{"id":5084,"date":"2020-08-30T10:14:51","date_gmt":"2020-08-30T04:44:51","guid":{"rendered":"https:\/\/kseebsolutions.guru\/?p=5084"},"modified":"2021-07-02T15:04:05","modified_gmt":"2021-07-02T09:34:05","slug":"kseeb-solutions-class-8-science-chapter-19","status":"publish","type":"post","link":"https:\/\/kseebsolutions.guru\/kseeb-solutions-class-8-science-chapter-19\/","title":{"rendered":"KSEEB Solutions for Class 8 Science Chapter 19 Nutrition and Respiration"},"content":{"rendered":"

Karnataka Board Class 8 Science Chapter 19 Nutrition and Respiration<\/h2>\n

KSEEB Class 8 Science Chapter 19 Textual Questions & Answers<\/h3>\n

I. Four alternatives are given to each of the following incomplete statement\/ question. Choose the right answer.<\/p>\n

Question 1.
\nThe process of obtaining food and utilizing it in the body is ……………
\n(a) respiration
\n(b) nutrition
\n(c) excretion
\n(d) reproduction.
\nAnswer:
\n(b) nutrition<\/p>\n

Question 2.
\nOne of these is a product of photosynthesis …………….
\n(a) Starch
\n(b) glucose
\n(c) Maltose
\n(d) sucrose.
\nAnswer:
\n(a) Starch<\/p>\n

Question 3.
\nInsectivorous plants commonly grow in areas where soil is deficient in
\n(a) carbon
\n(b) nitrogen
\n(c) potassium
\n(d) phosphorus.
\nAnswer:
\n(b) nitrogen<\/p>\n

Question 4.
\nA person applies hydrogen peroxide on his wound This is to kill
\na) anaerobic bacteria
\nb) aerobic bacteria
\nc) fungi
\nd) protozoa.
\nAnswer:
\nc) fungi<\/p>\n

Question 5.
\nAmylase Converts Starch to
\n(a) glucose
\n(b) Sucrose
\n(c) lactose
\n(d) maltose
\nAnswer:
\n(d) maltose<\/p>\n

II. Answer the Following.<\/p>\n

Question 1.
\nWhat are life processes?
\nAnswer:
\nThe processes such as respiration, nutrition, growth, movement, response to stimuli, excretion and reproduction that help to support and sustain life are called as life processes.<\/p>\n

Question 2.
\nExplain the method of testing a leaf for starch.
\nAnswer:
\nCollect a Few leaves From a plant put it in water For Some time and the take out, It is then dipped in spirit and then in Iodine Solution. Observe that the leaf turns blue-black Showing the presence of Starch.<\/p>\n

Question 3.
\nExplain an experiment to demonstrate that oxygen is released during photosynthesis.
\nAnswer:
\n\"KSEEB<\/p>\n

Take two troughs Filled with water Add a few Crystals of Sodium bicarbonate to both. Place Hydrilla plants in both the troughs and invert large Funnels over them Take two test tubes, place Small pieces of Steel wool into their bottoms.<\/p>\n

Fill the test tubes with water and invert them over the narrow ends of each of the Funnel, place one of the troughs in a bright Sunny area Whereas the other trough in dark Cupboard For about by introduced Splinters.<\/p>\n

The Splinter burns brightly in the gas collected in the test tube which is kept outside, but not which is kept in the Cupboard. From this experiment, we can show that the gas released during photosynthesis is oxygen.<\/p>\n

Question 4.
\nDifferentiate between the two phases of photosynthesis
\nAnswer:<\/p>\n\n\n\n\n\n
Light reaction<\/td>\nDark reaction<\/td>\n<\/tr>\n
1. Light reaction takes place in the presence of sunlight.<\/td>\n1. Dark reaction takes place in the absence of sunlight (night)<\/td>\n<\/tr>\n
2. It takes place in the grana region<\/td>\n2. It takes place in the stroma region<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 5.
\nWhat are parasites? Give two examples.
\nAnswer:
\nThe organism which obtains Food from other organism is called a parasite. There are two types of parasites.<\/p>\n

    \n
  1. Semi parasite
    \nEg: Viscum<\/li>\n
  2. Total parasite
    \nEg: Cuscuta, intestinal worms like tapeworm, roundworm, etc.<\/li>\n<\/ol>\n

    Question 6.
    \nAmoeba Cannot digest Fats Why?
    \nAnswer:
    \nAmoeba has no enzyme to digest Fats Therefore amoeba Cannot digest Fats.<\/p>\n

    Question 7.
    \nExplain the respiration in the cockroach.
    \nAnswer:
    \nThe tracheal system of a cockroach includes stigmata, Trachea, and Tracheoles. Stigmata are the respiratory openings in a cockroach. These are present on the lateral sides of the body. Trachea and Tracheoles carry oxygen from the diffused air to all parts of the body.<\/p>\n

    Cells take in oxygen and give out carbon dioxide to the tracheole. Haemolymph the blood of cockroach is involved in the gaseous exchange. between the cells, The carbon dioxide is diffused out through the spiracle openings.<\/p>\n

    Question 8.
    \nExplain respiration in human beings.
    \nAnswer:
    \nAir enters into the nasal cavity through the nostrils. Dust particles present in the air are prevented from entering the lungs. Air passes to the pharynx and then into the trachea. It has \u2018C\u2019 shaped rings which prevent it from collapsing.<\/p>\n

    The trachea is divided into bronchi and into bronchioles and a number of alveoli. Blood circulating around the alveoli gives out CO2<\/sub>. This oxygenated blood reaches the cells and gives oxygen to the cells and is used for oxidizing glucose. CO2<\/sub> formed as a product is carried by the blood to the alveoli and exhaled along the same pathway.<\/p>\n

    Question 9.
    \nDraw a diagram of the human digestive system label the parts.
    \nAnswer:
    \n\"KSEEB<\/p>\n

    KSEEB Class 8 Science Chapter 19 Additional Questions & Answers<\/h3>\n

    Question 1.
    \nWhat are autotrophs?
    \nAnswer:
    \nThe organisms which prepare their own food are called autotrophs.
    \nExample: Green plants<\/p>\n

    Question 2.
    \nWhat is photosynthesis?
    \nAnswer:
    \nThe process by which the green plants manufacture Organic Compound by using CO2 <\/sub>and H2<\/sub>O in the presence of sunlight and Chlorophyll.<\/p>\n

    Question 3.
    \nWhat are Stomata?
    \nAnswer:
    \nThe minute Opening on the leaf Surface is called Stomata.<\/p>\n

    Question 4.
    \nDraw a neat diagram of the cross-section of the leaf.
    \nAnswer:
    \n\"KSEEB<\/p>\n

    Question 5.
    \nMention the two phases of photosynthesis
    \nAnswer:
    \nThe two phases of photosynthesis are<\/p>\n

      \n
    1. Light reaction<\/li>\n
    2. Dark reaction (Light independent reaction)<\/li>\n<\/ol>\n

      Question 6.
      \nDraw a neat labelled diagram of Chloroplast
      \nAnswer:
      \n\"KSEEB<\/p>\n

      Question 7.
      \nWhat arc insectivorous plants? Give example.
      \nAnswer:
      \nphoto Synthetic plants which are growing in the soil, poor in nitrogen content try to obtain nitrogen by trapping and digesting insects are Called insectivorous plants.
      \nExample: Rosecrans, Nepenthes.<\/p>\n

      Question 8.
      \nWhat are epiphytes? Give example.
      \nAnswer:
      \nSome plants Capable of photosynthesis take shelter in the host tree Such plants are Called epiphytes
      \nExample: Orchids.<\/p>\n

      Question 9.
      \nWhat are Saprophytes? Give example.
      \nAnswer:
      \nThe organism which obtains Food From dead and decaying organic matter by decomposing the Same is Called as Saprophytes
      \nExample: bacteria, Fungi<\/p>\n

      Question 10.
      \nWhat is the benefit of E-Coli bacteria in a man?
      \nAnswer:
      \nE – Coli bacteria present in the intestine of man provide the Vital B – Complex Vitamins.<\/p>\n

      Question 11.
      \nDefine the term Symbiosis\/ mutual-ism.
      \nAnswer:
      \nThe mode of nutrition in which two organisms live together and are mutually benefited is called mutual-ism or Symbiosis.<\/p>\n

      Question 12.
      \nMention the steps involved in Horologic nutrition.
      \nAnswer:
      \nThe Horologic nutrition involves Five steps namely<\/p>\n

        \n
      1. ingestion<\/li>\n
      2. digestion<\/li>\n
      3. absorption<\/li>\n
      4. assimilation and<\/li>\n
      5. egestion.<\/li>\n<\/ol>\n

        Question 13.
        \nDefine the following terms.<\/p>\n

          \n
        1. Ingestion<\/li>\n
        2. \u00a0Digestion<\/li>\n
        3. \u00a0Absorption<\/li>\n
        4. Assimilation<\/li>\n
        5. Egestion.<\/li>\n<\/ol>\n

          Answer:<\/p>\n

            \n
          1. Ingestion: The process of taking the Food is called ingestion.<\/li>\n
          2. Digestion: Conversion of Complex larger molecules into simple smaller molecules by the action of enzymes for easy absorption is called digestion.<\/li>\n
          3. Absorption: Taking in of Soluble digested nutrients into the blood is called absorption.<\/li>\n
          4. Assimilation: The process of converting the digested food into protoplasm I.e storing or utilizing in the ells is called assimilation.<\/li>\n
          5. Egestion: Elimination of undigested Food From the animal body is called egestion.<\/li>\n<\/ol>\n

            Question 14.
            \nExplain the nutrition in Amoeba.
            \nAnswer:
            \nAmoeba feeds on bacteria, diatoms, unicellular algae, minute protozoa, and even dead organic matter The pseudopodia help in surrounding and ingesting the prey into Food vacuole Digestive enzymes amylase and pro-tease Secreted in the Food Vacuole digest the carbohydrates and proteins respectively into Simple Forms.<\/p>\n

            The digested Food is diffused into the cytoplasm and circulates so that all the parts of the receives the nutrients, It is used For all the life activities. The undigested Food is egested with the help of pseudopodia.<\/p>\n

            Question 15.
            \nWhat are antennae? Write its Functions.
            \nAnswer:
            \nThe pair of Feelers in the head region of Cockroach is called antennae. It senses the Food and pushes the Food into the mouth.<\/p>\n

            Question 16.
            \nDraw a neat labeled diagram to show the digestive System of Cockroach
            \nAnswer:
            \n\"KSEEB<\/p>\n

            Question 17.
            \nName the parts of alimentary canal of man.
            \nAnswer:
            \nThe alimentary Canal in eludes the mouth pharynx esophagus stomach Small intestine, large intestine and anus.<\/p>\n

            Question 18.
            \nMention the acid present in the gastric juice Mention its Function.
            \nAnswer:
            \nThe gastric juice contains hydrochloric acid, It kills the microbes that enters in to the stomach through Food and water.<\/p>\n

            Question 19.
            \nName the enzymes present in gastric juice and mention its Function.
            \nAnswer:
            \nEnzymes present in gastric Juice are<\/p>\n

              \n
            1. pepsin : convert proteins in to polypeptides<\/li>\n
            2. Rennin : converts the soluble milk proteins insoluble curds.<\/li>\n<\/ol>\n

              Question 20.
              \nMention the juice produced by the liver and where is, it stored?
              \nAnswer:
              \nBile juice is produced by the liver and it is stored in the gall bladder. Bile juice emulsifies Fats.<\/p>\n

              Question 21.
              \nMention the enzymes present in pancreatic juice mention its Function.
              \nAnswer:
              \nThe pancreatic juice contains two enzymes are<\/p>\n

                \n
              1. Amylase:\u00a0 diverts Starch into maltose<\/li>\n
              2. Lipase: Converts fats into simple fats<\/li>\n<\/ol>\n

                Question 22.
                \nMention the enzymes present in intestinal juice, mention its Functions.
                \nAnswer:<\/p>\n

                  \n
                1. Enzymes present in intestinal juice are Maltose – Converts Maltose into glucose.<\/li>\n
                2. Sucrose – Converts Cane sugar into glucose<\/li>\n
                3. Lactate – Converts Milk sugar into glucose<\/li>\n
                4. Peptidase – Converts Peptidase into amino acids<\/li>\n
                5. Lipase – converts Fats into fatty acids and glycerol<\/li>\n<\/ol>\n

                  Question 23.
                  \nWhat are villi?
                  \nAnswer:
                  \nThe Finger-like projection of the Small intestine which absorbs the digested Food are called villi<\/p>\n

                  Question 24.
                  \nWhat is respiration? Name the two types of Respiration.
                  \nAnswer:
                  \nRespiration is a process by which energy is liberated by oxidation of Food.<\/p>\n

                    \n
                  1. Aerobic respiration<\/li>\n
                  2. Anaerobic respiration<\/li>\n<\/ol>\n

                    Question 25.
                    \nDifferentiate between aerobic and anaerobic respiration.
                    \nAnswer:<\/p>\n

                      \n
                    1. Aerobic respiration:\n