9th standard Science Chapter-7 November 30, 2020December 26, 2020wefru 9th Standard Science quiz Chapter-7 0 Created on November 30, 2020 By wefru 9th standard science Chapter 7 TEST YOUR SKILLS 1 / 10 Q.61 Which of the following statement marks as a difference between plant cell and animal cell? Plant cells have cell wall which animal cells do not. Plant cells do not have vacuole while animal cells do have. Plant cells have only cell membrane while animal cells have both cell wall as well as cell membrane. Plant cells have more plastids while animal cells have few plastids. 2 / 10 Q.62 Endoplasmic reticulum one of the cell organelles, exists as a membranous network that extends from outer membrane of nucleus to the plasma membrane making a connection between them.Which of the following statements is not related to the endoplasmic reticulum? It can be the site of energy generation. It can be the site of some biochemical activities of the cell. It transports materials between various regions in cytoplasm. It transports materials between various regions in body. 3 / 10 Q.63 Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. Can you pick out the option among the following which does not belong to this process? Plasma membranes contain chitin sugar in plants. Molecules soluble in organic solvents can easily pass through the membrane. Membranes are made of organic molecules such as proteins and lipids. none of the above 4 / 10 Q.64The nucleus controls all the activities of the cell and acts as a site of DNA material and protein synthesis. It is composed of some components which all together give the nucleus its functionality. Here is shown a figure of nucleus with some of its components labeled as A, B, C and D. can you name these components correctly? A – Nucleolus; B – Chromatin; C – Nuclear membrane; D – Nucleoplasm A – Nucleus; B – Chromatin; C – Nuclear membrane; D – Nucleoplasm A – Nucleons; B – Chromatin; C – Nuclear membrane; D – Nucleoplasm none of the above 5 / 10 Q.65 You must have observed that a fruit when unripe is green but it becomes beautifully coloured when ripe. According to you what is the reason behind this colour change. Chloroplasts change to chromosplasts Chromosplasts change to chromosomes Chloroplasts change to chromosomes Chromosplasts change to chloroplasts 6 / 10 Q.66 Rahul’s mother was going to make pickle. For this she cut the vegetables into small pieces and put them in the sun for few hours. Rahul was observing all her activities very curiously and asked his mother if why she had put the salted vegetables in the sun. among the following what might be the most appropriate answer for his question? So that the pickle may get extra flavour. So that the cut vegetables may absorb the vitamin d as a nutrient from the sun rays. So that the vegetables may lose all the water by diffusion and evaporation and become dry. So that the salt may get evenly and properly absorbed by the vegetables. 7 / 10 Q.67 The process of plasmolysis in plant cell is defined as: Breakdown of plasma membrane in hypotonic solution. Shrinkage of cytoplasm in hypertonic medium. Shrinkage of Nucleoplasm. None of these. 8 / 10 Q.68 Mitochondria are the sites of respiration in the cell. They oxidize carbohydrates and fats present in the cell to produce carbon dioxide, water and a lot of energy. The energy so released is stored in the form of ATP molecules. Since mitochondria in the cell are used to synthesize energy so, they are also called: Energy currency of the cell Energy generator of the cell Kitchen of the cell Power house of the cell 9 / 10 Q.69 Cell is the structural and functional unit of life. The word cell is derived from the Latin word ‘cellula’ which means “a little room”. Can you name the scientist who coined the term cell? Robert Hooke Anton Von Leeuwenhoek Robert Brown Ernst Haeckel 10 / 10 Q.70 In a test, a teacher collected the answers written by four students as the definition of osmosis as given below. Read carefully and select the correct one. Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane. Movement of solvent molecules from its higher concentration to lower concentration. Movement of solvent molecules from higher concentration to lower of solution through a permeable membrane Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane. Your score isThe average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz