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8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
http://cbsenotes.blogspot.in/2012/04/class9ch5cellfundamentalunitof.html 1/15
Blog provides NCERT solutions, CBSE, NTSE, Olympiad study material, model test papers, importantQuestions and Answers asked in CBSE examinations. References to Educational Sites and resources.
CBSE Papers, Questions,Answers, MCQ ...
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SUNDAY, APRIL 8, 2012
Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & AQ1: Who observed the cells first time?Answer: Robert Hooke. He observed thin slice of cork cells under a simple microscope.
Q2:Define CellAnswer: Cell is the structural and functional unit of life.
Q3: Who proposed the cell theory?Answer: Schleiden (1838) and Schwann (1839).
Q4: Who expanded cell theory by suggesting that all cells arise from preexistingcells?Answer: Virchow (1855.
Q5: In which year electron microscope was invented?Answer: 1940
Q6: Name the book in which Robert Hooke published his observations about corkcells.Answer: Micrographia.
Simple Microscope made by Robert Hooke (credits:Wikipedia)
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Q7: Who discovered nucleus in the cell?Answer: Robert Brown (1831)
Q8: Name the two postulates of the cell theory.Answer:
Cell is the basic structural and functional unit of life for all living beings.All cells arise from preexisting cells.
Q9: Who coined the term 'protoplasm'?Answer: Purkinje in 1839 coined the term ‘protoplasm’ for the fluid substance of the cell.
Q10: Name the largest cell?Answer: The egg of the ostrich is the largest cell (170 x 135 mm) which can be seen byan unaided eye.
Q11: Name the world's smallest cell.Answer: It is a type of bacteria called Mycoplasma about a diameter of 10µm(micrometre).
Q12: Name the smallest cell in human body.Answer: Human sperm cell about 5x3 µm.
Q13: Name the biggest cell in human body.Answer: Human ovam about 1mm in diameter.
Q14: Name the longest cell in human body.Answer: Human nerve cell about 1 meter long.
Q15: Name the cell in human body which cannot reproduce.Answer: RBCs or Red Blood Corpuscles/cells.
Q16: Give an example of anucleate cell i.e. cell without nucleus. Answer: RBCs or Red Blood Corpuscles/cells in mammals.
Q17: Give an example of cells containing two nuclei (Binucleate).Answer: Paramecium
Q18: Give examples of cells which are mutinucleate (i.e. having many nuclei).Answer: Striated muscles, few types algae and fungi.
Q19: What is the plasma membrane composed of?Answer: Lipids and Proteins. It hasviscous bilayer of lipid with protein molecules occurring on inner and outer sides of lipidbilayer. (Phospholipid bilayer)
Q20: Who proposed fluidmosaic model of cell or plasma membrane?Answer: Singer and Nicholsan (1972)
Note: The fluid mosaic model describes the plasma membrane as a phospholipid bilayerwith embedded proteins.
Q21: Is plasma membrane permeable or selectively permeable?Answer: Selectively permeable i.e. it allows certain molecules or ions to pass through it.
An ostrich egg (Source:wikipedia)
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8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Q22: What are different types transport of components across cell membrane?Answer: Two types:
Passive Transport: e.g. Diffusion, OsmosisActive Transport: e.g. endocytosis, exocytosis
Q23: Define Passive Transport.Answer: Passive transport is the net movement of materials across membranes thatdoes not require any special source of energy.
Q24: What is diffusion?Answer: Diffusion is the net movement of molecules from high to regions of lowerconcentration as a result of random molecular motion. Diffusion tends to distributemolecules uniformly.
Exchange of gases like CO2 and O2 in lungs, plants, blood cells, O2 entering stomata ofleaves are examples of diffusion.
Diffusion is passive transport i.e. no external energy is provided for the movement ofmolecules. The natural kinetic energy of the particle supplies the energy.
Q25:Define Osmosis. What are different types of osmosis? Give examples ofosmosis.Answer: Osmosis is a special type of diffusion i.e. passage of water (solvent) across aselectively permeable membrane, from a region of high water concentration (dilutesolution) to the region of low water concentration (concentrated solution).
Osmosis is also a passive transport i.e. no external energy is required for the passage.
There are two type of osmosis:
1. Endosmosis: The process in which the water molecules enter into the cell isknown as endosmosis.
2. Exosmosis: The process in which the water molecules move out of the cell isknown as exosmosis.
Examples of Osmosis are:
Absorption of water by plant roots.Absorption of water by alimentary canal.Reabsorption of water by tubules of the nephron in kidneys.
Q26: What happens to a cell (plant cell or animal cell) when placed in the followingsolutions:(a) Hypotonic solution(b) Isotonic solution (c) Hypertonic solution
Answer:(a) Hypotonic Solution: external solution is dilute i.e. high water concentration (lowsolute concentration). In this case water will rush into the cell and it will gain water.
(b) Isotonic Solution: external solution concentration is same as internal solutionconcentration of the cell. In this case, there is no net movement of water.
(c) Hypertonic Solution: external solution is of high solute concentration i.e. low waterconcentration. Here water will rush out from cell and it will shrivel/shrink.
The figure below shows red blood cell and plant cell osmotic behaviour in various typesof solutions.
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8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Q 27: What is plasmolysis?
Answer: When a living plant cell loses water placed in hypertonic solution, the plant cellshrinks away from the cell wall. This process is called plasmolysis.Plants withplasmolysed cells wilt.
Q28: Place a deshelled egg in water for five minutes. What do you observe?(Note: De‐shelled egg means,the shell of an egg is removed by dissolving it in dilutehydrochloric acid. The shell is mostly calcium carbonate. A thin outer skin nowencloses the egg.)
Answer: The egg swells because water passes into it by osmosis. (hypotonic solution).
Q29: What will happen if a de‐shelled egg in a concentrated salt solution for 5minutes?
Answer: The egg shrinks because water passes out of the egg into saLt solution. Thesalt solution is moreconcentrated than the inside of the egg. (Hypertonic)
Q30 (CBSE): Put dried raisins in plain water and leave them for some time. Then placethem in concentrated solution of sugar or salt. What do you observe in both cases?
Answer: Case I: Raisins gain water and swells when placed in pure water.Case II: When placed in the concentrated solution, raisins lose water and hence shrink.
Q31: What would happen if the plasma membrane ruptures or breaks down?
Answer: Plasma or Cell membrane is a selectively permeable membrane i.e. it allowsmovement of certain materials in and out to the cell. In case plasma membraneruptures (like in hypertonic solution), the cell will shrivel and eventually die. At thistime, lysosomes of the cell will come into action. Lysosomes will release digestiveenzymes and eat up worn out cell organelles and foreign material.
Q32: What do you mean by Endocytosis? How does an Amoeba obtain its food?
Answer: The process by which a cell engulfs material to bring it into the cell is calledendocytosis. It is a type of active transport. Endocytosis is of two types:
Phagocytosis: It refers to the process of engulfing large particles (or celleating).
Pinocytosis: it refers to engulfing macromolecules. (or cell drinking)
For example, Amoeba obtains its food by endocytosis in which the flexibility of the cellmembrane enables the cell to engulf in food and other material from its externalenvironment.
Q33: Define Exocytosis.
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8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Answer: Exocytosis is process to move material to the outside of the cell. A vesiclefuses with the plasma membrane and discharges its contents outside. This allows cellsto secrete molecules. It is a type of active transport.
Q34: Why are lysosomes known as suicide bags?Answer: Lysosomes are organelles that contain digestive enzymes. They digest excessor worn out organelles, food particles, and engulfed viruses or bacteria. Lysosomesfuse with vacuoles and dispense their enzymes into the vacuole, digesting its contents.Sometimes, lysosomes digest the cells that contain them. It happens when cells getdamaged or destroyed. That's why lysosomes are called suicidal bags.E.g. When a tadpole develops into a frog, lysosomes within the cells of the tadpole’stail cause its digestion. Or Lysosomes help in defense by digesting germs, as in whiteblood cells.
Q35: Viruses are(a) Uni cellular micro‐organisms(b) Bi‐Cellular micro‐organisms(c) Multi‐cellular micro‐organisms (d) Non‐cellular micro‐organisms
Answer: (d). Non‐Cellular. Viruses lie on the line of division between living and non‐living. They are non‐living carrying RNA material. They act as living when find a suitablehost and multiply.
Q36: Who is known as Father of Biology?Answer: Aristotle.
Q37: Who discovered Golgi apparatus?Answer: Camillo Golgi
Q38: Which cell organelle is known as "protein factory"?Answer: Ribosomes
Q39: What is the energy currency of the cell called?Answer: ATP (Adenosine triphosphate)
Q40: When chromosomes are visible in the nucleus?Answer: During cell division.
Q41: Which of the following is NOT involved in the synthesis of proteins?(a) rough ER(b) smooth ER(c) Golgi body(d) ribosomes
Answer: (b) smooth ER.
Concept Map on Cell Structure
Cell Structure (concept map)
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Rough ER is the site for protein synthesis and has ribosomes embedded. Ribosomes onthe rough ER produceproteins that are passed from the cell; the Golgi body then packages them for thispurpose. Smooth ER is used mainly in the making of lipids and detoxifying enzymes.
Q42: Which of the following often distinguishes plant cells from animal cells?(a) centrioles(b) nucleus(c) chromatin(d) rough ERAnswer: (a) Centrioles
Q43: Are plastids present in all cells? What are its types?Answers: Plastids are present only in plant cells. Based on colour pigments, there arethree types of plastids:
Leucoplasts: White or colourless.
Chromoplast: Coloured like blue, red, yellow.
Chloroplast: Green in colour.
Q44: Name the sac like structure which form the grana? Answer: Sac like structures in chloroplasts are called thylakoids.
Q45: What are the conditions for osmosis?Answer: Conditions for osmosis are:
1. There should be two solutions of different concentrations.
2. The membrane separating these two solutions should be semipermeable.
Q46: Will the temperature have any effect on the process of the osmosis? Answer: Yes the higher temperature will increase the rate of water entering the cell asit increases the kinetic energy of the solution.
Q47: What is osmoregulation?Answer: The regulation of the water content of the cell is called osmoregulation.
Q48: Which organ of the plant body helps in osmoregulation?Answer: Leaves
Q49: Which organelle of the cell in animals helps in osmregulation?Answer: Contractile Vacuole.
Q50 What are centrosomes? What functions do they perform?
Answer: Centrosome is asmall, star shaped protoplamicorganelle and is present nearto nucleus. In animal cells, itconsists of two small granulescalled centrioles. Thesecentrioles are orthogonallyarranged i.e. lie at right anglesto each other. In plant cells,centrioles are absent.
Functions of Centrosomes:
1. Initiate cell division
2. During cell division, centrioles move to opposite poles of the cell and help in
Cetrosomes during cell division
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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spindle formation.
3. They form basal bodies (microtubules like sturtures) which form cillia orflagella.
Click on the image below to see video showing cell division in pig kidney cells.Hamamatsu.com, a Japanese company, sells microscopy related cameras has anice collection of cell images.
Q51: Who is known as 'Father of Microscopy'?
Answer: Antony van Leeuwenhoek
Q52: Are Viruses Prokaryotic or Eukaryotic?
Answer: Neither of the two. Viruses are smaller than prokaryotic cells. A virus isconsidered as a simple nucleic acid surround by a protein coat. They act as non‐livingand become living on finding a suitable host.
Q53: Which cell organelle is called "kitchen of plant"?
Answer: Plastids
Cell Division(source: http://learn.hamamatsu.com)
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Q54: Which cell organelle is called 'control center'?
Answer: Nucleus.
Q55: Which cell organelle is called 'transport system'?
Answer: Endoplasmic Reticulum
Q55: What is Endoplasmic Reticulum(ER)? Name its types?
Answer: The cell organelle, Endoplasmic reticulum (ER) is an extensive, interconnected,membrane‐bound network of tubes and sheets. It consists of various channels likecisternae, vesicles and tubules. ER carries materials throughout the cell. There are twotype of ERs:
Rough Endoplasmic Reticulum (RER) ‐ bears ribosomes, involved in proteinsynthesis.
Smooth Endoplasmic Reticulum (SER) ‐ Does not bear ribosomes, involvedin lipid synthesis.
Q56: What are the functions of Endoplasmic Reticulum (ER)?
Answer:
1. Helps in transporting materials from one part to other inside cell.
2. Acts as skeletal framework and provides mechanical strength to cytoplasmicmatrix.
3. Provides larger surface area for synthesis of various metabolic activities.
4. It contains various enzymes which act as catalyst in synthesis of lipids andproteins.
5. SER is also involved in the process of detoxification of drugs and poison.
Q57: What are the components nucleus?
Answer:
1. nucleolus
2. nuclear membrane
3. chromatin network (forms in chromosomes and carry genes).
4. nucleoplasm
Q58: What is the function of nucleoplasm?
Answer: Nucleoplasm is a semi‐fluid which contains a number of enzymes which helpin synthesis and functioning of DNA and RNA (genetic material).
Q59: How chromatic network is related to chromosomes?
Answer: Chromatin network is a tangled fibrous mass inside nucleus. The chromatinthreads condense and turn into chromosomes during cell division.
Q60: What are chromosomes?
Answer: Chromosomes are compact rod like bodies, which are formed at the time ofcell division from chromatin material. They are made up of DNA and carry genes (unit
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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of inheritance).
Q61: What is the full form of DNA and RNA?
Answer: DNA ‐ Deoxyribo Nucleic Acid RNA ‐ Ribo nucleic acid
Q62: Who discovered Virus?
Answer: Virus was discovered by Ivanowsky, a Russian Botanist in 1892.
Q63: What are the function of nucleus?
Answer:
1. Nucleus controls all the cellular activities of the cell.
2. Nucleolus is involved in synthesis of ribosomes.
3. Nucleus contains hereditary information of cell.
4. It is responsible for cell division (reproduction) and transmission of geneticinformation from parents to offspring.
Surface Area of a cube (SA) = (length x Width) x 6 FacesVolume of cube (V) = length x length lengthSurface Area to Volume Ratio = SA/VSA/V ratio of cube of 1 cm length = 6:1SA/V ratio of cube of 2 cm length = 24/8 = 3:1SA/V ratio of cube of 4 cm length = 96/64 = 1.5: 1⇒ SA/V ratio decreases as the sizes of the cube increases
Q64: Why can't single cells grow very large? Or Big organisms like human beings aremulti‐cellular? Why can't such big organisms be a single large cell?
Answer: Cell is the fundamental unit of life. All metabolic activities (necessary for life)takes place inside the cell. All raw materials required for these metabolic activitiesenter through the cell surface via cell membrane. Greater the surface are, largeamount of raw material can enter (this is the case of uni‐cellular micro‐organisms). Asthe size of cell grows larger, the Surface Area to Volume (SA/V) ratio decreases, itmeans raw material required for the cell to survive will not be sufficient. Thus, SA/Vratio limits the size of the cell. Therefore big organisms like human beings are mulch‐cellular.
Q65(NTSE Stage2): Which of the following is an example of a single cell that does notfunction as a full fledged organism?
(a) White blood cells (WBC)(b) Amoeba(c) WBC and Amoeba(d) Paramecium
Answer: (a) WBC
Q66: Why do vegetable vendors (subzi‐walla) regularly sprinkle water on thevegetables in their baskets?
Answer: Water makes a hypotonic environment for the plant cells and they take upwater to avoid plasmolysed condition. Therefore vegetables look crisp and fresh.
Surface Area to Volume Ratio
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Q67: Why do we stain cells while observing under microscope? List commonly usedstains.
Answer: Stains help us visualize specific organelles of cells in better way. Otherwisethese organelles are not easily recognizable via microscope. Stains or dyes are basic oracidic in nature have affinity to certain organelles. For example, methylene blue is abasic dye which has affinity to nucleic acid and hence it can stain nucleus. Methyleneblue is commonly used to stain animal cells. Similarly, iodine dye is used to detectstarch and used to stain plant cells. Eosin is used to identify RBCs, cell membrane andcytoplasm. Safarnin is another nuclear stain, and also used to stain Rheo leaves tovisualize stomata.(Read a nice article on Cell Stain)
Q68: Are there any exceptions to cell theory proposed by Schleiden & Schwann andVirchow? If yes, what are those?
Answer: Yes there are exceptions to cell theory. These are:
1. Cell theory do not explain nature of Virus. They become live and multiply thoughthey are made up of non‐living material.
2. How come the first living cell originated or how life began on the earth.(Scientists J.B.S. Haldane, Stanley L. Miller and Harold C. Urey did experimentsto on this.).
3. Mitochondria and chloroplasts have their own genetic material and canreproduce independently.
Q69: What is the thickness of cell membrane?
Answer: 7‐10 nano‐meters.
Q70: Why is mitochondria absent in red blood cells?
Answer: RBCs are the oxygen and food transporters to different body cells. If they havemitcochondira, they will consume the carrying oxygen for themselves.
Q71: Name the cell organelles which their own DNA and Ribosomes.
Answer: Mitochondria and Plastids.
Watch youtube video on The Wacky History of Cell Theory by TED.com
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The wacky history of cell theory - Lauren Royal-Woods
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28 comments:
Anil Kumar November 16, 2012 at 9:06 PM
What is the difference between chloroplast and chromoplast?
Reply
www.eduvictors.in November 16, 2012 at 10:20 PM
Chloroplasts are green colour plastids due to the presence ofphotosynthetic pigment i.e. chlorophyll. While chromoplasts are yellow orreddish coloured plastids due to presence of pigments other thanchlorophyll. Chromoplasts are responsible for giving colour to flowers andfruits.There are leucoplasts which store nutrients such as starch.
Vaishnavi Pawar August 14, 2014 at 6:41 AM
Chromoplasts are colour giving plastids which give colour to flowers andplants( except green). Chloroplasts are the plastids which give colour to thegreen plants as they contain a green colour pigment chlorophyll. The lastmember of the family of plastids is leucoplasts. They store food nutrients likestarch, oils, etc
Malay Goel May 15, 2013 at 4:52 AM
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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State the observation in the following:a) Dry apricots are left for sometimes in pure water and later transferred to sugarsolution.b) A RBC is kept in concentrated saline solution.
Reply
Malvika Arora May 19, 2013 at 12:21 AM
What is active transport?
Reply
Eshita Agarwal May 22, 2013 at 7:11 AM
What would happen if shelled raw egg and de shelled boiled egg are placed in water?
Reply
Karan Sharma June 9, 2013 at 10:31 PM
what happens when egg is first put in hcl for sometime and then placed in concentratedsalt solution
Reply
Deependra Singh June 17, 2013 at 11:39 PM
For NCERT Solution from Class 9 to 12 visit www.ncerthelp.com orwww.ncerthelp.blogspot.in
Reply
RAY June 20, 2013 at 10:49 AM
Thankzzzz...... it helped a lot....
indu singh July 10, 2013 at 11:27 PM
nice..!
Reply
Sri Madhumitha July 18, 2013 at 5:50 AM
thanks...!! but they didn't mention the year , the cell was discovered...!!
Reply
n sharma July 27, 2013 at 6:39 AM
can you give a summary of this chapter
Reply
vinita yadav August 26, 2013 at 8:12 AM
can you give fine[brief] notes on chapter cell?
Reply
Riya Varma September 13, 2013 at 9:49 AM
in which way location of chlorophyll is different in eukaryotes as compared toprokaryotic cell photosynthetic bacteria?
Reply
8/24/2015 CBSE Papers, Questions, Answers, MCQ ...: Class 9 Ch5 Cell:Fundamental Unit of Life NCERT Q & A
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Krishna Dev April 11, 2014 at 11:23 PM
What would happen to the life of a cell if there was no gogli apparatus????
Reply
Subir Mukherjee April 27, 2014 at 12:29 AM
I think the ans of question no 25 is not correct please do the needful
Reply
Subir Mukherjee April 27, 2014 at 12:40 AM
sorry question no. 24
Reply
adithya manoj May 31, 2014 at 2:41 AM
how did the cell form????????????
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Preethi .S May 31, 2015 at 5:44 AM
This comment has been removed by the author.
Priyank priyank godhani August 28, 2014 at 7:25 AM
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Priyank priyank godhani August 28, 2014 at 7:27 AM
Do all organisms have same number of cell? Give reason for your answer.
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Sumer Choudhary July 25, 2015 at 10:22 AM
This comment has been removed by the author.
Sumer Choudhary July 25, 2015 at 10:22 AM
no,because size pf organisms are different from each other.
Priyank priyank godhani August 28, 2014 at 7:31 AM
Describe the molecular structure of plasma membrane.
Reply
Akshara Varna April 11, 2015 at 11:43 PM
why cant single cells grow very large
Reply
Akshara Varna April 11, 2015 at 11:44 PM
it is truely helpful and interesting also
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kunal jena July 25, 2015 at 2:43 AM
what are leucoplasts
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kunal jena July 25, 2015 at 2:44 AM
why golgi body is near ER
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