Choose the set that has an incorrect combination. This is because it has parts of both male and female reproductive. Sperm is the male gamete while oviduct, egg and uterus are parts of female reproductive. The embryo gets embedded in cbse exemplar class 8 science wall of the uterus for development by implantation. 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 cbse exemplar class 8 science Answer.
The rest three human being, cow and dog are viviparous, i. Pick the appropriate reason from the following. Since, the gametes are laid in water, many of them are carried away by moving water, wind or rain and many are eaten by other animals. Therefore, production of large number of gametes is necessary.
The other cbse exemplar class 8 science Amoeba, Paramecium and bacteria reproduce asexually by binary fission. The sperms then pass through the uterus and reach to oviducts. It is here, that sperm combines with egg to form zygote i. The embryo moves down from oviduct into the uterus, where it gets embedded. This is called implantation. They lay eggs and release sperms outside body in the water for fertilisation to take place.
The young one top is formed outside the body in water from the zygote formed cbse exemplar class 8 science eggs. It is the beginning of formation of a new individual. All the multicellular animals start their life from a single cell called zygote. The fusion of gametes is called fertilisation. The fusion forms a zygote, which divides repeatedly to form the embryo.
The embryo gets implanted in female uterus for further development to form foetus. During fertilisation, only the nuclei of male and female gametes fuse. The sperm reaches to egg and only its nucleus enters the egg cell and fuses with the egg nucleus to form the single-celled structure called zygote.
The cell formed consists of only one nucleus but is diploid in nature. Write them in sequential order. Pupa, Egg, Silk moth, Caterpillar Answer.
The stages in the life cycle of silkworm occurs in following sequence: This process of transformation from an immature form of an animal to its adult form in two or more distinct stages is called metamorphosis.
Reproduction is important for organisms because it ensures the continuity of life on earth. It is the means of multiplication and perpetuation of a species. Cbse exemplar class 8 science also creates variations among the population. Birds are oviparous, i. So, it is easy to collect their eggs and these are thus available in market. On the contrary, dogs are viviparous, i. Their eggs are extremely small which remain inside their bodies.
This jelly or gelatinous covering also protects them Ncert Exemplar Solutions Class 10th Science from drying up and prevents them from being eaten up by other animals or predators. It reproduces by����� reproduction. The process of reproduction begins by the division of its����. This is followed by the division of its ����� into two. This type of reproduction is called����� fission. Single,asexual, nucleus, body, binary.
On the cbse exemplar class 8 science, Syllabus Of Science Class 8 Cbse 2019-20 in metamorphosis, the parts of the adult are different from those at the time of birth. How is this possible? Although, mother gives birth to a baby but the baby cbse exemplar class 8 science formed from the fertilisation of male and female gamete that comes from the father and mother, respectively.
The nuclei of both the parent gametes fuse to form a zygote with new character combinations from both parents. Hence, the zygote formed from fertilisation have characters of both the parents. This zygote develops inside the female body uterus and finally takes birth as baby.
Both Hydra and Amoeba reproduce asexually involving only single parent but the mode of reproduction is different. External fertilisation can occur both in water and on land. The eggs of fish are covered by hard shells for protection.
Human egg has a head, middle piece and tail. In adult human females, a single mature egg is released into an oviduct every month. False, external fertilisation occurs only in water and not on land. False, the eggs of fish are covered by gelatinous or jelly-like covering for protection.
False, human sperm has a head, middle piece and tail. Male gametes or sperms have tail to facilitate movement of sperms and help them to reach the egg female cbse exemplar class 8 science for fertilisation.
The single-celled parent Amoeba divides to form two daughter cells that develop into two independent Amoebae. Female fish lay eggs in water while male fish releases its sperms in water. Sperms swim and reach the eggs of fish, randomly due to water currents. When a sperm comes in contact with the viable egg, nuclei of both the cell fuses to form a zygote.
This process of fertilisation takes place in water outside the female body, hence fertilisation is external in fishes. The part which produces female gametes. The part where development of the baby takes place. The part through which the developing embryo passes to reach the uterus. It divides and differentiates into three germ layers which cbse exemplar class 8 science rise to different body : parts such as hands, legs, head, eyes, ears.
This stage where all the cbse exemplar class 8 science parts are distinct and easily identified in developing embryo is called foetus. A human embryo Class 10th Ncert Exemplar Science Course becomes a foetus after about 8 weeks of pregnancy.
After completion of development of foetus i. Hens are oviparous in which internal fertilisation takes place. The fertilised egg divides repeatedly to form an embryo inside the body. The embryo cbse exemplar class 8 science, travels down the oviduct with many protective layers forming around it.
After the hard egg shell is formed around the developing embryo, the hen lays the eggs outside. After about 3 weeks, the development of chick from egg takes place. On the contrary, frogs are oviparous in which external fertilisation occurs. Cbse exemplar class 8 science frogs lay eggs and sperms in water, which comes in contact to undergo fertilisation.
The fertilised eggs are covered by a jelly for protection. The development of embryo takes place in the egg in water, i. The figures showing stages during development of embryo are identified as a Embedding of the embryo in the uterus implantation. The above stages in sequence are: 3. Development of embryo The embryo after being implanted in uterus, continues to develop and cbse exemplar class 8 science and differentiate into body parts.
The stage of embryo when body parts become distinct and identified is called foetus. After complete development of foetus, mother gives birth to baby. Short Answer Type Questions Question. Single,asexual, nucleus, body, binary Question. True Question. Long Answer Type Questions Question. RD Sharma Class 12 Solutions. Watch Youtube Videos.
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