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Important Questions for CBSE Class 8 Science Chapter 8 - Cell Structure and Functions

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Last updated date: 19th Mar 2024
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MVSAT 2024

Cell Structure and Functions Class 8 Important Questions with Solutions: Free PDF Download

Important Questions for Class 8 Science Chapter 8 Cell Structure and Functions with solutions have been created by experts at Vedantu. The important questions PDF will be available for free of cost on the Vedantu site and it covers topic-wise important questions. Cell structure and function Class 8 important questions will help the student to assume the type of questions asked in the exam in chapter 8.


The main concept behind the creation of important questions is that the students should not struggle to prioritise the topics while their exam preparation. and the important questions are created following the recent CBSE guidelines. For better preparations for the examination, students can opt for Class 8 Science tuition available online at Vedantu and can also download other study materials from there. 


Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths students who are looking for better solutions can download Class 8 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.


Topics Covered in Class 8 Science Chapter 8

S.No.

Topics

8.1

Discovery of The Cell

8.2

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 Membrane

8.6

Comparison of Plants And Animal Cells

Study Important Questions for Class 8 Science Chapter 8 – The Cell Structures and Functions

Very Short Answer Questions                                              (1 Mark)

1. Which one of the following is NOT a part of the nucleus? 

  1. ribosome 

  2. nucleolus 

  3. chromosome 

  4. gene 

Ans: A. ribosome 


2. Which one of the following is a unicellular organism? 

  1. amoeba and paramecium 

  2. human 

  3. mouse 

  4. fish

Ans: A. amoeba and paramecium 


3. The basic structural and functional unit of an organ is ________. 

  1. red blood corpuscle (RBC) 

  2. cell 

  3. kidney 

  4. renal tubule 

Ans: B. cell 


4. The green colour of leaves is due to the presence of the pigment _______. 

  1. chlorophyll 

  2. ribosomes 

  3. mitochondria 

  4. chloroplast 

Ans: A. chlorophyll 


5. Who among the following discovered cell? 

  1. Robert Hooke 

  2. Matthias Schleiden 

  3. Theodor Schwann 

  4. Rudolf Virchow 

Ans: A. Robert Hooke 


6. All the multicellular organisms start their life as a ___________. 

  1. single cell 

  2. double cell 

  3. triple cell 

  4. without a cell 

Ans: A. single cell


7. Give any two examples of multicellular organisms. 

Ans: Human, elephant, etc. 


8. Name any two cell organelles. 

Ans: Nucleus, ribosome 


9. What is the substance used to see a cell under the microscope? 

Ans: Stain or dye 


10. What does the amoeba use for locomotion? 

Ans: Pseudopodia


Short Answer Question                                                                                (3 Marks)

1. Define genes and their function.

Ans: The basic physical and functional unit of heredity is the gene. They aid in character inheritance or transfer from parents to offspring.


2. What is a tissue?

Ans: Tissue is a collection of related cells that perform a specific job. Muscle tissue, for example, is made up of muscle cells.


3. What is a nucleus? State the importance of the nucleus.

Ans: The nucleus is the primary dense circular body at the centre. The transport of materials into and out of the cell is regulated by the nucleus. It also regulates the cell's metabolic activity.


4. What is the function of the nuclear membrane?

Ans: The nucleus is separated from the cytoplasm by the nuclear membrane. It also allows materials to flow between the cytoplasm and the nucleus' interior.


5. Why is the cell wall present in plant cells and not in animal cells?

Ans: Plant cells have a cell wall, but animal cells do not, since plants require protection. Plant cells require protection against extremes in temperature, strong wind speeds, and atmospheric moisture, among other things. Because humans are unable to migrate like animals for protection, they are subjected to these changes.


6. What is chloroplast? Define the functions of the chloroplast.

Ans: Chloroplasts are plastids that are green in colour. They give the leaves a bluish-green hue. Photosynthesis requires chlorophyll in the chloroplasts of leaves.


7. Draw a diagram of Onion peel, as observed under a microscope, and label its basic components.

Ans: Diagram of onion peel


Microscopic view of an onion peel.


8. Draw a labelled diagram of an animal cell.

Ans:

Diagram of an Animal cell


9. Why is a cell membrane important to a cell?

Ans: The cell membrane, cytoplasm, and nucleus are the three basic components of a cell. The cell membrane, also known as the plasma membrane, encloses the cytoplasm and nucleus. Cells are separated from one another by membranes, which also separate the cell from the surrounding liquid. The plasma membrane is permeable, allowing substances or materials to pass across it both inward and outward.


10. Draw a labelled diagram of a human cheek cell.

Ans: Diagram of human cheek cell

Diagram of Human cheek cell


11. Define Plastids.

Ans: Plastids are coloured bodies found in a plant's cytoplasm. They are available in a range of colours.


Long Answer Question                                                                        (5 Marks)

1. Define a cell. Explain the variation in cell number, shape and size.

Ans: A cell is an organism's structural and functional unit.

Cell Number: Multicellular organisms are organisms made up of more than one cell. The fact that smaller creatures have fewer cells has no bearing on the organisms' ability to operate. Unicellular organisms are organisms with only one cell. A single-celled creature can carry out all of the functions that multicellular organisms can.

The Shape of Cells: Cells can have an irregular shape, such as an amoeba, or a well-defined shape, such as an RBC. Cells that may change their form include amoeba and WBC. The form of cells might be circular, spherical, or elongated. Some cells are lengthy and have two pointed ends. They have a spindle form to them. Cells can be pretty lengthy at times. Some, like a nerve cell or a neuron, are branching.

Size of Cells: Cells in living things can be as small as a millionth of a metre (micrometre or micron) or as huge as several centimetres. The majority of the cells, however, are minute and invisible to the naked eye. A microscope is required to enlarge or magnify them. In bacteria, the smallest cell measures 0.1 to 0.5 micrometres. The ostrich egg is the biggest cell, measuring 170 mm by 130 mm. The size of the cells has no bearing on the size of the animal or plant's body. The function of a cell is related to its size. For example, the nerve cells of the elephant and rat are lengthy and branching. They both do the same thing: they send and receive messages.


2. Write short notes on the following: 

  1. Cytoplasm 

Ans: The cytoplasm is a jelly-like material that exists between the cell and the nucleus. The cytoplasm possesses a variety of cell organelles. Mitochondria, Golgi bodies, ribosomes, lysosomes, chloroplast, and other cell organelles are examples.

  1. Nucleus

Ans: This is a spherical structure found inside the cell, usually near the cell's centre. A nuclear membrane is a double-layered membrane that encloses the nucleus. Inside the nucleus is a dot-like structure known as the nucleolus. Chromosomes appear as thread-like structures which are found in the nucleus. The transport of materials into and out of the cell is regulated by the nucleus. It also regulates the cell's metabolic activity.


3. State any three differences between plant and animal cells.

Ans: The difference between plant and animal cell is as given below,

Plant cell

Animal cell

There is a cell wall.

There is no cell wall.

There are plastids present.

There are no plastids.

Instead of Golgi body, they have dictyo.

They have Golgi equipment.

There are no centrosomes or centrioles.

There are centrosomes and centrioles present.

The size of vacuoles is bigger.

The size of vacuoles is smaller.

Due to the creation of the cell plate, daughter cells detach from one another.

Daughter cells become separated from each other as a result of contrition or the formation of furrows.


Diagram of a Plant Cell


Diagram of an Animal Cell


What Is Cell in Class 8 Science Chapter 8?

The cell is the basic unit of life. It is a small membrane-bound compartment which contains all the chemicals and molecules that help to support an organism's life. Understanding the structure and function of cells is one of the basic steps to comprehend the complex cellular interactions, which produces life. 


There are two types of cells, namely unicellular and multicellular organisms. Both the organisms have their own uniqueness and functions. Like unicellular organisms have the capability to sustain their life on their own. All the organisms are made up of cells, but the cell differs from one organism to others like from plants to animals. To understand the chapter more in-depth, go through the NCERT solutions of Class 8 Science Chapter 8.


What Are the Benefits of Referring to the Important Questions  for CBSE Class 8 Science Chapter 8?

Solving important questions for CBSE Class 8 Science Chapter 8 can be  helpful for students in the following ways:

  • Students can develop time management skills while solving these questions.

  • These important questions covered  in the pdf are frequently asked in the Class 8 exam. 

  • Practising these questions will give the students a brief idea of how to present the answer in the exam, eventually helping them to fetch more marks.

  • Solving the different types of questions will help students to revise the chapter thoroughly and efficiently a day before the exam.


Extra Important Questions for Practice 

Very Short Answer Type Questions

  1. Who discovered the slices of cork under a simple magnifying device?

  2. Are the cells present in the eggs of a hen can be seen through the naked eyes?

  3. Write one example of a single cell which can change its shape.

  4. What is pseudopodia?

  5. Are the cells in elephants larger than cells in rats?


Short Answer Type Questions

  1. What are prokaryotic and eukaryotic cells?

  2. What is the shape and size of a cell?

  3. Why is there a change in the shape of a cell?

  4. What is cytoplasm?

  5. Who first discovered the cell and when?


Long Answer Type Questions

  1. Explain the structure of the cell.

  2. What are single cells, unicellular cells, and multicellular cells?

  3. Write a short paragraph on the nucleus.


Tips to Study Class 8 Science Chapter 8 Better

The following suggested tips will help you to prepare for the Science Chapter 8 better:

  1. Understand all the concepts of the chapter covered in the NCERT textbook thoroughly. 

  2. Practice the important questions given in this article after understanding the chapter concepts.

  3. Practice all the questions of this chapter that are asked in the NCERT textbook.

  4. Attend test series to check your knowledge and to gain confidence.


Why are Important Questions for Class 8 Science Chapter 8 - Cell Structure and Functions Necessary?

  • Vedantu’s Important Questions for Class 8 Science Chapter 8 - Cell Structure and Functions are the finest material to understand and practice the topics in the best way.

  • The material carries all the information in detail and pointwise.

  • All the cases of the material are solved in the simplest way which explains the term clearly.

  • Vedantu’s Important Questions for Class 8 Science Chapter 8 - Cell Structure and Functions provides all the main topics so that the student can focus on it and prepare for the exam. 


Conclusion

Class 8 Science cell structure and function important questions provide self-confidence to the student in their preparation for the exam. Vedantu provides one of the best study materials free of cost PDF, which helps students in learning all the basics about the chapter.


Important questions for Class 8 Science Chapter 8 cell structure and functions help the student to write short notes on the various parts of the cell such as the nucleus, cytoplasm, etc. The solution given will help us to understand the difference between eukaryotes and prokaryotes. Students will also get knowledge about chromosomes, their location, and other interesting topics.

FAQs on Important Questions for CBSE Class 8 Science Chapter 8 - Cell Structure and Functions

Q1. What are the most important concepts in Chapter 8 of Class 8 Science?

Chapter 8 of Class 8 Science talks about the structure and functions of cells. Vedantu provides students with important questions that are taken from important topics and concepts from this chapter. The solutions for these important questions are given by subject experts making the students understand the solutions in an easy-going way. The important questions PDF are available for free on Vedantu(vedantu.com) chapter-wise and topic-wise. These important questions will even give an idea to the students about the type of questions that can be asked. These solutions can be downloaded from Vedantu mobile app as well.

Q2. Who discovered the cell?

Robert Hooke discovered cells in 1655. He came across this while exploring and examining a cork which is a part of the bark of a tree. Hook observed thin slices of cork under a microscope that he designed himself. Under that, he observed that there were several tiny compartments and partitioned boxes just like a honeycomb. Upon further notice, he could see that each compartment and box are divided from each other by a wall. He later termed all the single compartments and boxes as "cells".

Q3. What are the basics of Chapter 8 Cell Structure and Functions of Class 8 Science?

Cell Structure and Functions is an important chapter for Class 8 Science. This chapter starts by explaining how cells were discovered for the first time. It then moves on to the structure of the cell and its characteristics. This chapter even focuses on the different types of cells and the different number of cells available in the animal and human body as well as in plants. Therefore, it is important to understand this chapter as it will help Students create a fundamental base for similar chapters.

Q4. What are cells?

Cells are generally considered to be the basic unit of life as they are the building blocks of all living matter. It contains many molecules and chemicals. There are two types of cells found. These include multicellular and unicellular organisms. Both these cells have their own unique characteristics and functions. A cell has three main parts namely the nucleus, the cell membrane, and the cytoplasm. Although all living organisms are made up of cells, one cell can differ from another.

Q5. What is the difference between a plant cell and an animal cell?

The main difference between a plant cell and an animal cell is that in an animal cell the cell wall is absent, whereas a plant cell has a rigid cell wall. A plant cell comprises chloroplasts while animal cells don’t have chloroplasts in them. Since an animal cell does not have a cell wall, it comprises a Centrosome that is present near the nucleus. A centrosome refers to a cell organelle which divides the cells. The Centrosome in a plant cell is absent.