NCERT Solutions for Class 9 Science Chapter 5
NCERT Solutions for Class 9 Science Chapter 5 The fundamental unit of life Page 59, Page 61, Page 63, Page 65 and Exercises in English Medium updated for new academic session 2021-22 based on latest NCERT Books.Download UP Board Solutions class 9 Science chapter 5 in Hindi medium. Hindi Medium versions of Chapter 5 Page 66 ke Uttar or Page 68 ke Uttar or Page 70 ke Uttar or Page 73 ke Uttar and Abhyaas ke Uttar are also available in PDF form to free download. Download NCERT Solutions 2021-2022 and NCERT Solutions Apps for all subjects based on latest NCERT Books 2021-2022. We have updated our contents for CBSE, UP Board, Gujrat Board, MP Board and other boards who are following latest CBSE Syllabus 2021-22.
Class 9 Science Chapter 5 Question and Answers
|Class: 9||Science (English and Hindi Medium)|
|Contents:||English and Hindi Medium Solutions|
|Chapter 5:||The fundamental unit of life|
9th Science Chapter 5 Answers in English and Hindi Medium
NCERT Solutions for Class 9 Science Chapter 5 The fundamental unit of life Intext questions as well as end exercise question answers are given below for new academic session 2021-22. To solve your doubts, please join the Discussion Forum and ask the questions. Current users as well as our experts will reply you very soon. Download NCERT Solutions Offline Apps 2021-22 for offline use.
Class 9 Science Chapter 5 Answers in English Medium
9th Science Chapter 5 Answers in Hindi Medium
Class 9 Science Chapter 5 Answers in PDF Form
- Download 9th Science Page 59 Answers
- Download 9th Science Page 61 Answers
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- 9th Science Chapter 5 Exercise Question Answers
- 9th Science Chapter 5 Study Material for 2021-22 in English
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- Class 9 Science Solutions Main Page
Extra Questions on 9th Science Chapter 5
Why are stem cell used in treatment of severe immunodeficiency disorder (SCID) in the children? Give three reasons.
(i) These are capable of dividing for long periods to generate replacement for the cell which that cannot produce adenosine deaminase.
(ii) Stem cells can trigger immune response.
(iii) Stem cells can differentiate into white blood cells against the infectious diseases.
Why is the cell called the structural and functional unit of life?
A cell is a smallest part of the living organisms which is fully alive and is capable of performing basic processes of life like, reproduction and respiration, therefore, it is called the structural and functional unit of life.
Name a single cell which may constitute a whole organism. What are they called?
Amoeba, They are called Unicellular organism.
Every multi-cellular organism has come from a single cell. Justify the statement.
Single cell forms a zygote which is first cell formed after fertilization. It further leads to the formation of large number of cells by cell division.
Which functions are performed by a single cell organism like amoeba?
A single cell takes in food, excrete waste, move, grow and reproduce.
Who discovered the cell and how?
Robert Hooke saw the cork which resembled the structure of a honey comb consisting of many little compartments. He observed these through a microscope. He called these boxes as cell.
Why is plasma membrane called a selective permeable membrane?
It is because it allows only certain material to pass through it and not all the materials.
Can you name the two organelles which contains their own genetic material?
Questions for Practice on 9th Science Chapter 5
How do substances like carbon dioxide and water moves in and out of the cell? Discuss.
It takes place through diffusion from higher concentration to lower concentration across a cell membrane.
Where are proteins synthesized inside the cell?
Packaging, storage and dispatching of the materials, synthesized inside the cell will not take place.
What will happen when a human red blood cells is placed in hypertonic salt/sugar solution?
It will shrink, i.e., plasmolysis will take place.
Important Questions on 9th Science Chapter 5
What would happen if the plasma membrane ruptures or breaks down?
Plasma membrane is a selectively permeable membrane of the cell that maintains its homeostasis, i.e., constant internal composition of the cell. If it ruptures or breaks down the constant internal chemical composition of the cell will be lost and it will not be able to perform its basic functions. Such a cell with ruptured plasma membrane is killed.
What would happen to the life of a cell if there is no Golgi apparatus?
The materials synthesized in the ER are stored, sorted, modified, packaged and dispatched to various targets inside and outside the cell through the Golgi apparatus packs products in vesicles, the secretary vesicles. In some cases complex sugars e.g. cellulose, may be made from simple sugars in Golgi apparatus. The Golgi apparatus is also involved in the formation of the cells which will not be possible if Golgi apparatus is not there.
Which organelle is known as the powerhouse of the cell? Why?
Mitochondria are known as the powerhouse of the cell because they contain enzymes that are needed for stepwise oxidation of food stuffs (carbohydrate, fats and lipids) present in the cells to CO2 and water. Oxidation of food releases energy which is used to form high-energy ATP (adenosine triphosphate) molecules. ATP 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, protein synthesis and muscle contraction.
Where do the lipids and proteins constituting the cell membrane get synthesised?
Rough Endoplasmic Reticulum (RER) – synthesizes proteins constituting cell membrane. Smooth Endoplasmic Reticulum (SER) – synthesizes lipids constituting cell membrane.
How does Amoeba obtain its food?
Amoeba has flexible cell membrane. It enables amoeba to engulf in food by the process called endocytosis.
What is osmosis?
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.