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These sets of questions contain all the extra questions of 10th Science Chapter 8. There are short answered questions, long answers questions and very short answers questions with answers.

We have covered the entire Chapter 8 of Class 10 Science through these practice questions. All the questions are confined to 10th Science Chapter 8. 10th ncert important questions 8 days sets of important questions provides a perfect practice for the preparation of school tests and 10th ncert important questions 8 days exams.

It contains very short, short and long questions with answers. For the perfect revision of 10th Science chapter 8these questions are helpful to all the students. UP Board students also use these questions for the revision of chapter for exams. The process of reproduction is necessary for preservation and increase in population of a species.

If the organism would not reproduce the species to which they belong would extinct once they are dead. In order to maintain the species an organism reproduces. Reproduction process is not necessary for an individual to live but necessary for perpetuation of its species. Reproduction process is not essential for an individual. But it is very necessary for the continuity of the species. Thus, this process preserves a species and maintains community of the race.

An offspring formed by a form of asexual reproduction or sexual reproduction involving fusion of gametes. In case of asexual reproduction, the offspring have subtle difference from their parents.

In sexually reproducing organisms these difference is more pronounced as a result of genetic combination during meiosis. The consistency of DNA replication during reproduction is important for the maintenance of body design features that allow an organism to use a particular ecological niche.

However, DNA replication is 10th ncert important questions 8 days full-proof. It results in subtle variation which may be harmful or beneficial to the individual according to the ecological niche it occupies.

The niches may also change any variation in an individual which makes it suitable for the niche would be beneficial for its survival. Variation is the basis of evolution. Method of asexual reproduction are: i Fission ii Budding iii Fragmentation iv Spore formation and v Vegetative propagation.

Fragmentation: The mode of reproduction of simple multicellular organization in 10th ncert important questions 8 days body is simple breaks up into smaller pieces upon maturity and each piece of fragment grows 10th ncert important questions 8 days a new individual is called fragmentation.

The relatively simple multicellular organism which are simply a random collection of cells are involved in fragment type of reproduction. Organism which reproduce by: a Budding: Hydra and Yeast.

The higher multicellular organism have differentiated structure and function unlike spirogyra in which all the cells are similar and independent units. In complex organisms, reproductive tissues are entrusted with reproduction. The male and female gametes combine to form a zygote which by cell division and differentiation forms the individual.

The zygote has all the genetic information to develop into a fully developed individual. Multicellular organisms cannot simply divide cell by cell because i Many multicellular organisms are not simply a random collection of cells. Specialised cells are organized as tissues and tissues are organized into organs which are placed at definite position in the body. In such a carefully organized situation cell division would be impracticable. Asexual Reproduction: The type of reproduction in which only single parent is involved to produce offsprings exactly similar to the parents.

In this type of reproduction, meiosis, gamete formation and gamete formation and gamete fusion does not take place. The cell division involved with asexual reproduction is mitosis.

The method involved in the in asexual reproduction: i Fusion ii Budding iii Fragmentation iv Spore formation v Vegetative propagation. Rhizopus has two types hyphae-one which procures food from the beads and another one is erect. The erect hyphae have a blob like structure called sporangia. Each nucleus present in the sporangia gets surrounded by a bit of cytoplasm to fore spore.

The spores are covered by thick walls. After maturation each sporangium ruptures to release a large number of spores. Advantage: The spores remain protected by thick walls until they 10th ncert important questions 8 days into contact of moist and appropriate condition to grow. Bryophyllum Advantages: i Many buds are produced in the notches along the margin of a single leaf.

Each leaf-bud of Bryophyllum produces a plant. Basic features: i Regeneration is carried out by specialized cells that proliferate and make large number of cells. Each spore contain a nucleus and cytoplasm enclosed in a thick wall for protection. Function: Spores disperse far and wide. Each spore grows into new Rhizopus when come in contact of moist surface and other suitable conditions.

Leishmania and Plasmodium reproduce by fission. Difference: Leishmania reproduce by binary fission that occurs in definite orientation in relation to whip 10th ncert important questions 8 days flagella, forming two cells: Plasmodium malaria parasite divides into many daughter cells simultaneously by multiple fission. Unicellular organism such as bacteria simply spilt into two equal halves during cell division to produce two new cell individuals.

Plasmodium divides into many daughter cells simultaneously. This proves that cell division is a type of reproduction in unicellular organisms. Bryophyllum leaves bear buds in their notches along their margin. When a leaf falls, the buds come in contact of the soil and develop into plantlets. These plantlets later grow into new plants. Budding: It is the process of formation of an offspring from an outgrowth or bud of a parent. The bud may be unicellular or multicellular depending upon the nature of the parent individual.

In coelenterates, tunicates and other multicellular animal bud consists of a small number of cells surrounded by an epithelium. In hydra it is usually formed in the lower half of the 10th ncert important questions 8 days. The buds separate from the parent soon after their formation or after some initial growth.

In many cases individuals develop from them do not separate but remain interconnected to form a colony. Animals multiply asexually by a number of methods like binary fusion, multiply fission, budding gemmules, fragmentation and spores or cysts.

After attaining an optimum size, the adult individual undergoes a simple division into two daughter cells of equal size. It consists of division of the nucleus followed by cleavage of cytoplasm into equal parts, each having a daughter nucleus.

Binary fission can occur in any place in Amoeba. It is longitudinal 10th ncert important questions 8 days Euglena and transverse in Paramoecium.

The organism undergoing binary fission are almost immortal since they never grow old but divide to form two young offspring after attaining the adult size.

The nucleus of the parent cell undergoes repeated division to produce a number of daughter nuclei. The cytoplasm cleaves around 10th ncert important questions 8 days nucleus simultaneously to form a number of daughter cells or individuals inside a parent cell. Ultimately under favourable conditions parent cell membrane ruptures and daughter individual are released. Sometime the daughter cell derived from a multiple fission develop resistant coverings to produce spores.

The process is called sporulation. In others the parent cell develops a cyst, wall around before undergoing multiple fission. Both the process is known in amoeba. As in binary fission, the parent individual disappears during the formation of daughters in multiple fission.

The splitting of the two cells during binary fission can take place in any plane. During binary fission of Amoeba nuclear division starts first followed by appearance of a constriction in the cell membrane. As the nuclear division completes, constriction deepen and divides into two parts, each containing one nucleus.

Finally, two independent daughter Amoeba are formed. Advantages of vegetative reproduction are i This is a very useful method 10th ncert important questions 8 days multiplying plants which do not produce seeds.

For example, lilies produce flowers within one or two years when grown vegetative. They produce flower in years when grown seeds.

To grow plants by cutting rather than from seeds is a method of artificial asexual reproduction. It has the following advantages: 1. It is the only method of reproduction in seedless plants.

We get a fully matured plants in a very short time. It is a short cut method for rapid multiplication. It helps to preserve the type of character that a plant breeder desires. It is very easy and economical method for the multiplication of ornamental plants. The modes of reproduction that depend on the involvement of two individuals before a new generation can be created is called sexual reproduction. A bud as in Hydra develops as an outgrowth due to repeated cell division at a specific site.

These buds when mature detach from the parent body and become new individual. In spore formation as in Rhizopus, a specific 10th ncert important questions 8 days called Sporangia that produce Spores. The spores are covered by thick walls that protect them until a spore gets favourable conditions to grow into a new plant. Variability in a race appears due to: i Recombination as a result of crossing over in meiosis.

In vegetative propagation the new plants are formed by somatic division of cells and they would be similar to parts of the parent plant formed during normal growth and development that also involve somatic divisions.

Conclusion:

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Characters that are transmitted from parents to offspring during reproduction show a only similarities with parents b only variations with parents c neither similarities nor variations d both similarities and variations with parents Ans. Which among the following diseases is not sexually transmitted? What is tubectomy? Removal of a section of fallopian tube. Name the causative organism, of AIDS?

HIV � Human Immunodeficiency virus. A common feature of reproduction in Amoeba, spirogyra and yeast is that � a They reproduce only sexually b They are all unicellular c they reproduce asexually d They are all multicellular Ans. They reproduce asexually. Which of this is seminal fluid? At the time of entering into ovule, pollen tube has a three male nuclei b two mole nuclei c one gamete nucleus d four male gametes Ans.

Two male nuclei. How many follicles mature every month during the reproductive phase of human female? One egg is produced every month by one of the ovaries.

Asexual reproduction takes place through budding in a Amoeba b Yeast c Plasmodium d Leishmania. Which of the following is not a part of female reproductive system in human beings? The anther contains a Sepals b Ovules c Carpel d Pollen grains. The simple animals such as planaria can be cut into number of pieces and each piece grows into a complex organism.

What is this process known as? Name the unicellular organism which caused the disease known as kala-azar. Which process taking place in the nucleus of a cell leads to variation in the offspring during reproduction? DNA copying. Which type of layering is done in Jasmine? Air Layering Gootee. Where does fertilization takes place in human female? Oviduct fallopian tube. Your email address will not be 10th Ncert Important Questions Job published.

Save my name, email, and website in this browser for the next time I comment. Two 6. Stigma They reproduce asexually A pair of duct arising from testis, which carry sperms are a fallopian tube b vas deferens c oviduct d urethra.

Question 4. Many unicellular organisms reproduce by the process of a fission b ovulation c regeneration d non-disjunction.

Question 5. When a sperm is deposited into the vagina which route does it travel? Question 6. At the time of entering into ovule, pollen tube has a three male nuclei b two male nuclei c one gamete nucleus d four male gametes.

Question 7. Which of this is seminal fluid? Question 8. When the foetus is growing inside the uterus it needs nutrients. Which part provides these nutrients? Question 9. The ability to reproduce is lost in a female after a fertilisation b menstruation c gamete formation d menopause. Question Which part of the flower forms the fruit? Anemophily is the pollination by: a Birds b Rain c insects d Wind.

Which is the most common method of reproduction in majority of fungi and bacteria? A common feature of reproduction in Amoeba, spirogyra and yeast is that: a Asexual reproduction occurs after sexual reproduction b Asexual reproduction occurs before sexual reproduction c Asexual reproduction does not involve gametes d Asexual reproduction involves only one parent.

There is a greater possibility for the evolution of a new species in organisms which reproduce by a binary fission b budding c fertilisation d regeneration.

The period during adolescence when the reproductive tissues begin to mature is called a ovyfetion b puberty c germination d propagation.

Anemophily is the pollination by � a Birds b Rain c insects d Wind. In man, fertilization of ovum takes place in a Vagina b ovary c uterus d Fallopian tubes. The flower of the Hibiscus plant is a bisexual b unisexual c neuter d very small. The seed that contains the future plant is called the a cotyledons b seed coat c germ cells d embryo. Spirogyra reproduce by a budding b fragmentation c regeneration d fission.

In vegetative reproduction, the new individuals are genetically � a Similar b Dissimilar c Abnormal d None of these. During favourable conditions, Amoeba reproduces by a multiple fission b binary fission c budding d fragmentation. The ability of a cell to divide into several cells during reproduction in Plasmodium is called a budding b multiple fission c binary fission d reduction division.

Assertion: Amoeba reproduced by fission Reason: All unicellular organisms reproduced by asexual method. Assertion: Ovary releases one egg every 10th Ncert Important Questions Queent month.

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