Question

Class 8 Science MCQ Questions of Cell Structure and Functions with Answers?

Answer 1

The Class 8 Science MCQ Questions of Cell Structure and Functions with Answers are recognized because of the most useful and widely applicable sort of objective test elements. They might be wont to measure the foremost important educational outcomes, like understanding, knowledge, judgment, and problem-solving. By preparing these Class 8 Science MCQ Questions of Cell Structure and function with Answers once after completing every topic. We will able to attempt the competitive exams like NEET easily and effectively.

There are many Multiple Choice Questions of this Chapter. Allow us to undergo MCQ Question for class 8 Science Score well in exams. We Cover here MCQ Questions of all of the most topics discussed during this chapter. Let us look at the MCQ Questions of cell structure and MCQ Questions of function with answers.

Practice Class 8 Science MCQ Questions chapter-wise

1. Nucleus is separated from the cytoplasm by

(a) nuclear membrane
(b) nuclear envelope 
(c) organs
(d) cell membrane

2. The liquid material in the nucleus is

(a) chromosomes
(b) bacteria
(c) nucleoplasm
(d) nucleolus

3. Tissues combine to form

(a) nucleus
(b) cells
(c) organism
(d) organs

4. Cells that lack nuclear membrane are

(a) eukaryotic cells
(b) prokaryotic cells
(c) single cells
(d) multi cells

5. The control centre of all the activities of a cell is

(a) nucleus
(b) nucleoplasm
(c) cytoplasm
(d) organelles

6. The coloured organelles which are found in plants only are

(a) chlorophyll
(b) plastids
(c) vacuoles
(d) WBC

7. Genes are located in

(a) chromosomes
(b) plastids
(c) cytoplasm
(d) lysosome

8. A group of similar cells combines to form

(a) tissue
(b) organ
(c) organisms
(d) organelles

9. The organism containing only a single cell is called

(a) unicellular organism
(b) multicellular organism
(c) organelle
(d) all of these

10. The empty blank looking structure in the cytoplasm is

(a) vacuoles
(b) plastids
(c) plasma membrane
(d) nucleus

11. The basic structural and functional unit of all living organisms is

(a) cell
(b) cell wall
(c) cell membrane
(d) chloroplasts

12. Which organelle is called the “powerhouse of the cell”?

(a) Nucleus
(b) Endoplasmic reticulum
(c) Mitochondrion
(d) Golgi apparatus

13. Which of the following instruments can be used to observe cells?

(a) Barometer
(b) Microscope
(c) Periscope
(d) Telescope

14. Which of the following scientists discovered cells in cork slices?

(a) Louis Pasteur
(b) Antonie van Leeuwenhoek
(c) Carl Linnaeus
(d) Robert Hooke

15. Which of the following statements is incorrect about the Endoplasmic Reticulum?

(a) It is involved in lipid synthesis
(b)  It is involved in ribosome synthesis
(c) It is the post office of the cell
(d) Involved in detoxifying chemicals

16. Which among the following is not the function of lysosomes?

(a) Breaking down of food particles
(b) Protection against the pathogens
(c) Perform photosynthesis
(d) Digest worn-out cells

17. Assertion (A): Chromosomes are responsible for the transfer of characteristics from parents to offspring.

Reason (R): Chromosomes are present in the nucleus.

(a) Both A and R are true and R is the correct explanation of A
(b) A is true but R is false
(c) A is false but R is true
(d) Both A and R are true but R is not the correct explanation of A

18. Among the following which cell can be seen with an unaided eye?

(a)  Hen’s egg
(b) Red blood cell
(c) Sperm cell
(d) Nerve cell

19. The technique in which cellular components are coloured for better observation is called

(a) Dyeing
(b) Pigmenting
(c) Staining
(d) Colouring

20. I am a double-membraned cell organelle. I produce energy-rich molecules called ATP. I have my own genetic material. Who am I?

(a) Cell membrane
(b) Plastid
(c) Nucleus
(d) Mitochondrion

21. Arrange the following in the ascending order of the number of nuclei present in each of them. Brain cell,paramoecium, RBC of mammals.

(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 have same number of nuclei, i.e., one

22. Which of the following is not a locomotory organelle of protozoans

(a) Pseudopodia
(b) Cilia
(c) Flagella
(d) Parapodia

23. The white part of egg is called:

(a) yolk
(b) albumen
(c) cytoplasm
(d) none of these

24. Which of the following is not a major component of protoplasm:

(a) hydrogen
(b) nitrogen
(c) Sulphur
(d) oxygen

25. Cell wall of bacteria contains :

(a) phospholipid
(b) ribonucleic acid
(c) peptidoglycan
(d) deoxyribonucleic acid

Answer 2

1. Answer: (b) nuclear envelope 

Explanation:  The nuclear envelope separates the contents of the nucleus from the cytoplasm and provides the structural framework of the nucleus.

2. Answer: (c) nucleoplasm

Explanation:  The liquid material in the nucleus is 'nucleoplasm'. Nucleoplasm is a type of protoplasm that is composed of thick fluid and constitutes chromatin fibers made up of DNA and is usually found in the nucleus of the eukaryotic cells.

3. Answer: (d) organs

Explanation:  The collection of similar cells performing specific functions is known as tissue. Cells form tissue, tissues form organs, organs form organ systems, and organ systems form organisms.

4. Answer: (b) prokaryotic cells

Explanation: The cells that lack a nuclear membrane are known as prokaryotic cells.

5. Answer: (a) nucleus

Explanation: The nucleus is an important cell organelle. It contains genetic material and also controls all the activities of a cell.

6. Answer: (b) plastids

Explanation: Plastid is the organelle that is found only in plant cells. The three types of plastids are green plastid, nongreen chromoplast, and leucoplasts.

7. Answer: (a) chromosomes

Explanation: The chromosomes are condensed chromatin. They are made up of DNA and proteins Those sequences of DNA that code for proteins are called genes. 

8. Answer: (a) tissue

Explanation: A tissue is a group of many similar cells (though sometimes composed of a few related types) that work together to perform a specific function. An organ is an anatomically distinct structure of the body composed of two or more tissue types.

9. Answer: (a) unicellular organism

Explanation: Unicellular organisms are made up of one cell that performs all the functions and metabolism of the organism. These are also known to be single-celled organisms.

10. Answer: (a) vacuoles

Explanation: Empty, blank-looking cell organelle in the cytoplasm to store food, water and wastes are Vacuole.

11. Answer: (a) cell

Explanation: The cell is the basic structural and functional unit of life. Whether it is a complex organism like humans, animals or plants or simple organisms like the bacteria, they are all made of cells. So, the cell forms the most basic level of organization of organisms.

12. Answer: (c) Mitochondrion

Explanation: The mitochondrion is called the “powerhouse of the cell” because it is responsible for producing energy-rich ATP molecules. Cells use ATP for all their energy needs.

13. Answer: (b) Microscope

Explanation: A microscope is an optical instrument used to observe objects that are invisible to the naked eye. It is used to view and study cell structure. The science of viewing small objects using a microscope is called microscopy.

14. Answer: (d) Robert Hooke

Explanation: Robert Hooke in 1665 observed thin slices of cork under a simple magnifying device. He observed box-like structures and named them ‘cells’. This is because these structures reminded him of the cells in a monastery.

15. Answer: (c) It is the post office of the cell

Explanation: Golgi apparatus is called the post office of the cell since it is involved in the packaging, processing and transportation of substances.SER (Smooth endoplasmic reticulum) is involved in detoxification and lipid synthesis, while RER is involved in protein synthesis. Ribosomes are not synthesised by the ER.

16. Answer: (c) Perform photosynthesis

Explanation: Lysosomes break down and digest food particles in a cell. They also help the cell to protect itself from pathogens, by forming a complex along with the pathogen, called phagosome. They also aid in recycling proteins and digest worn-out cells. Hence, they are known as the ‘suicidal bags’. But they do not aid in photosynthesis.

17. Answer: (d) Both A and R are true but R is not the correct explanation of A

Explanation: In the nucleus, thread-like structures called chromosomes are present. These carry all the information needed by the cell to function and to reproduce. They are responsible for inheritance i.e., transfer of characteristics from parents to the offspring. Hence, both the statements are correct. Chromosomes being present in the nucleus has nothing to do with their function.

18. Answer: (a)  Hen’s egg

Explanation: Most of the cells are microscopic in size and are not visible to the unaided eye. They need to be enlarged or magnified by a microscope. Some cells are big enough to be seen with the unaided eye. Example of that is a hen’s egg which is considered as a single cell. It can be seen by the naked eye.

19. Answer: (c) Staining

Explanation: Cell staining is the technique of colouring different cellular organelles. It is used to visualise cells and cellular components better under a microscope. By using different stains, one can preferentially stain specific cell components, such as a nucleus, cell wall, or the entire cell.

20. Answer: (d) Mitochondrion

Explanation: Mitochondria are double-membraned cell organelle present in the cytoplasm. They have their own genetic material. They produce ATP, which are energy-rich molecules. Since they produce energy rich molecules, they are called the ‘powerhouse’ of the cell.

21. Answer: (b) RBC of mammals, brain cell, paramoecium

Explanation: RBC of mammals do not contain. nucleus, brain cells contain single nucleus and paramoecium contains two nuclei.

22. Answer: (d) Parapodia

Explanation: The term parapodium refers to two different organs. In annelids, parapodia are paired, un-jointed lateral outgrowths that bear the chaetae.
It is not present in protozoans. The organelles of protozoa have functions similar to the organs of higher animals. The plasma membrane enclosing the cytoplasm also covers the projecting locomotory structures such as pseudopodia, cilia, and flagella.

23. Answer: (b) albumen

Explanation: The egg white is known as the albumen, which comes from albus, the Latin word for “white.” Four alternating layers of thick and thin albumen contain approximately 40 different proteins, the main components of the egg white in addition to water.

24. Answer: (c) Sulphur

Explanation:  Sulphur is not a major component of Protoplasm. Explanation: 99 percentage of protoplasm is made of 4 basic elements. They basic elements are oxygen, carbon, hydrogen and nitrogen.

25. Answer: (c) peptidoglycan

Explanation: The bacterial cell wall consists of peptidoglycan, an essential protective barrier for bacterial cells that encapsulates the cytoplasmic membrane of both Gram-positive and Gram-negative bacterial cells. Peptidoglycan is a rigid, highly conserved, complex structure of polymeric carbohydrates and amino acids.

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