{"id":9184,"date":"2019-11-29T15:58:59","date_gmt":"2019-11-29T10:28:59","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=9184"},"modified":"2021-07-02T15:44:27","modified_gmt":"2021-07-02T10:14:27","slug":"2nd-puc-biology-question-bank-chapter-1","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/2nd-puc-biology-question-bank-chapter-1\/","title":{"rendered":"2nd PUC Biology Question Bank Chapter 1 Reproduction in Organisms"},"content":{"rendered":"

You can Download Chapter 1 Reproduction in Organisms Questions and Answers, 2nd PUC Biology Question Bank with Answers<\/a>, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations.<\/p>\n

Karnataka 2nd PUC Biology Question Bank Chapter 1 Reproduction in Organisms<\/h2>\n

2nd PUC Biology Reproduction in Organisms NCERT Text Book Questions and Answers<\/h3>\n

Question 1.
\nWhy is reproduction essential for organisms ?
\nAnswer:
\nReproduction enables the continuity of the species, generation after generation.<\/p>\n

Question 2.
\nWhich is better mode of reproduction: sexual or asexual? Why ?
\nAnswer:
\nSexual. It brings genetic variation and inherited during reproduction. It helps to create new species.<\/p>\n

Question 3.
\nWhy is the offspring formed by asexual reproduction referred to as clone ?
\nAnswer:<\/p>\n

    \n
  • The term clone is used to describe morphologically and genetically similar individuals. It doesn’t need the production of sex organs.<\/li>\n
  • In asexual reproduction also only one parent is involved for the production of individual. Newly formed individuals are genetically identical to the parent plant.<\/li>\n<\/ul>\n

    Question 4.
    \nOff springs formed due to sexual reproduction have better chances of survival. Why ? is this statement always true ?
    \nAnswer:
    \nYes. Because sexual reproduction brings changes in the genetic structure which leads to variation. This helps the organism to adjust or adapt according to the changes in the environment.<\/p>\n

    Question 5.
    \nHow does the progeny formed from asexual reproduction differ from those formed by asexual reproduction?
    \nAnswer:
    \nThe progeny formed from asexual reproduction remain identical to their parents but the offsprings produced by sexual reproduction shows variation due to genetic recombination.<\/p>\n

    \"KSEEB<\/p>\n

    Question 6.
    \nDistinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction?
    \nAnswer:<\/p>\n\n\n\n\n
    Asexual Reproduction<\/strong><\/td>\nSexual Reproduction<\/strong><\/td>\n<\/tr>\n
    1.\u00a0 Only single parent is involved for the production of new individuals.
    \n2. All divisions are mitotic.
    \n3. It doesn’t need production of sex organs.
    \n4. Newly formed individuals are identical to the parent.
    \n5.\u00a0\u00a0 It doesn’t produce variability.
    \n6.\u00a0\u00a0 It is rapid method of multiplication.<\/td>\n    		1. It involves two parents and offsprings arises from fusion of two gameteseach contributed by one parent.
    \n2.\u00a0 It undergoes meioses at one or other stage.
    \n3. It requires the production of sex organs.
    \n4.\u00a0 Newly formed individ\u00aduals show variations to their parents by new combination of
    \ncharacters.
    \n5. It produce variability.
    \n6.\u00a0 It is a slower method of multiplication.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Vegetative reproduction is also considered as a type of asexual reproduction because<\/p>\n

      \n
    • The plants are the exact genetic copies of the parent.<\/li>\n
    • It is also a rapid method of multiplication.<\/li>\n
    • It does not produce plants of new varieties
      \ni.e., no variability is produced.<\/li>\n<\/ul>\n

      Question 7.
      \nWhat is vegetative propagation ? Give 2 suitable examples.
      \nAnswer:
      \nIt is the process of multiplication where new plants develop from any portion of vegetative organs of plants without involving the seeds. It occurs in lower as well as higher plants. Example: In sweet potato, roots modified into tubes. In ginger and turmeric stem into rhizome.<\/p>\n

      Question 8.
      \nDefine
      \n(a) Juvenile phase
      \n(b) Reproductive phase
      \n(c) Senescent phase
      \nAnswer:
      \n(a) Juvenile phase: The period of growth is called the juvenile phase. It is known as vegetative phase in plants.
      \n(b) Reproductive phase: The phase during which the organisms are able to produce their offsprings.
      \n(c) Senescent phase: The period during which the organisms loss their ability to produce their offspring.<\/p>\n

      Question 9.
      \nHigher organisms have resorted to sexual reproduction inspite of its complexity. Why?
      \nAnswer:
      \nThe mode of reproduction helps to introduce now variation in progenies through the combination of the DNA from 2 different individuals. These variations allow the individual to cope up with various environmental conditions and thus make the organisms better suited for the environment.<\/p>\n

      Question 10.
      \nExplain why meioses and gametogenesis are always interlinked ?
      \nAnswer:
      \nGametogenesis is the process of the production of gametes. Gamates are haploid in nature produced from diploid gametic cells. Diploid cell undergoes meiotic division followed by mitotic division produces gametes.<\/p>\n

      Question 11.
      \nIdentify each part in a flowering plant and write whether it is haploid (n) or diploid (2n)
      \nAnswer:<\/p>\n

        \n
      • Ovary – 2n<\/li>\n
      • Anther – 2n<\/li>\n
      • Egg – n<\/li>\n
      • Pollen – n<\/li>\n
      • Male gamete – n<\/li>\n
      • Zygote – 2n<\/li>\n<\/ul>\n

        Question 12.
        \nDefine external fertilization. Mention its disadvantage ?
        \nAnswer:
        \nThe fertilization which involves the union of an egg with the sperm outside the body of the female is called external fertilization. It generally takes place in the medium of water. There is a chance of loss of male gamete during transport in water which leads to failure of external fertilization. Therefore the number of male gametes produced is several thousand times the number of female gametes produced.<\/p>\n

        \"KSEEB<\/p>\n

        Question 13.
        \nDifferentiate between a zoospore and a zygote.
        \nAnswer:<\/p>\n\n\n\n\n
        Zoospore<\/strong><\/td>\nZygote<\/strong><\/td>\n<\/tr>\n
        Zoospores are the asexual reproductive structures produced by fungi and simple plants like algae. They are motile. They are haploid in nature.<\/td>\nZygote is non motile produced by the fusion of male and female gamates. Zygote is deploid in nature.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Question 14.
        \nDifferentiate between gametogenesis and embryogenesis.
        \nAnswer:<\/p>\n\n\n\n\n
        Gametogenesis<\/strong><\/td>\nEmbryogenesis<\/strong><\/td>\n<\/tr>\n
        The process of formation of two types of gamates i.e., male and female gamates.<\/td>\nThe process of development of embryo from the zygote.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Question 15.
        \nDescribe the post fertilisation changes in a flower.
        \nAnswer:
        \nAfter fertilization the ovule converts into the seed and the whole ovary develops into a complete fruit. The petals and sepals dried and fall off. The fate of other parts is<\/p>\n

          \n
        • The ovary wall forms the pericarp of the fruit. It may become fleshy, juicy or dry.<\/li>\n
        • The integument of the ovule is converted into .seed coat. The outer integument forms the tesla and the inner into tegmen.<\/li>\n
        • Egg of the ovule divides meiotically and forms multicellular diploid embryo.<\/li>\n
        • Polar nuclei as a result of triple fusion from endosperm. It accumulates food and functions as a nutritive tissue for the developing embryo.<\/li>\n<\/ul>\n

          Question 16.
          \nWhat is a bisexual flower ? Collect 5 bisexual flowers from your neighbourhood . and write common and scientific names.
          \nAnswer:
          \nThe flower in which both reproductive organs i.e. stamen and pistil are present is called a bisexual flower.
          \nCommon name Scientific name<\/p>\n

            \n
          • Mango flower – Mangefera indica<\/li>\n
          • Coconut – Cocos nucifera<\/li>\n
          • Pea – Pisum salivum<\/li>\n
          • Hibiscus – Hibiscus Rosa – sinenses<\/li>\n
          • Rose – rosa mulliflora<\/li>\n
          • Mustard – Brassica nigra<\/li>\n<\/ul>\n

            Question 17.
            \nWhy are offsprings of oviparous animals at a great risk as compared to offspring of viviparous animals.
            \nAnswer:
            \nIn oviparous animals, the fertilized egg covered over by calcareous shell. After a period of enucleation the egg hatches out into young one i.e. out side the body of parent. But in viviparous animals, zygote develops into young one inside the body of female organism. After attaining the proper development young ones are delivered out of the body of the female organism. Because of getting proper embryonic care and protection, the chances of survival of young one is greater in viviparous animals.<\/p>\n

            Question 18.
            \nExamine a few flower of any cucurbit plant and try to identity the staminate and pistillate flowers. Do you know any other plant bears unisexual flowers.
            \nAns:
            \nOther unisexual plants are com, papaya, cucumber etc.<\/p>\n

            2nd PUC Biology Reproduction in Organisms Additional Questions and Answers<\/h3>\n

            2nd PUC Biology Reproduction in Organisms One Mark Questions\u00a0<\/strong><\/p>\n

            Question 1.
            \nDefine life span.
            \nAnswer:
            \nThe period from birth to the natural death of an organism is the life span of that organism.<\/p>\n

            Question 2.
            \nDefine the term reproduction.
            \nAns :
            \nIt is a biological process in which an organism gives rise to young ones similar to itself.<\/p>\n

            Question 3.
            \nWrite the significance of reproduction.
            \nAnswer:
            \nReproduction enables the continuity of the race, generation after generation.<\/p>\n

            Question 4.
            \nWhat is clone ?
            \nAnswer:
            \nMorphologically and genetically similar individuals produced by a single parent. In this young ones are exact copy of their parent.<\/p>\n

            Question 5.
            \nWhat is binary fission.
            \nAnswer:
            \nThe type of asexual reproduction occurs in single celled organisms. Where a cell divides into two halves and each rapidly grows into adult.<\/p>\n

            Question 6.
            \nName the type of reproduction occurs in yeast.
            \nAnswer:
            \nBud formation.<\/p>\n

            Question 7.
            \nName the asexual reproduction structures produced by fungi.
            \nAnswer:
            \nZoospore.<\/p>\n

            Question 8.
            \nName the asexual reproductive structure produced by penicillium and sponge.
            \nAnswer:<\/p>\n

              \n
            • Penicillium – conidia<\/li>\n
            • Sponge – Gemmules<\/li>\n<\/ul>\n

              Question 9.
              \nName the aquatic weed grow where there is standing water.
              \nAnswer:
              \nWater hyacinth<\/p>\n

              Question 10.
              \nWrite the disadvantage of growing water hyacinth in water.
              \nAnswer:
              \nIt drains oxygen from water, which leads to the death of fishes.<\/p>\n

              Question 11.
              \nWhat is oestrus cycle ?
              \nAnswer:
              \nIt is a heat period during which sexual desire of the female animal is at peak.<\/p>\n

              Question 12.
              \nWhat is menstrual cycle ?
              \nAnswer:
              \nRhythmic series of changes in the sex organs that occur after 28 days.<\/p>\n

              \"KSEEB<\/p>\n

              Question 13.
              \nGive the events occur in sexual reproduction.
              \nAnswer:
              \nPre-fertilization, fertilization and post fertilization events.<\/p>\n

              Question 14.
              \nWhich are the 2 main Pre-fertilization events ?
              \nAnswer:
              \nGametogenesis and gamete transfer.<\/p>\n

              Question 15.
              \nWhat are isogametes ?
              \nAnswer:
              \nThe male and female gametes of similar size (morphologically similar).<\/p>\n

              Question 16.
              \nWhat are heterogametes ?
              \nAnswer:
              \nMorphologically dissimilar gametes is sperm and ovum.<\/p>\n

              Question 17.
              \nWhat is homothallic or monoecious plant?
              \nAnswer:
              \nThe plant in which both the sex organs are in same flower.<\/p>\n

              Question 18.
              \nWhat is heterothallic or dioecious plant?
              \nAnswer:
              \nThe plant in which sex organs are in different flowers.<\/p>\n

              Question 19.
              \nDifferentiate between staminate and pistillate flower.
              \nAnswer:
              \nUnisexual male flower is staminate. Unisexual female flower is pistillate.<\/p>\n

              Question 20.
              \nWhat are hermaphrodite ?
              \nAnswer:
              \nThe animals in which both the sex organs are there in the same body are called hermaphrodites.<\/p>\n

              Question 21.
              \nName the type of division occur in meioeytes (gamete mother cells).
              \nAnswer:
              \nmeiotic division<\/p>\n

              Question 22.
              \nDefine Parthenogenesis.
              \nAnswer:
              \nDevelopment of an egg without the participation of sperm.<\/p>\n

              Question 23.
              \nDefine syngamy?
              \nAnswer:
              \nThe fusion of gametes which results the formation of zygote.<\/p>\n

              2nd PUC Biology Reproduction in Organisms Two Marks Questions<\/strong><\/p>\n

              Question 1.
              \nDifferentiate between staminate and pistillate flower. Give the term for this condition of flower.
              \nAnswer:<\/p>\n

                \n
              • The unisexual male flower is called staminate, which bears only stamen.<\/li>\n
              • The unisexual female flower is called pistillate, which bears only pistil.<\/li>\n
              • Heterothallic or dioecious are the terms used to describe this condition.<\/li>\n<\/ul>\n

                Question 2.
                \nExplain parthenogenesis with examples.
                \nAnswer:
                \nThe process of development of new organism from female gamete without fertilization is called parthenogenesis. Example, Rotifers, honey bees, turkey (birds).<\/p>\n

                \"KSEEB<\/p>\n

                Question 3.
                \nMeiosis doesn’t take place in haploid cells. Why?
                \nAnswer:
                \nIn haploid cells meiosis doesn’t takes place as there is no homologous chromosome. Therefore only mitotic division takes place.<\/p>\n

                Question 4.
                \nIn Ashes as well as amphibians where does syngamy occur. What type of fertilization occurs.
                \nAnswer:
                \nIn lower animals like fishes and amphibians syngamy occurs outside the body i.e., in water media. Therefore the type of fertilization is external fertilization.<\/p>\n

                2nd PUC Biology Reproduction in Organisms Three Marks Questions<\/strong><\/p>\n

                Question 1.
                \nWrite the disadvantages of external fertilization over internal fertilization.
                \nAnswer:<\/p>\n

                  \n
                • For external fertilization, the medium is required for the gamete transfer i.e. water.<\/li>\n
                • A large number of male gametes have to released in water medium to enhance the chances of syngamy.<\/li>\n
                • The offsprings are extremely vulnerable to predators threatening their survival up to adult hood.<\/li>\n<\/ul>\n

                   <\/p>\n","protected":false},"excerpt":{"rendered":"

                  You can Download Chapter 1 Reproduction in Organisms Questions and Answers, 2nd PUC Biology Question Bank with Answers, Karnataka State Board Solutions help you to revise complete Syllabus and score more marks in your examinations. Karnataka 2nd PUC Biology Question Bank Chapter 1 Reproduction in Organisms 2nd PUC Biology Reproduction in Organisms NCERT Text Book …<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[82],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/9184"}],"collection":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/comments?post=9184"}],"version-history":[{"count":0,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/posts\/9184\/revisions"}],"wp:attachment":[{"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/media?parent=9184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/categories?post=9184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kseebsolutions.guru\/wp-json\/wp\/v2\/tags?post=9184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}