MCQs Questions on Cell Structure and Function Class 8
MCQs Questions on Cell Structure and Function Class 8: Get Chapter Wise NCERT MCQ Questions for Class 8 science with Answers PDF Free Download prepared according to the latest CBSE syllabus. Science MCQs for Class 8 science chapter 8 cell structure and function pdf for all competitive exam. It covers all the important topics of Class 8 science chapter 8 MCQs for Preparation of CBSE class 8 Board Exam. So that students can just click on the desired Chapter and get number of MCQs which has already appeared in the CBSE board examination and are most likely to appear in the Next Examination.
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MCQs Questions on Cell Structure and Function Class 8
1. Cell Membrane is composed of_____________
(1) Proteins and cellulose
(2) Proteins and Phospholipid
(3) Proteins and carbohydrates
(4) Proteins, Phospholipid and some carbohydrates
Answer: (4) Proteins, Phospholipid and some carbohydrates
Explanation: The cell membrane (plasma membrane) is mainly composed of a phospholipid bilayer embedded with proteins. Carbohydrates are also present and play a role in cell recognition and communication.
2. Cell Wall is present in_____________
(1) Plant cell
(2) Prokaryotic cell
(3) Algal cell
(4) All of the above
Answer: (4) All of the above
Explanation: Cell walls are found in plant cells (cellulose), prokaryotic cells (peptidoglycan), and algal cells (varied polysaccharides). It provides structural support and protection.
3. Plasma membrane is_______________
(1) Selectively permeable
(2) Permeable
(3) Impermeable
(4) Semipermeable
Answer: (1) Selectively permeable
Explanation: The plasma membrane allows only certain substances to pass through while blocking others, making it selectively permeable. This controls the cell’s internal environment.
4. Mitochondria DNA is______________
(1) Naked
(2) Circular
(3) Double stranded
(4) All of the above
Answer: (4) All of the above
Explanation: Mitochondrial DNA is circular, double-stranded, and not associated with histones, hence referred to as naked DNA. It allows mitochondria to perform some autonomous functions.
5. Which of the following set of organelles contain DNA_______________
(1) Mitochondria, Peroxysome
(2) Plasma membrane, ribosome
(3) Mitochondria, chloroplast
(4) Chloroplast, dictyosome
Answer: (3) Mitochondria, chloroplast
Explanation: Both mitochondria and chloroplasts are semi-autonomous organelles that contain their own DNA, enabling them to synthesize some of their proteins independently.
6. Golgi body is absent in______________
(1) Prokaryotes
(2) Mature mammalian RBC
(3) Akaryotes
(4) All of the above
Answer: (4) All of the above
Explanation: The Golgi body is absent in prokaryotes (no membrane-bound organelles), mature mammalian RBCs (lack organelles), and akaryotic cells (cells without a nucleus and organelles).
7. Who discovered cell in 1665?
(1) Robert Hook
(2) Robert Crook
(3) David Thomson
(4) Marie Francois
Answer: (1) Robert Hook
Explanation: Robert Hooke discovered cells in 1665 while observing cork slices under a microscope. He coined the term “cell” to describe the box-like structures.
8. Name the outermost boundary of the cell?
(1) Plasma membrane
(2) Cytoplasm
(3) Nuclear membrane
(4) None of the above
Answer: (1) Plasma membrane
Explanation: In animal cells, the plasma membrane is the outermost boundary. In plant and prokaryotic cells, it’s the second outermost layer after the cell wall.
9. _____________ is involved in the synthesis of phospholipids.
(1) Mitochondria
(2) Cytoplasm
(3) Endoplasmic Reticulum
(4) Smooth Endoplasmic Reticulum
Answer: (4) Smooth Endoplasmic Reticulum
Explanation: Smooth ER is primarily responsible for lipid and phospholipid synthesis, detoxification, and steroid hormone production in eukaryotic cells.
10. Which among the following sentence is not correct about the organelles?
(1) They are found in all Eukaryotic cells.
(2) They are found in multicellular organisms.
(3) They coordinate to produce the cell.
(4) They are small sized and mostly internal.
Answer: (1) They are found in all Eukaryotic cells.
Explanation: Some specialized eukaryotic cells like mature RBCs do not contain organelles. Hence, the statement is not universally true and is considered incorrect.
11. Which of the following cell organelles is called the powerhouse of the cell?
(1) Nucleus
(2) Lysosomes
(3) Chloroplast
(4) Mitochondria
Answer: (4) Mitochondria
Explanation: Mitochondria are known as the powerhouse of the cell because they generate ATP (adenosine triphosphate), the energy currency of the cell, through cellular respiration.
12. The jelly-like substance present inside the cell is known as________
(1) Cytoplasm
(2) Ectoplasm
(3) Nucleoplasm
(4) None of the above
Answer: (1) Cytoplasm
Explanation: The cytoplasm is the semi-fluid, jelly-like substance that fills the cell and surrounds the organelles. It is the site of many biochemical reactions.
13. Which of the following statements is true about the Nucleus?
(1) It is absent in prokaryotes
(2) It is called the brain of the cell
(3) It contains DNA and other genetic materials.
(4) All of the above
Answer: (4) All of the above
Explanation: The nucleus is absent in prokaryotic cells, acts as the control center of the cell (brain), and contains DNA, RNA, and chromatin material for heredity and regulation.
14. The membrane around the vacuole is known as__________
(1) Tonoplast
(2) Elaioplast
(3) Cytoplast
(4) Amyloplast
Answer: (1) Tonoplast
Explanation: Tonoplast is the membrane that surrounds the central vacuole in plant cells. It helps regulate ion movement and maintains cell turgor pressure.
15. _____________ is the study of the cell, its types, structure, functions and its organelles.
(1) Cell Biology
(2) Biology
(3) Microbiology
(4) Biotechnology
Answer: (1) Cell Biology
Explanation: Cell biology is the branch of biology that deals with the study of cells, including their structure, function, life cycle, and interaction with their environment.
16. Microfilaments are composed of a protein called____________
(1) Tubulin
(2) Actin
(3) Myosin
(4) Chitin
Answer: (2) Actin
Explanation: Microfilaments, part of the cytoskeleton, are made up of the protein actin. They are involved in cell movement, division, and shape maintenance.
17. Which one of the following is not a constituent of cell membrane?
(1) Glycolipids
(2) Phospholipids
(3) Proline
(4) Cholesterol
Answer: (3) Proline
Explanation: Proline is an amino acid and not a component of the cell membrane. The membrane is mainly composed of phospholipids, proteins, cholesterol, and glycolipids.
18. The main organelle involved in modification and routing of newly synthesised proteins to their destination is_________
(1) Mitochondria
(2) Endoplasmic reticulum
(3) Lysosome
(4) Chloroplast
Answer: (2) Endoplasmic reticulum
Explanation: The rough endoplasmic reticulum (RER) modifies and transports newly synthesized proteins, especially those destined for secretion or membrane integration.
19. Microtubules are constituents of_________
(1) Centrosome, nucleosome and centrioles
(2) Cilia, flagella and peroxisomes
(3) Spindle fibres, centrioles and cilia
(4) Centrioles, spindle fibres and chromatin
Answer: (3) Spindle fibres, centrioles and cilia
Explanation: Microtubules form the structural components of spindle fibres (for cell division), centrioles (for mitotic spindle formation), and cilia (for movement).
20. A cell organelle containing hydrolytic enzyme________
(1) Lysosome
(2) Ribosome
(3) Mesosome
(4) Microsome
Answer: (1) Lysosome
Explanation: Lysosomes contain hydrolytic enzymes that break down waste materials, damaged organelles, and foreign substances. They are also called the “suicide bags” of the cell.
21. The main arena of various types of activities of a cell is__________
(1) Plasma membrane
(2) Nucleus
(3) Cytoplasm
(4) Mitochondrion
Answer: (3) Cytoplasm
Explanation: The cytoplasm is the site where most cellular activities occur, such as metabolic pathways, protein synthesis, and cell expansion. It contains enzymes, organelles, and various cell components.
22. Select the mismatch:
(1) Gas vacuoles – Green bacteria
(2) Large central vacuoles – Animal cells
(3) Protists – Eukaryotes
(4) Methanogens – Prokaryotes
Answer: (2) Large central vacuoles – Animal cells
Explanation: Large central vacuoles are characteristic of plant cells, not animal cells. Animal cells may have small, temporary vacuoles. Hence, this is a mismatch.
23. Water soluble pigments found in plant cell_________
(1) Anthocyanins
(2) Chlorophylls
(3) Xanthophylls
(4) Carotenoids
Answer: (1) Anthocyanins
Explanation: Anthocyanins are water-soluble pigments found in the vacuoles of plant cells. They are responsible for red, purple, and blue colors in flowers, fruits, and leaves.
24. Mitochondria and chloroplast are________
(1) Semi-autonomous organelles
(2) Formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery
Which one of the following options is correct?
(1) Both (a) and (b) are false
(2) Both (a) and (b) are correct
(3) (b) is true but (a) is false
(4) (a) is true but (b) is false
Answer: (4) (a) is true but (b) is false
Explanation: Mitochondria and chloroplasts are semi-autonomous and formed by division of pre-existing organelles. However, they do have their own protein-synthesizing machinery including ribosomes, so statement (b) is false.
25. The Golgi complex participates in_________
(1) Respiration in bacteria
(2) Formation of secretory vesicles
(3) Fatty acid breakdown
(4) Activation of amino acid
Answer: (2) Formation of secretory vesicles
Explanation: The Golgi apparatus modifies, packages, and sorts proteins and lipids into vesicles for secretion or delivery to other organelles.
26. Which of this is/are examples of an organ containing a smooth muscle?
(1) Iris of eye
(2) Bronchi only
(3) Uterus only
(4) All of the above
Answer: (4) All of the above
Explanation: Smooth muscles are found in the walls of hollow organs like the iris of the eye, bronchi (lungs), uterus, and digestive tract. They are involuntary and non-striated.
27. The main difference between human cheek cells and onion peel cells is_______
(1) Presence of cell wall in onion peel cells
(2) Presence of mitochondria in onion peel cells
(3) Absence of endoplasmic reticulum in cheek cells
(4) Absence of the plasma membrane in cheek cells
Answer: (1) Presence of cell wall in onion peel cells
Explanation: Onion peel cells (plant cells) have a rigid cell wall, while cheek cells (animal cells) do not. Both have mitochondria, ER, and plasma membranes.
28. Animal cells are interconnected by____________
(1) Plasma membrane
(2) Cell wall
(3) Desmosomes
(4) Plasmodesmata
Answer: (3) Desmosomes
Explanation: Desmosomes are specialized cell structures that function in cell-to-cell adhesion in animal tissues. Plasmodesmata are found in plant cells, not animal cells.
29. The Cell theory is not applicable to______________
(1) Fungi
(2) Algae
(3) Virus
(4) Microbes
Answer: (3) Virus
Explanation: Viruses are not made of cells and cannot carry out metabolism or reproduce on their own. Therefore, they are not considered living cells and are excluded from cell theory.
30. The rRNA is synthesized by _________
(1) Golgi body
(2) Nucleus
(3) Nucleolus
(4) Cytoplasm
Answer: (3) Nucleolus
Explanation: The nucleolus, found within the nucleus, is the site where ribosomal RNA (rRNA) is synthesized and ribosomal subunits are assembled.
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