(ii) It gives internal support to the colloidal matrix e., cytoplasm. This shows that selective premeability is property of living plasma membrane. 41). (c) the concentration of water molecules is same in the cell and in the surrounding medium (c) Packaging and dispatching unit of the cell is golgi complex as they store, modify, package and condense the proteins synthesised by ribosomes. Answer: Outer membrane b. Question 37: All raw materials required for these metabolic activities enter through the cell surface via cell membrane. (iii) They set aside digestive enzymes in tiny membrane bound vesicles which later become lysosomes. Which plastids are colourless? Question 57: 9. Activity 10.1 Class 9 Science Gravitation, Atoms and Molecules MCQ Chapter 3 Class 9 Science, Activity 15.1 Class 10 Science Our Environment, Explain Activity 6.1 NCERT class 10 science Life processes, Activity 3.4 NCERT Class 10 Science, Metals and Non-metals. The structure of plasma membrane can be observed under an electron microscope only. Animals cannot synthesise their own food because chloroplast is not found in the animal cell. Endoplasmic reticular is the transporting channel of the cell as it connects the cell membrane to the nuclear membrane. The correct matching is A.→ (4) B. Answer: They were composed of box-like compartments, forming a honeycomb structure. Answer: (c) shrinkage of nucleoplasm (Also, refer to Q. Do you agree that ‘A cell is a building unit of on organism’. During the breakdown of cell structre, when the cells gets damaged, the lysosomes may break and enzymes, which are capable of digesting or breaking down all organic nutrients may release into the cell. How does Mitochondria make their own protein? a. Semi-permeable b. fully-permeable c. Selectively permeable d. Non-permeable. Nucleus is composed of two membrane called nuclear membrane, nucleoplasm, nucleolus and chromatin material. The main functions of vacuoles are. They work in osmoregulation, e., the maintenance of internal pressure. (a) When a cell possess higher water concentration than the surrounding medium then exosmosis occurs in the cell due to the difference in water concentration in the cell and surrounding medium and cells shrinks. During starvation, lysosomes act on their own cellular organelles and digest them. In animal cells, vacuoles are smaller in size and lesser in number than in plant cells. Answer: (a) exocytosis                                            (b) endocytosis Question 29: Answer: Chloroplasts Green-coloured plastids. These are filled with liquid or sap and are membrane-bound organelles. If you are provided with some vegetables to cook. discoid sacs (called thylakoids) containing the molecules of chlorophyll. Here you can get Class 9 Important Questions Science based on NCERT Text book for Class IX.Science Class 9 Important Questions are very helpful to score high marks in board exams. Answer: (a) endoplasmic reticulum Unicellular freshwater organisms and most plant cells tend to gain water through osmosis. We have Provided The Fundamental Unit of Life Class 9 Science MCQs Questions with Answers to help students understand the concept very well. a. a large room b. a little room c. An old room d. None. The undefined nuclear region of prokaryotes are also known as One of the special function of smooth endoplasmic reticulum of liver of vertebrate is detoxification. (i)   Presence of chloroplast in plant cell. (c) Ribosomes are dense, spherical and granular particles which remains freely in the matrix or remain attached to endoplasmic reticulum. Lysosomes are called the suicidal bags of cell as they digest the organelles of their own cell. They play important role in synthesis of proteins. Answer: (iii) Tubules Log in, Concise Mathematics Class 10 ICSE Solutions 2018, Click to share on WhatsApp (Opens in new window), Click to share on Telegram (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window).

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