{"id":27047,"date":"2020-06-24T14:25:46","date_gmt":"2020-06-24T08:55:46","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=27047"},"modified":"2021-07-02T15:19:15","modified_gmt":"2021-07-02T09:49:15","slug":"kseeb-class-10-science-important-questions-chapter-8","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/kseeb-class-10-science-important-questions-chapter-8\/","title":{"rendered":"KSEEB Class 10 Science Important Questions Chapter 8 How do Organisms Reproduce?"},"content":{"rendered":"

Students can download Class 10 Science Chapter 8 How do Organisms Reproduce?\u00a011 Human Eye and Colourful World\u00a0Important Questions,\u00a0KSEEB SSLC Class 10 Science Important Questions and Answers<\/a>\u00a0helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.<\/p>\n

Karnataka SSLC Class 10 Science Important Questions Chapter 8 How do Organisms Reproduce?<\/h2>\n

Question 1.
\nDefine reproduction.
\nAnswer:
\nThe biological process by which organisms produce young ones, which resemble themselves, is known as reproduction.<\/p>\n

\"KSEEB<\/p>\n

Question 2.
\nExplain the importance of reproduction in organisms.
\nAnswer:
\nReproduction is an important characteristic feature of living organisms. It is an essential life process, which not only helps in survival of the species but also helps in continuity of that race and group. Young ones replace the old and dying ones. These young ones feed, grow and reproduce again.<\/p>\n

Reproduction also helps in increasing the population of the species. Reproduction acts as a vehicle of organic evolution by transmitting advantageous variations to the offspring. In the absence of reproduction, species would perish and life on earth would be wiped out of existence.<\/p>\n

Question 3.
\nHow are the modes for reproduction different in unicellular and multicellular organisms?
\nAnswer:
\nUnicellular organisms generally reproduce asexually by fission, budding or spore formation. Their body has just one cell, which can easily multiply by simple cell division, budding or spore formation.<\/p>\n

Such methods are difficult in multicellular organisms as they have a complex organization of specialized tissues. Therefore, multicellular organisms usually reproduce by sexual method.<\/p>\n

Question 4.
\nHow does reproduction help in providing stability to populations of species?
\nAnswer:
\nPopulation of any species will remain stable when the birth rate is equal to the death rate. Reproduction produces new individuals, which will compensate for the deaths. Thus reproduction provides stability to population of a given species.<\/p>\n

Question 5.
\nIs reproduction essential for the survival of the individual?
\nAnswer:
\nNo, reproduction is not essential for the survival of the individual. An organism incapable of reproduction will also survive and complete its life cycle. However, reproduction is most essential for the growth in population and survival of the species. In the absence of reproduction, species will be wiped out of existence.<\/p>\n

Question 6.
\nWhy do organisms of the same species look similar?
\nAnswer:
\nReproducing organisms create new individuals similar to themselves. The individuals of the same species are the products that emerge from a common but similar blueprint. The DNA of the parents decides the blueprint. During reproduction, similar copies of the blueprint are produced by a process called DNA copying or DNA replication.<\/p>\n

Question 7.
\nWhat is variation? Why are hereditary variations important?
\nAnswer:
\nThe young ones of any species may resemble their parents broadly but differ from them in many ways. The differences in the characters among the offspring compared to their parents is called variation. Variation is necessary for organic evolution.<\/p>\n

\"KSEEB<\/p>\n

Question 8.
\nWhat is DNA? What is its structure called? Where is it located in the cell?
\nAnswer:
\nDNA stands for Deoxyribo Nucleic Acid. It is a macromolecule found in chromosomes of living beings and carries the genetic information of the organism. The structure of DNA is called \u2018double helix\u2019 structure.<\/p>\n

Every eukaryotic cell has a nucleus, which contains chromosomes. These chromosomes carry information for the inheritance of characteristics from the parents to their offspring in the form of DNA molecules.<\/p>\n

Question 9.
\nWhat is meant by DNA copying? What is its importance?
\nAnswer:
\nThe process of producing two identical copies of one original DNA molecule is called DNA copying. It is also called DNA replication. DNA replication is important because replication is needed during cell division. Replication allows the cell to be duplicated so that it can continue the process of cell division.<\/p>\n

DNA copying enables organisms to beget young ones similar to their own kind. The process of DNA copying brings some variation each time. The surviving cells are similar to but subtly different from each other. This inbuilt tendency for variation during reproduction brings variations among individuals of the same species. This is useful for ensuring survival of the species.<\/p>\n

Question 10.
\nWhy is DNA copying an essential part of the process of reproduction?<\/p>\n

OR<\/p>\n

What is the importance of DNA copying in reproduction?<\/p>\n

Answer:
\nThe process of reproduction produces offspring similar to the parents. The exact blueprint of the body is inherited by the offspring due to DNA copying in the parent cell. This is why DNA copying is an essential part of reproduction.<\/p>\n

Question 11.
\nBriefly describe the process of DNA copying.
\nAnswer:
\nThe replication of DNA occurs in every cell during cell division. The process requires the uncoiling of the two strands of the DNA helix. The two open strands serve as templates for the assembly of daughter strands. The assembly of new strands takes place in a complimentary mode.<\/p>\n

This process is accompanied by the creation of an additional cellular apparatus. Then, the two DNA copies separate out each having its own cellular apparatus. Effectively, a cell divides to give rise to two cells.<\/p>\n

Question 12.
\nWhy is variation beneficial to the species but not necessarily for the individual?
\nAnswer:
\nPopulations of organisms reside in well-defined places or niches in the ecosystem. However, habitats or niches can change because of reasons beyond the control of the organisms. Variations allow organisms to exist in diverse habitats or niches. In the absence of variations, a species may be restricted to a particular area.<\/p>\n

If this area gets drastically altered, due to various natural or human-made causes, the species may be wiped out. However, if some variations were present in a few individuals, they could colonize other habitats, reproduce and could survive. But if variations were present in a single organism there would be very little chance for it to survive. Therefore, variation is beneficial to the species but not necessarily for the individual.<\/p>\n

Question 13.
\nMention the major modes of reproduction seen in animals.
\nAnswer:
\nReproduction in animals takes place principally by two modes. They are asexual reproduction and sexual reproduction.<\/p>\n

Question 14.
\nWhat is asexual reproduction?
\nAnswer:
\nA type of reproduction in which the young one arises from a single parent and is genetically identical to the parent is called asexual reproduction. This process does not involve the fusion of gametes.<\/p>\n

Question 15.
\nGive examples of animals that reproduce by asexual method.
\nAnswer:
\nLower order organisms like amoeba, yeast and hydra reproduce by asexual method.<\/p>\n

Question 16.
\nWhat is the method of reproduction in amoeba?
\nAnswer:
\nAmoeba is a unicellular organism. It reproduces asexually by the method of binary fission.<\/p>\n

\"KSEEB<\/p>\n

Question 17.
\nWhat is binary fission in reproduction? Name an organism that reproduces by this method.
\nAnswer:
\nA kind of asexual reproduction in which a unicellular parent cell divides itself into two daughter cells is known as binary fission. Amoeba reproduces by binary fission.<\/p>\n

question 18.
\nExplain the process of reproduction in amoeba.
\nAnswer:
\n\"KSEEB
\nAmoeba is a unicellular eukaryotic organism. Its body is made of a single cell. It reproduces asexually by the method of binary fission. The adult amoeba becomes ready for binary fission. First the nucleus divides into two. A constriction develops dividing the cytoplasm into two parts.<\/p>\n

The parent cell breaks at the point of constriction resulting in two daughter amoebae, which are identical to that of the parent. This is a form of asexual reproduction called binary fission.<\/p>\n

Question 19.
\nWhat is multiple fission in reproduction? When does amoeba reproduce by multiple fission?
\nAnswer:
\nA type of asexual reproduction in which a unicellular organism divides itself into three or more daughter cells that are identical to the parent organism is called multiple fission. Amoeba reproduces by the method of multiple fission under unfavourable or drought conditions to increase the chances of survival of daughter cells.<\/p>\n

Question 20.
\nHow does binary fission differ from multiple fission?
\nAnswer:
\nBinary fission is a mode of asexual reproduction in which a unicellular parent organism divides itself into two daughter organisms through the process of cell division. This method produces two young ones. This happens under favourable conditions in the absence of any stress.<\/p>\n

Multiple fission is a mode of asexual reproduction in which a unicellular parent organism undergoes cell division to produce more than two (many) young ones. This type of reproduction occurs under unfavourable or stressful conditions.<\/p>\n

Question 21.
\nExplain binary fission in Leishmania.
\nAnswer:
\nIn Leishmania, binary fission occurs in a definite orientation in relation to flagella. Splitting of parent cell during fission takes place in a definite plane (longitudinally) with respect to flagellum at its ends.
\n\"KSEEB<\/p>\n

Question 22.
\nName the disease caused-by Leishmania.
\nAnswer:
\nThe disease kala-azar is caused by Leishmania.<\/p>\n

Question 23.
\nWhat is the difference between binary fission in amoeba and leishmania?
\nAnswer:
\nIn amoeba, the splitting of the two cells during division can take place in any plane. Binary fission in Leishmania happens in a longitudinal plane.<\/p>\n

Question 24.
\nWhat is the mode of reproduction in yeast? Explain briefly.
\nAnswer:
\nYeast reproduces asexually by a process known as budding. The parent yeast cell forms a small bud on its own body, which eventually develops into a new individual. On maturity, the bud breaks away from the parent body and gets independent existence.<\/p>\n

Question 25.
\nDescribe a simple activity to show the reproduction in yeast cells.
\nAnswer:
\nYeasts reproduce asexually by budding. This can be observed under a powerful microscope. Dissolve about 10 g of sugar in 100 mL of water. Take 20 mL of this solution in a test tube and add a pinch of yeast granules to it. Put a cotton plug on the mouth of the test tube and keep it in a warm place.<\/p>\n

After 1 or 2 hours, put a small drop of yeast culture from the test tube on a slide and cover it with a cover slip. Observe the slide under a microscope. Now we see many yeast cells and some of them show budding on the outside wall of their cell wall.<\/p>\n

Question 26.
\nHow do fungi reproduce?
\nAnswer:
\nFungi reproduce asexually by the method of spore formation. Spore formation is a method of asexual reproduction in which the parent plant produces hundreds of tiny spores, which can grow into new organisms under favourable conditions.<\/p>\n

Question 27.
\nDescribe how growth of fungus on a piece of moist slice of bread takes place.
\nAnswer:
\nTake a slice of moistened bread. Keep it on a plate in a cool, moist and dark place. Observe the surface of the slice with a magnifying glass for over a week. A white cottony mass appears on the surface of the bread which gradually turns black. This is due to the growth of bread mould (a fungus). The spores of fungus will always be hanging in air.<\/p>\n

They settle on the moist bread which provides favourable conditions for their germination. The cottony growth on the bread is a mass of vegetative filaments of the fungus. These filaments develop asexual sporangia which are black in colour. This is why the cottony mass turns black after a couple of days.<\/p>\n

Question 28.
\nHow will an organism be benefited if it reproduces through spores?
\nAnswer:
\nThe following are some benefits for the organism that reproduces through spore formation:<\/p>\n