Science Chapter-5 Fundamental Unit of Life - Cell | Important Notes of Class 9 Chapterwise| SOLUTION

ABOUT EDUCATION AND ENTRANCE COMPETITION. JAMIA Millia Islamia Previous Years Questions Paper All Courses School and College | 6,9,11 & All. Dear Friends is video me aap jamia millia Islamia ka previous years ka questions Paper ko dekhiyega ki kis tarah se exam me puchhe jate Hain all courses ka question paper aapko is video me milega jaise ki THE FUNDAMENTAL UNIT OF LIFE Question 1: Who discovered cells and how ? Answer 1: Cells were discovered in 1665 by an English Botanist Robert Hooke. He used a primitive microscope to observe cells in a cork slice. Question 2: Why is the cell called the structural and functional unit of Life ? Answer 2: Cells constitute various components of plants and animals. A cell is the smallest unit of life and is capable of all living functions. Cells are the building blocks of life. All cells vary in their shape, size and activity they perform. In Fact the shape and size of the cells is related to the specific functions they perform. Question 3 : Why is the plasma membrane is known as a selectively permeable membrane ? Answer 3: The cell membrane or the plasma membrane is known as selectively permeable membrane because it regulates the movement of substance in and out of the cell. This means that the plasma membrane allows the entry of only some substances and prevents the movement of some other materials. Question 4: Can you name the two organelles we have studied that contain their own genetic material ? Answer 4 : Mitochondria and Plastids Question 5: Why are lysosomes known as suicide bags ? Answer 5: Lysosomes are membrane – bound vesicular structures that contain powerful digestive enzymes. These enzymes are capable of breaking down any foreign food particle or microbes entering the cell. Sometimes, lysosomes can cause self destruction of a cell by releasing these digestive enzymes within the cells. Hence, they also known as suicidal bag. Question 6: Make a comparison to write down ways in which plant cells are different from animal cells. Answer 6: The cells of animals and plants have the following differences :- ANIMAL CELLS 1. Animal cells are generally small in size. 2. Cell wall is absent 3. Vacuoles in animal cells are many small and temporary. 4. Animal cells have a single highly complex and prominent Golgi apparatus. 5. Animal cells have centrosome and centrioles. PLANT CELL 1. Plant cell are larger than animal cells. 2. The plasam membrane of plant cells is surrounded by a rigid cell wall of cellulose. 3. Plastids are present 4. Most mature plant cell have a permanent and large central sap vacuole. 5. Plant cells have many simpler units of Golgi apparatus called dictyosomes. Question 7: How is prokaryotic cell different from eukaryotic cell: Answer 7: Difference between prokaryotic cell and eukaryotic cell:- PROKARYOTIC CELL: 1. Cell size is generally small. 2. Nuclear region is called nucleoid and is not surrounded by a nuclear membrane. 3. Only a single chromosome is present. 4. Nucleolus is absent. 5. Membrane bound cell organelles are absent. 6. Cell division by fission or budding (no mitosis). EUKARYOTIC CELL: 1. Cell is generally large. 2. Nuclear material is surrounded by a nuclear membrane. 3. More than one choromosome is present. 4. Nucleolus is present. 5. Membrane bound cell organelles. 6. Cell division mitotic or meiotic. Question 8: Which organelle is known as the powerhouse of the cell? Why? Answer 8: Mitochondria are known as the power house of the cell because they contain enzymes that are needed for stepwise oxidation of food stuffs (carbohydrates, fats and lipids) present in the cell to CO2 and water. Oxidation of food releases energy which is used to form high energy ATP molecules. ATP ( adenosine triphosphate) is known as energy currency of the cell and it is used as cellular fuel. Energy stored in ATP is used to bring about energy requiring activities of the cell such as photosynthesis and muscle contraction. Question 9: How does Amoeba obtain its food ? Answer 9: Amoeba has flexible cell membrane. It enables amoeba to engulf in food by the process called endocytosis. Question 10: What is osmosis ? Answer 10: The diffusion of water or solvent through a semi-permeable membrane from a solution of lower concentration of solutes to a solution of higher concentration of solutes, to which the membrane is relatively impermeable is called osmosis. Sociology Psychology Geography Political science BA programme H Persian Islamic studies Hindi Diploma Polytechnic Thanks For Watching this video By MSK That means Mohd Sajid khan Mera channel ko subscribe karna na bhulen aur Mera channel ko subscribe Karen aur jamia and education se related update rahen Allah Hafiz. APP LINK https://snappy.appypie.com/user/app/072503dbb9b1 FACEBOK : https://www.facebook.com/ INSTAGRAM : https://www.instagram.com/ WEBSITES : http://www.jccstudy.com/ E-mail : [email protected] Twitter : https://twitter.com/home Contact : 9643013894, 7011339746, 8178809656