Here, in this article, we bring you Class 8 Science Solutions Chapter 8. All the questions have been solved by top teachers and experts at Embibe. These solutions will help you in quick revision of the chapter as well as in your homework.
NCERT Solutions For Class 8 Science Chapter 8: Cell: Structure And Functions
We have provided here the NCERT solutions for class 8 science chapter 8 along with a direct link to the NCERT solutions for class 8 science chapter 8 extra questions PDF download free to help the students prepare well for the exam. Finding the right solutions usually turns into a grueling task with a plethora of links available on the Internet. If you have also been struggling with the same issue then look no further. The NCERT solutions for class 8 science chapter 8 Friction PDF along with the NCERT solutions for class 8 science chapter 8 PDF download can easily be downloaded from the embibe platform who are looking for authentic textbooks to download.
Prior to getting into the detailed Class 8 NCERT Solutions for Science Chapter 8, let us bring you an overview of the list of topics and subtopics in this chapter:
|8.1||Discovery of the Cell|
|8.3||Organisms show Variety in Cell Number, Shape, and Size|
|8.4||Cell Structure and Function|
|8.5||Parts of the Cell|
|8.6||Comparison of Plant and Animal Cells|
NCERT Solutions For Class 8 Science Chapter 8 PDF Download
Students can download the solutions for Class 8 Science Cell: Structure and Functions Chapter as a PDF from here. Having knowledge of the Cells and Nucleus is essential for you. As you solve the questions of CBSE Class 8 Science Chapter 8 NCERT book, you will get to know more about the different types of cells as well as its different parts.
Download CBSE Class 8 Solutions for Science for other chapters from the table below:
- Chapter 1 – Crop Production and Management
- Chapter 2 – Microorganisms: Friend and Foe
- Chapter 3 – Synthetic Fibres and Plastics
- Chapter 4 – Materials: Metals and Non-Metals
- Chapter 5 – Coal and Petroleum
- Chapter 6 – Combustion and Flame
- Chapter 7 – Conservation Of Plants And Plants
- Chapter 9 – Reproduction in Animals
- Chapter 10 – Reaching the Age of Adolescence
- Chapter 11 – Force and Pressure
- Chapter 12 – Friction
- Chapter 13 – Sound
- Chapter 14 – Chemical Effects of Electric Current
- Chapter 15 – Some Natural Phenomena
- Chapter 16 – Light
- Chapter 17 – Stars and the Solar System
- Chapter 18 – Pollution of Air and Water
Class 8 Science Chapter 8 – Cell: Structure And Functions Chapter Summary
Let us have a revision of Class 8 Science Chapter 8 – Cell: Structure and Functions here. These science revision notes will help you with last-minute revision.
What is a cell?
It is a basic structural unit of an organ. They are assembled to make the body of every organism.
Robert Hooke discovered cells in 1665 by observing thin slices of cork under a microscope.
The human body has trillions of cells that vary in shape and size. Different groups of cells perform a variety of functions.
Difference between Unicellular and Multicellular Organisms.
|Unicellular Organism||Multicellular Organism|
|Organisms made up of a single cell are called unicellular organisms.||Organisms made of more than one cell are called multicellular organisms.|
|They are irregular in shape.||They have a definite shape.|
|A single cell is responsible to carry out all the functions of the body.||Multiple cells carry out different functions of the body.|
|Example: Amoeba, paramecium, Bacteria, yeast, fungi||Example: Human, animals, birds, plants, insects|
Shape of Cells:
In unicellular organisms like the amoeba, cells have no definite shape. It keeps on changing its shape. Some projections of varying length protrude out of its body. These are called pseudopodia or false feet.
However, in multicellular organisms, cells can have the following shapes
- – Round or spherical: like red blood cells of humans
- – Long and pointed at both ends, i.e. spindle-shaped: like muscle cells
- – Long and branched: like nerve cell or neuron
What are the different functions of a cell?
Cells performing similar kinds of functions combine together to form tissues. And tissues further form an organ.
Each organ in the system performs different functions such as digestion, assimilation, and absorption.
Parts of the Cell:
The basic components of a cell are cell membrane, cytoplasm, and nucleus. All the parts of the cell are described as follows:
- – Cytoplasm and nucleus are enclosed inside the cell membrane.
- – It is also known as the plasma membrane.
- – The membrane separates cells from one another.
- – It gives shape to the cell.
- – The plasma membrane is porous and allows the movement of substances both inward and outward.
- – It is present at the center of the cell.
- – It is dense and round in shape.
- – Nucleus is separated from the cytoplasm by a membrane called the nuclear membrane.
- – Nuclear membrane is porous and allows the movement of material between the cytoplasm and inside of the nucleus.
- – Nucleus also contains thread-like structures called chromosomes. They carry genes and help in the inheritance or transfer of characters from the parents to the offspring.
- – Nucleus also acts as a control center of activities of the cell.
Cytoplasm: It is a jelly-like substance present between the nucleus and the cell membrane.
Cell wall: It is the additional outer thick layer in the plant cell.
Difference between Prokaryotic and Eukaryotic Cell
|Prokaryotic Cell||Eukaryotic Cell|
|The nucleus is not well organized.||They have a well-organized nucleus.|
|The nuclear membrane is absent.||A nuclear membrane is present.|
|Organisms with this kind of cells are called prokaryotes.||Organisms with this kind of cells are called eukaryotes.|
|For example, bacteria and blue-green algae||For example, human cell (all organisms other than bacteria and blue-green algae are eukaryotes)|
- – They are bubble-like structures found inside the cell.
- – Plant cells have a large vacuole whereas animal cells have a very small vacuole.
- – It stores food and a variety of nutrients that a cell might need to survive.
- – They might also store waste products to protect the other cells from contamination.
- – Coloured bodies called plastids are present only in the plant cells.
- – Some plastids contain a green-colored pigment called chlorophyll.
- – They are responsible for the green color of the plants.
Chloroplasts: Green colored plastids are known as chloroplasts.
FAQs Related To NCERT Solutions For Class 8 Science Chapter 8
Here we have provided some of the frequently asked questions:
(a) Unicellular organisms have one-celled body. (T/F)
(b) Muscle cells are branched. (T/F)
(c) The basic living unit of an organism is an organ. (T/F)
(d) Amoeba has irregular shape. (T/F)
A: Various cell organelles are present in the cytoplasm. It is a clear and colourless fluid that contains organelles like Mitochondria, Ribosomes, Golgi bodies.
A: The differences between eukaryotes and prokaryotes are tabulated below:
A: Chloroplasts are plastids required for the food making process, called photosynthesis, and thus they are only present in plant cells.
A: The nucleus is a double-membrane bound cell organelle present in eukaryotic cells. It contains the DNA, the genetic material. It is the command centre of the cell and is spherical in shape.
Students can also refer to the NCERT solutions for class 8 science chapter 8 PDF download or NCERT solutions for class 8 science chapter 9 and NCERT solutions for class 8 science chapter 8 extra questions based on their requirements to prepare well for the exam in an efficient way.
This article on Class 8 Science Solutions Chapter 8 – Cells: Structure and Functions will assist you in clearing your doubts that might come across your mind when preparing for the exam. It is advisable to stay away from rote learning. These solutions will help you in absorbing the chapter better. Also, solving them will aid you in understanding the paper pattern as well as help you manage your speed and time.
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