more bulges. These bulges are the developing new individual and they are called buds.
This bud then grows Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science gradually to form a small hydra by developing a mouth and tentacles. The tiny new hydra detaches itself from the parent body and become new independent individual. Internal fertilization occurs : A. The number of nuclei present in a Cbse Class 8 Chapter 9 Science zygote is : A. Explanation: Zygote is the formed due to fertilization of the gametes.
During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. A tadpole develops into an adult frog by the process of : A. Fertilization results immediately in the formation of : A. Which of the following is not a part of the human male reproductive system? It is a part of female reproductive system. Which of the following is Cbse Class 8 Chapter 9 Science not a viviparous animal? The multicellular organism which reproducts by buddings is : A.
Amoeba B. Yeast C. Paramecium D. Hydra Answer: D. Hydra Hydra is a multicellular organism which reproduce by budding. In asexual reproduction, two offsprings having Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science the same genetic material and the same body features are called : A.
Which of the following animal does not show metamorphosis? Asexual reproduction is : A. Which of the following organisms reproduces by binary fission?
Hydra B. Amoeba D. Sea Cbse Class 8 Chapter 9 ScienceCbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science ng> anemone Answer: C. Amoeba Amoeba, a unicellular organism reproduce by binary fission. Which of the following is not an oviparous animal?
Tadpole is the larva of : A. The production of an exact copy of an animal by asexual Cbse Class 8 Chapter 9 Science reproduction is known as : A. One of the following is not a part of the human female reproductive system. This one is : A. Reproduction is essential for living organisms in order to : A. It is essential for the Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science continuity of species. One of the following occurs reproductive system of flowering plants well as that of humans.
This is : A. In both of them, it produces female gametes called egg. In human males, the testes lie in the Cbse Class 8 Chapter 9 Science 8 Class Cbse Science Chapter 9 Cbse Class 8 Chapter 9 Science scrotal sacs outside the body because it helps in the : A. Characterstics that are transmitted from parents to offsprings during sexual reproduction show : A.
The offspring formed as a result of sexual reproduction exhibits more variations because : A. Two Cbse Class 8 Chapter 9 ScienceCbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science ng> very small organisms X and Y both reproduce by the method of budding.
Organism X is industrially very important because it is used in making alcohol from sugar. It is also used in making bread. Organisms Y is a tiny Class 9 Maths Chapter 3 Question Answer Github animal having tentacles which live in water. Answer: a X is Yeast.
Explanation: Yeasts are unicellular fungi which convert glucose into alcohol through the process of fermentation. Yeast belongs to the fungi of living organisms. Explanation: Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Yeast is a single-cellular organism which divides by mitosis and shows budding. Fungi have the following characteristics:. Explanation: Yeasts are unicellular organisms because they are single-celled organisms.
Hydra are multicellular organisms with complex bodies. A unicellular organism P lives in pond water. The organisms P has no fixed shape, its shape keeps on changing. It moves and catches its prey with the help of organs Q which keep on appearing and disappearing.
The organisms P reproduces Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science by a process R. Another organisms S also reproduces by this process. Name P, Q, R and S. The animal A which is classified as an amphibian lays eggs in pond water. The hatching of its eggs produces a Cbse Class 8 Chapter 9 Science tailed-form B which looks very different from the animal A. The form B then undergoes a change C and gets converted into animal A. Answer: a Animal A is Frog and form is Tadpole.
The breathing organ of Science Class 9 8 Chapter Cbse Tadpole is gills. X and Y are the two types of animals. The animals like X undergo external fertilization whereas animals like Y undergo internal fertilization. The animals like X lay eggs from which baby animals are hatched. On the other hand, in animals like Y, the young one develops inside the uterus of mother which then gives birth to the baby.
Compare it with Fig. Solution: We observe that Hydra use regenerative cells for developing new Cbse Class 8 Chapter 9 Science individuals in the process of budding. Also buds develop in Hydra as outgrowth due to repeated cell division at one specific site. This entire process is called budding which is an asexual mode of reproduction in which only Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science a single parent is involved. Name the male reproductive organs. Answer: The male reproductive organs are a pair of testis, sperm ducts and a penis.
Question 4. Name the organ producing the male gametes. Answer: Testis produce the male Cbse Class 8 Chapter 9 Science 8 9 Chapter Science Cbse Class Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science gametes. Question 5. What are sperms?
Answer: The male gametes produced by the testis are known as sperms. Give the structure of sperm. Answer: A sperm has a head, a middle piece and a tail. Draw a labelled Science Class 8 Cbse Chapter 9 diagram of sperm. Is the sperm a single cell? Answer: Yes, the sperm is a single cell with all the cell components.
Name the female reproductive organs. Answer: The female reproductive organs are a pair of ovaries, oviducts and the uterus.
Name the organ in the female body where development of the baby takes place. Is the egg single cell? Answer: Yes, the egg is also a single cell. What type of fertilisation takes place in humans and dogs? Answer: Internal fertilisation. What type of fertilisation takes place in fish? Answer: External fertilisation. What is an embryo? Answer: The zygote divides repeatedly to form an embryo. What is a foetus? Answer: The stage of the Cbse Class 8 Chapter 9 Science embryo in which all the body parts are identifiable is called a foetus.
When does the mother giye birth to the young one? Answer: When the development of the foetus is complete, the mother gives birth to the young Cbse Class 8 Chapter 9 Science one. How much time does the embryo of hen take to develop into a chick?
Answer: About three weeks. What name is given to animals which give birth to young ones? Answer: Viviparous animals. What name is given Cbse Class 8 Chapter 9 Science to animals which lay their eggs? Answer: Oviparous animals. Do you think metamorphosis takes place in humans? Answer: No, in humans the body parts similar to the adults are present from the time of the birth.
Define budding. Answer: Budding is the type of asexual reproduction in which new individuals develop from the buds. Name the method by which Amoeba reproduces. Answer: Amoeba reproduces by binary fission. All animals finally die, yet the species survives. Give reasons Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science for this. Answer: During the life span, all aniamls reproduce to produce offsprings.
So, even after they die, the species survives. Silkworm and frog undergo metamorphosis. It ensures the continuation of similar kinds of individuals, generation after generation. Differentiate between sexual and asexual reproduction. How many sperms are produced by the testis? What is the function of tail in sperms? Answer: Millions of sperms are produced by the testis. The sperms move in oviduct with the help Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science of tail.
What is the function of ovaries? In human beings, how many eggs are produced every month? Answer: Ovaries produce female gametes called ova. In human beings, a single mature egg is released every month.
If millions Cbse Class 8 Chapter 9 Science of sperms are transferred from the male to the female body, how many fuse with the egg? Answer: Only one sperm fuses with the egg. Draw a diagram to show fertilisation in humans. Differentiate between viviparous and oviparous Cbse Class 8 Chapter 9 Science animals.
How does the size of the egg varies in different animals? Answer: The egg is very small in humans, much larger in hens and the largest in ostrich. The different stages of the life cycle of mosquito and silkmoth are given below. Arrange them in proper sequence. What are hermaphrodite animals and plants? Answer: Organisms bearing both male and female sex organs on the same body are known as hermaphrodite animals.
Example, pea plant, earthworms. What Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science is fertilisation? Differentiate between external and internal fertilisation. Give two examples of each. This results in the formation of the fertilised egg or zygote. During the process of fertilisation, the new individual inherits some characteristics from the mother Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science and some from the father. Draw a labelled diagram to show the male reproductive system in human beings. Draw a labelled diagram to show the female reproductive system in human beings.
Explain how external fertilisation takes place in frogs. Answer: Cbse Class 8 Chapter 9 ScienceCbse Class 8 Chapter 9 Science strong> During rainy season, frogs and toads move to ponds. When the male and female come together in water, the female lays hundreds of eggs.
A layer of jelly holds the eggs together. The male deposits the sperms Cbse Class 8 Chapter 9 Science Science Cbse 9 Chapter Class 8 over them and fertilisation takes place. Why animals which undergo external fertilisation lay hundreds of eggs? Answer: These animals lay hundreds of eggs but all the eggs do not fertilise and develop into new individuals. The eggs get exposed Cbse Class 8 Chapter 9 Science to water movement, wind and rainfall. Other animals also feed on eggs. Thus, production of large number of eggs ensure fertilisation of at least few of them.
How does the embryo develop into the foetus? Answer: The embryo Cbse Class 8 Chapter 9 Science develops in the uterus. It gradually develops the body parts such as hands, legs, head, eyes, ears, etc. This stage of the embryo in which all the body parts are identifiable is called a foetus.
Is it possible to find out whether the foetus is healthy or not? Answer: Yes, it is possible to find out whether the foetus is healthy or not by using an ultrasound machine. Can the technique of ultrasound of foetus be misused? Answer: Cbse Class 8 Chapter 9 Science Yes, sometimes the technique of ultrasound can be misused. It can be used to identify the sex of the foetus which may lead to foeticide. Show the diagrammatic representation how Dolly was bom?
Name the process also. Give Cbse Class 8 Chapter 9 ScienceCbse Class 8 Chapter 9 Science ong> the names of the following processes. Indicate whether the following statements are True T or False F. The two methods of asexual reproduction are. Why does the child look like the parents?
Answer: The process of fertilisation Cbse Class 8 Chapter 9 Science 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. Draw diagram to show the formation of Cbse Class 8 Chapter 9 Science embryo from zygote. Explain the process of development of fertilised egg.
Answer: In hens, soon after fertilisation, the zygote divides repeatedly and travels down oviduct. As it travels down, many protective layers are formed around it. The hen Cbse Class 8 Chapter 9 Science finally lays the eggs. After about three weeks, the eggs are hatched.
Explain how cloning was done to produce Dolly. The cell thus produced was implanted in the womb of sheep A where it developes into a normal baby Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science sheep. Thus, Dolly was bom on 5th July Explain binary fission in Amoeba with the help of diagram. Then the cytoplasm also divides and each part gets one nucleus.
This is known as binary fission and it asexual Cbse Class 8 Chapter 9 Science reproduction. The diagrams is given showing reproduction in an organism. Observe the diagrams and answer the following questions. Yeast reproduces by a sexual reproduction b asexual reproduction c parthenogenesis d none of these. Answer: b. External fertilisation and Cbse Class 8 Chapter 9 Science external development takes place in a hen b frog c elephant d human beings Answer: b. Testes are found in a males only b females only c both males and females d none of these Answer: a.
When the Cbse Class 8 Chapter 9 Science embryo can be identified with body parts, it is known as a zygote b foetus c infant d egg Answer: b. Metamorphosis can be observed in a tadpole b earthworm c hen d Hydra Answer: a. Internal fertilisation Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science Cbse Class 8 Chapter 9 Science and internal development takes place in a hen b frogs c earthworm d elephants Answer: d. Breaking of the egg shell and the chick coming out is known as a hatching b incubation c fertilisation d metamorphosis Answer: a.



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