{"id":2626,"date":"2021-02-08T19:14:46","date_gmt":"2021-02-08T13:44:46","guid":{"rendered":"https:\/\/apboardsolutions.guru\/?p=2626"},"modified":"2021-09-15T12:09:23","modified_gmt":"2021-09-15T06:39:23","slug":"ap-board-9th-class-biology-important-questions-chapter-4","status":"publish","type":"post","link":"https:\/\/apboardsolutions.guru\/ap-board-9th-class-biology-important-questions-chapter-4\/","title":{"rendered":"AP Board 9th Class Biology Important Questions Chapter 4 Movement of Materials Across the Cell Membrane"},"content":{"rendered":"

AP State Syllabus AP Board 9th Class Biology Important Questions<\/a> Chapter 4 Movement of Materials Across the Cell Membrane.<\/p>\n

AP State Syllabus 9th Class Biology Important Questions 4th Lesson Movement of Materials Across the Cell Membrane<\/h2>\n

9th Class Biology 4th Lesson Movement of Materials Across the Cell Membrane 1 Mark Important Questions and Answers<\/h3>\n

Question 1.
\nWhat is exosmosis?
\nAnswer:
\nThe process in which water molecules leave the cell is called exosmosis.<\/p>\n

Question 2.
\nWhat is endosmosis?
\nAnswer:
\nThe process in which water molecules enter the cell is called endosmosis.<\/p>\n

\"AP<\/p>\n

Question 3.
\nWho are the scientists that removed salt from sea water and how?
\nAnswer:
\nFreddie Mercury and David Bowie removed salt from sea water by using a semi permeable membrane by a process called desalination.<\/p>\n

Question 4.
\nWhat happens if red blood cells are placed in distilled water?
\nAnswer:
\nThe red blood cells placed in hypotonic solution like distilled water the cells swell and burst.<\/p>\n

Question 5.
\nWhat is the better food during a journey?
\nAnswer:
\nThe natural fruits with 80% to 90% water in them, not only quench our thirst but also reduce our hunger.<\/p>\n

Question 6.
\nWhat is a saturated solution?
\nAnswer:
\nThe solution that cannot takeup more solute to dissolve is called a saturated solution.<\/p>\n

Question 7.
\nName the principle involved in dialysis and reverse osmosis.
\nAnswer:
\nOsmosis<\/p>\n

Question 8.
\nName the principle involved in air freshners, mosquito repellents that are used in our daily life.
\nAnswer:
\nDiffusion.<\/p>\n

\"AP<\/p>\n

Question 9.
\nWhat is a hypotonic solution?
\nAnswer:
\nIf the medium surrounding the cells has a higher water concentration than the cell, the cell will gain water by osmosis. Such type of solution is called hypotonic solution.<\/p>\n

Question 10.
\nWhat is isotonic solution?
\nAnswer:
\nIf the medium has exactly the same concentration as the cell there will be no net movement of water across the cell membrane. Such solution is called isotonic solution.<\/p>\n

Question 11.
\nWhat is hypertonic solution?
\nAnswer:
\nIf the medium has a lower water concentration, then the cell will loose water by osmosis. Such a solution is called hypertonic solution.<\/p>\n

Question 12.
\nWhat is plasmolysis?
\nAnswer:
\nWhen a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.<\/p>\n

Question 13.
\nHow do substances like CO2<\/sub> and water move in and out of the cell?
\nAnswer:
\nCO2<\/sub> moves by diffusion and water moves by osmosis through cell membrane.<\/p>\n

Question 14.
\nWhat will happen to the size of the cell if it is placed in hypotonic solution?
\nAnswer:
\nWhen the cell is placed in hypotonic solution, water enters into the cell. Hence, the cell swell up.<\/p>\n

Question 15.
\nWhat will happen to the size of the cell if it is placed in hypertonic solution?
\nAnswer:
\nWater leaves from the cell when we keep the cell in the hypertonic solution. Hence the swell will shrink.<\/p>\n

Question 16.
\nWhy does the skin of your finger shrinks when you wash your clothes for a long time?
\nAnswer:
\nA soap solution is a hypertonic solution. So, water moves out of your fingers by osmosis.<\/p>\n

Question 17.
\nA person takes concentrated solution of salt. After sometime, he starts vomiting. What is the phenomenon responsible for such solution?
\nAnswer:
\nExosmosis in intestine causes dehydration.<\/p>\n

\"AP<\/p>\n

Question 18.
\nWhen you are cooking vegetables generally you add salt to vegetables during cooking. After adding salt, vegetables release water. What mechanism is responsible for this?
\nAnswer:
\nExosmosis is responsible for the above mechanism.<\/p>\n

9th Class Biology 4th Lesson Movement of Materials Across the Cell Membrane 2 Marks Important Questions and Answers<\/h3>\n

Question 1.
\nWhat is reverse osmosis ? What are its applications?
\nAnswer:
\n1) When heavy pressure is applied on salt solution which is separated from fresh water with semipermeable membrane, the water moves from salt solution into fresh water leaving the salt behind.
\n2) This process is known as reverse osmosis.<\/p>\n

Application :
\nHome reverse osmosis machines are available in the market, which filter salt water through three membranes.<\/p>\n

Question 2.
\nWhat is diffusion? Give example.
\nAnswer:
\nThe process by which some materials when kept in a medium like air and water spread equally throughout it, it is called diffusion.<\/p>\n

Example :
\nIf a bottle of scent is opened in one corner of a room, the smell spreads in the entire room due to the diffusion of scent molecules.<\/p>\n

Question 3.
\nWhat is Graham’s law?
\nAnswer:<\/p>\n

    \n
  • Thomas Graham, Scottish physical chemist, worked on diffusion of gases.<\/li>\n
  • He had infered that a more soluble substance in a medium diffuse faster than a less soluble substance.<\/li>\n
  • This is popularly known as Graham’s law.<\/li>\n<\/ul>\n

    \"AP<\/p>\n

    Question 4.
    \nWhat is dialysis? Who constructed dialysis machine? The machine works on which principle?
    \nAnswer:<\/p>\n

      \n
    • Dialysis is the artificial method of removal of wastes from the blood.<\/li>\n
    • Dr. William Kolff a Dutch physician in the year 1947 constructed dialysis machine.<\/li>\n
    • Dialysis machine works on principle of diffusion and filtration across a semi permeable membrane.<\/li>\n<\/ul>\n

      Question 5.
      \nWhy did we feel thirstier, after eating 50 gms of potato chips in journey?
      \nAnswer:<\/p>\n

        \n
      • After eating foods preserved like potato chips we feel thirstier because water is drawn from the body into the digestive system to maintain water balance.<\/li>\n
      • So we have to drink more water after eating salty food.<\/li>\n<\/ul>\n

        Question 6.
        \nWhy does CO2<\/sub> can not enter the cell?
        \nAnswer:<\/p>\n

          \n
        • This is due to diffusion of CO2<\/sub> from the cell into the blood through semipermeable membrane or cell membrane.<\/li>\n
        • Due to respiration concentration of CO<sub>2<\/sub> increases in the cell than outside.<\/li>\n
        • Hence CO2<\/sub> diffuses out.<\/li>\n<\/ul>\n

          Question 7.
          \nWater enters the root cells from the soil, why? Name the process involved in this.
          \nAnswer:
          \nWater enters the plant through root hairs, because the concentration of water in the soil arounds the roots is higher than that inside the root epidermis. This process is called osmosis.<\/p>\n

          Question 8.
          \nWhy do dry apricots placed in salt solution do not swell while they do so when kept in water?
          \nAnswer:
          \nDry apricots swell up in water because their cells have a high osmotic concentration which causes passage of water into them. They do not swell up when placed in salt solution because the external solution is hypertonic.<\/p>\n

          \"AP<\/p>\n

          Question 9.
          \nWhat happens if plasma membrane ruptures or breaks?
          \nAnswer:
          \nIf the plasma membrane ruptures or breaks down, the following may happen.
          \na) The cell will lose its shape.<\/p>\n

          b) Since plasma membrane is selectively permeable.
          \nIf it breaks all the useful substances also move out of the cell, all the metabolic activities of the cell will get effected and the cell may die.<\/p>\n

          Question 10.
          \nWhat happens to the dry raisins when we put them in plain water for sometime? What happens if these raisins are now placed in concentrated solution?
          \nAnswer:
          \ni) When we put dry raisins in plain water, they gain water and the size of dry raisins will increase.
          \nii) When these swollen raisins are placed in concentrated salt solution, these loose water and shrink.
          \n\"AP<\/p>\n

          9th Class Biology 4th Lesson Movement of Materials Across the Cell Membrane 4 Marks Important Questions and Answers<\/h3>\n

          Question 1.
          \nWhat are the differences between diffusion and osmosis?
          \nAnswer:<\/p>\n\n\n\n\n\n\n\n
          Diffusion<\/td>\nOsmosis<\/td>\n<\/tr>\n
          1. Substance move from area of high concentration to area of low concentration.<\/td>\nWater moves from area of low concentration to area of higher concentration.<\/td>\n<\/tr>\n
          2. Semipermeable membrane is not necessary.<\/td>\nSemipermeable membrane is necessary.<\/td>\n<\/tr>\n
          3. Diffusion can takes place in solids, liquids and gases.<\/td>\nOsmosis occurs in liquid medium.<\/td>\n<\/tr>\n
          4. It is a physical process.<\/td>\nIt is a physical, physiological process.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Question 2.
          \nWhat is osmosis? Explain with example.
          \nAnswer:
          \nThe flow of water from a region of dilute solution to a more concentrated one through a semipermeable membrane.
          \nEg : Osmosis with kishmish \/ raisin.<\/p>\n

            \n
          1. Dried kishmish are put in pure water and left for some time. Then these kishmish are placed in concentrated solution of sugar or salt.<\/li>\n
          2. It is proved experimentally that kishmish gains water and swells and when placed in concentrated solution the kishmish loose water and shrink.<\/li>\n
          3. In the above two situations water moved from low concentration to higher concen-tration due to osmosis.<\/li>\n<\/ol>\n

            \"AP<\/p>\n

            Question 3.
            \nWhat is cell membrane? What are its functions?
            \nAnswer:
            \nThe outermost, extremely delicate elastic membranous covering of the cell that separate its contents from the external environment is called plasma membrane.
            \nFunctions of plasma membrane :
            \n1. Shape :
            \nPlasma membrane provides a definite shape to semi-fluid contents of the cell.<\/p>\n

            2. Mechanical barrier :
            \nIt functions as mechanical barrier that protects the internal contents of the cell,<\/p>\n

            3. Selectively permeable :
            \nPlasma membrane determines what substances are to be allowed entry or exit from the cell.<\/p>\n

            4. Endocytosis :
            \nIt helps the cell to engulf food and other substances from its external environment by endocytosis.<\/p>\n

            5. Recognition :
            \nThe recognition centres of plasma membrane help in tissue formation, distinction of foreign substances and defense against microbes.<\/p>\n

            6. Flow of information :
            \nPlasma membrane provides flow of information amongst different cells of the same organism.<\/p>\n

            7. Osmosis :
            \nOsmosis occurs due to presence of tiny water channels in the plasma membrane.<\/p>\n

            8. Cell continuity :
            \nAt places plasma membrane of adjacent cells become continuous to form plasmodesmata and cell junctions.<\/p>\n

            9. Specialization :
            \nPlasma membrane gets modified to perform different functions.
            \nE.g. : absorption in microvilli.<\/p>\n

            Question 4.
            \nImportance of osmosis to living organisms.
            \nAnswer:<\/p>\n

              \n
            • Water enters into roots through osmosis.<\/li>\n
            • Water moves between the cells through osmosis.<\/li>\n
            • Osmosis helps in opening and closing of stomata.<\/li>\n
            • It bring about movement of water and minerals in certain plants.<\/li>\n
            • In our body waste materials are filtered from blood.<\/li>\n
            • In our body useful materials are absorbed along with water through osmosis.<\/li>\n<\/ul>\n

              Question 5.
              \nExplain the process of reverse osmosis with a neat labelled diagram.
              \nAnswer:
              \nWhen salt water is separated from fresh water through a semi-permeable membrane, the filteration can be achieved by applying high pressure on salt water. Due to this pressure water moves from salt solution into fresh water leaving the salt behind. This phenomenon is widely used nowadays in water purifiers to filter salt water.
              \n\"AP<\/p>\n

              9th Class Biology 4th Lesson Movement of Materials Across the Cell Membrane Important Questions and Answers<\/h3>\n

              Question 1.
              \nWhat will happen if we keep deshelled raw egg in salt water?
              \nAnswer:
              \ni) Salt water is more concentrated than egg Yolk.
              \nii) When raw de-shelled egg placed in salt water, water from egg comes out through egg membrane. This called exosmosis.
              \niii) Due to exosmosis, the size of the egg decreases.<\/p>\n

              Question 2.
              \ni) Pour sugar solution in the potato cup upto a level as shown by the pin in the figure.
              \nii) Keep the potato cup in the bowl filled with water upto half the height of the potato cup.
              \n\"AP
              \nAnswer the following questions based on the above experiment
              \ni) What is the aim of the experiment?
              \nii) What will be the observation in this experiment?
              \niii) If the potato cup is filled with water and the beaker is filled with sugar solution, what will be the observation?
              \niv) What is the difference between this experiment when compared with dried grapes (kishmish) kept in water?
              \nAnswer:
              \ni) To prove osmosis in potato living cells.
              \nii) Sugar solution level rises in potato cup beyond the point where needle placed.
              \niii) Sugar solution level falls down in potato cup.
              \niv) In both experiments endosmosis is observed in the cells.<\/p>\n

              \"AP<\/p>\n

              Question 3.
              \nLatha dropped some crystals of KMnO<sub>4<\/sub> in a beaker of water and observing to know what happens. What is the phenomenon that occurs in the experiment?
              \nAnswer:
              \nDiffusion<\/p>\n

              Question 4.
              \nRead and complete the following table according to the given information.<\/p>\n\n\n\n\n\n\n\n
              Process \/ Function<\/td>\nName of the Phenomenon<\/td>\n<\/tr>\n
              1. Plasma membrane determines what substances are to be allowed entry or exit from the cell.<\/td>\n<\/td>\n<\/tr>\n
              2. The flexibility of membrane to engulf food and other substances.<\/td>\n<\/td>\n<\/tr>\n
              3. Movements of water through tiny channels of plasma membrane (from lower concentration to higher concentration.)<\/td>\n<\/td>\n<\/tr>\n
              4. Movement of molecules \/ substances from higher concentration to lower concentration.<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              Answer:<\/p>\n

                \n
              1. Selective permeability<\/li>\n
              2. Endocytosis<\/li>\n
              3. Osmosis<\/li>\n
              4. Diffusion<\/li>\n<\/ol>\n

                Question 5.
                \nObserve the following substances and answer the following questions.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
                Substance<\/td>\nShould go into the cell<\/td>\nShould go out of the cell<\/td>\n<\/tr>\n
                Oxygen<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Glucose<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Proteins<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Fats<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Vitamins<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Minerals<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Carbondioxide<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
                Wastes<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                a) Which substances should go into the cell?
                \nb) Which substances should go out the cell?
                \nc) Which is useful to transport the substances into the cell?
                \nd) What is use of osmosis?
                \nAnswer:
                \na) Oxygen, Glucose, Proteins, Fats, Vitamins.
                \nb) Carbondioxide, Waste materials.
                \nc) Plasma membrane.
                \nd) Plasma membrane is a selectively permeable membrane. It allows entry of useful certain materials exit of some unuseful substances while preventing passage to remaining substances.
                \nIt helps in keeping the ceil alive.<\/p>\n

                Question 6.
                \nObserve the diagram answer the following questions.
                \na) Which chemical material is used to made a semi permeable membrane from an egg?
                \nb) Which precautions do you take to make a semipermeable membrane?
                \n\"AP
                \nAnswer:
                \na) Dilute Hydrochloric Acid.
                \nb) 1) Keep the raw eggs in dil HCl for 4 to 5 hours.
                \n2) Wash the eggs under tap water.
                \n3) Carefully pierce a pencil sized hole in the egg membrane and drain the contents.
                \n4) Again wash the membrane with fresh water.<\/p>\n

                Question 7.
                \nTwo beakers, funnel, filter paper, retort stand, sugar, dye and wheat or rice flour and plastic bottle would be given to you. What experiment will you do with this? Write the procedure and precautions of that experiment.
                \nAnswer:
                \n\"AP<\/p>\n

                  \n
                1. Arrange the filtering apparatus as shown in the figure.<\/li>\n
                2. Prepare wheat or rice powder solution in a beaker by adding one tea spoon of powder in 100 ml of water.<\/li>\n
                3. Add a drop of tincture iodine to the solution.<\/li>\n
                4. Now pour the solution into the funnel.<\/li>\n
                5. Filter paper allows water and dissolved rice powder to pass through it.<\/li>\n
                6. Filter paper does not allow the undissolved powder precipitate through it.<\/li>\n<\/ol>\n

                  Precautions :<\/p>\n

                    \n
                  1. Ensure that the using filter paper should not have any damage or holes.<\/li>\n
                  2. Stir the powder solution continuously, while pouring it slowly through filter paper.<\/li>\n<\/ol>\n

                    Question 8.
                    \nWhat happens if cells are not permeable
                    \nAnswer:
                    \nIf cells are not permeable, they will not get the useful substances like minerals, water, nutrients and oxygen. Like this way, the waste products released during cellular activities will not be sent out. As a result the cell may die.<\/p>\n

                    \"AP<\/p>\n

                    Question 9.
                    \nRajesh conducted an experiment to know the movement of substances using potato and sugar solution.
                    \na) What is the objective of Rajesh\u2019s experiment?
                    \nb) Write the materials required by Rajesh to conduct this experiment.
                    \nc) Where does the level of solution increase?
                    \nd) What is your observation in this experiment?
                    \nAnswer:
                    \na) To observe osmosis
                    \nb) One raw potato, one boiled potato, two beakers, bowls, two pins, water, sharp knife.
                    \nc) Increase in the level of sugar solution in potato.
                    \nd) Water always moves towards the sugar solution the movement of water from less concentration to high concentration through a membrane is called osmosis.<\/p>\n

                    Question 10.
                    \nGive some examples for process that occurs through permeable membrane that you observed in your daily life.
                    \nAnswer:
                    \nEx : 1. Water moves from one cell to another through osmosis.
                    \nEx : 2. Movement of water from soil to roots.
                    \nEx : 3. Waste materials in our blood are filtered.<\/p>\n","protected":false},"excerpt":{"rendered":"

                    AP State Syllabus AP Board 9th Class Biology Important Questions Chapter 4 Movement of Materials Across the Cell Membrane. AP State Syllabus 9th Class Biology Important Questions 4th Lesson Movement of Materials Across the Cell Membrane 9th Class Biology 4th Lesson Movement of Materials Across the Cell Membrane 1 Mark Important Questions and Answers Question …<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[5],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/2626"}],"collection":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/comments?post=2626"}],"version-history":[{"count":0,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/2626\/revisions"}],"wp:attachment":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/media?parent=2626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/categories?post=2626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/tags?post=2626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}