MCQ Questions for Class 8 Science: Ch 8 Cell Structure and Functions

1.Which of the following cells can change its shape

(a) White blood cell

(b) Egg cell

(c) Red blood cell

(d) All of the above

► (a) White blood cell

2. What are pseudopodia?

(a) Eye of amoeba

(b) False feet of amoeba

(c) Heart of amoeba

(d) Vacuole of amoeba

► (b) False feet of amoeba

3. Vacuoles of plant cells are

(a) permanent

(b) semi-permanent

(c) temporary

(d) impermeable

► (a) permanent

4. Tissue is a       

(a) Group of organs       

(b) Group of cells       

(c) Group of tissues       

(d) Group of organisms

► (b) Group of cells       

5. Which of the following is a saclike structure that store food, wastes and water?

(a) Lysosomes

(b) Centrosomes

(c) Chromosomes

(d) Vacuoles

► (d) Vacuoles

6. Which of the following is absent in an animal cell?

(a) Cytoplasm

(b) Nucleus

(c) Cell membrane

(d) Cell wall

► (d) Cell wall

7. Which of the following given below is in the ascending order of the number of nuclei present in cells?

(a) Paramoecium, brain cell, RBC of mammals.

(b) RBC of mammals, brain cell, paramoecium.

(c) Brain cell, RBC of mammals, paramoecium.

(d) All of these

► (b) RBC of mammals, brain cell, paramoecium.

8. Power house of the cell is :

(a) mitochondria

(b) chloroplast

(c) ribosome

(d) nucleus

► (a) mitochondria

9. Which of the following tissues include blood cell?

(a) Epithelial tissue

(b) Muscle tissue

(c) Connective tissue

(d) Nervous tissue

► (c) Connective tissue

10. Which type of tissues support, defend and store food in animals?

(a) Epithelial

(b) Connective

(c) Nervous

(d) Muscular

► (b) Connective

11. Membrane of nucleus is porous so it :

(a) allows movement of chromosomes out of nucleus

(b) allows exchange of cell organelles

(c) allows transport of specific proteins

(d) allows leakage of genes into cytoplasm

► (c) allows transport of specific proteins

12. Thread like structures present inside nucleus are :

(a) chromosomes

(b) ribosomes

(c) lysosomes

(d) all of them

► (a) chromosomes

13. Identify the statement which is true for cells.

(a) Cells can be easily seen with naked eyes.

(b) Insect’s egg is not a cell.

(c) A single cell can perform all the functions in a unicellular organism.

(d) The size and shape of cells is uniform in multicellular organisms

► (c) A single cell can perform all the functions in a unicellular organism.

14. Cell wall of bacteria contains :

(a) phospholipid

(b) ribonucleic acid

(c) peptidoglycan

(d) deoxyribonucleic acid

► (c) peptidoglycan

15. If your father has brown eyes, you may also have brown eyes. If your mother has curly hair, you might also end up having curly hair. This transfer of characteristics is due to the transfer of ______.

(a) Mitochondria

(b) Chromosomes

(c) Lysosomes

(d) Chloroplasts

► (b) Chromosomes

16. Which of the following is the control room of the cell?

(a) Nucleus

(b) Protoplasm

(c) Chloroplast

(d) Ribosome

► (a) Nucleus

17. Which of the following is a locomotory organelle in protozoa ?

(a) pseudocoelom

(b) tentacles

(c) flagella

(d) all of them

► (c) flagella

18. Which of the following components is/ are present in the nervous system?

(a) Brain

(b) Spinal cord

(c) Cranial and spinal nerves

(d) All of these

► (d) All of these

19. Cell membrane is also called:

(a) cell wall

(b) nucleolus

(c) cytoplasm

(d) Plasma membrane 

► (d) Plasma membrane 

20. The power house of cell is called

(a) Cell wall

(b) Mitochondria

(c) Ribosomes       

(d) Nucleus

► (b) Mitochondria

21. Which of the following statements is/are the functions of golgi apparatus?

(a) Transporting proteins that are to be released from the cell

(b) Packaging proteins into vesicles.

(c) Altering or modifying proteins.

(d) All of these

► (b) Packaging proteins into vesicles.

22. Single celled organisms are called

(a) Unicellular

(b) Multicellular

(c) Both of these

(d) None of these

► (a) Unicellular

23. The plastid responsible for fruit colour is :

(a) chromoplast

(b) amyloplast

(c) chloroplast

(d) leucoplast

► (a) chromoplast

24. Cell is discovered by

(a) Robert Brown

(b) Robert Hooke

(c) John Mendal

(d) Charles Darwin

► (b) Robert Hooke

25. Which of the following is selectively permeable?

(a) cell membrane

(b) cell wall

(c) plasmid membrane

(d) capsule

► (a) cell membrane

Class 8 Science Chapter 8 Extra Questions and Answers Cell Structure and Functions

Extra Questions for Class 8 Science Chapter 8 Cell Structure and Functions with Answers Solutions

Cell Structure and Functions Class 8 Extra Questions Very Short Answer Type

Question 1.
What is the basic, functional and structural unit of life?
Answer:
Cell

Question 2.
Which cell does not have nucleus?
Answer:
Red blood cell

Question 3.
What is the name of the organism which can be seen only with the help of microscope?
Answer:
Microorganisms

Question 4.
What are the organisms which are composed of many cells packed together called?
Answer:
Multicellular organisms

Question 5.
What is the name of the power house of the cell?
Answer:
Mitochondria

Question 6.
Name one example of prokaryotic cell.
Answer:
Blue-green algae

Question 7.
Amoeba and Paramecium belong to which category of organisms?
Answer:
Unicellular

Question 8.
Which instrument is used to observe cells?
Answer:
Micrbscope

Question 9.
Why we do not sense any pain when we cut nails and hair?
Answer:
Nails and hair are made up of dead cells.

Question 10.
What is the name of living substance present in cell?
Answer:
Protoplasm

Question 11.
What is the other name of cell membrane?
Answer:
Plasma membrane

Question 12.
What is the name of thread-like structure present in nucleoplasm?
Answer:
Chromatin

Question 13.
What is the name of cell which has a well-defined nucleus?
Answer:
Eukaryotic cell

Question 14.
Name the two types of cell.
Answer:
Prokaryotic cells and eukaryotic cells.

Cell Structure and Functions Class 8 Extra Questions Short Answer Type

Question 1.
What is the function of cell wall?
Answer:
Cell wall is a tough, rigid layer that surrounds some types of cells (plants and some bacterial cells). The major function of the cell wall is to provide rigidity, tensile strength, structural support, protection against mechanical stress and infection.

Question 2.
Name the parts of the nucleus and state its function.
Answer:
Nucleus consists of three main parts nuclear membrane, nucleoplasm and nucleolus. Nucleus plays an important role during cell division. It also controls the activities of the cell.

Question 3.
What is an organ?
Answer:
The structure that contains more than one type of tissues and is visible to the naked eyes are called organs.

Question 4.
What do you mean by unicellular and multicellular organisms?
Answer:
Organisms which consists of only one cell are called unicellular organisms while the organisms made up of more than one cell are called multicellular organisms.

Question 5.
Give a brief description of nucleus.
Answer:
Nucleus is a dense round body found in the centre of an animal cell and mostly on the periphery of the plant cell. The nucleus controls all the activities in a cell.

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Question 6.
Name the following:
(i) Controls the function of a cell.
(ii) Selectively allows things to get in and out of the cell.
(iii) Transfer characters from parents to offsprings.
Answer:
(i) Nucleus
(ii) Cell membrane
(iii) Genes

Question 7.
What is nucleolus?
Answer:
A spherical body present at the centre of the nucleus is called the nucleolus.

Question 8.
What is endoplasmic reticulum?
Answer:
It is the system of complex folded network of membranous tubes which connects nuclear membrane with the plasma membrane. They allow movement of substances within the cell.

Question 9.
What are cell organelles?
Answer:
The tiny components present in the cytoplasm are called cell organelles.

Question 10.
What is cell membrane?
Answer:
The thin and delicate membrane surrounding the cell cytoplasm is called cell membrane.

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