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Class 11 MCQ Questions of Cell The Unit of Life with Answers

When all is said in done, the Class 11 Biology MCQ Questions of Cell The Unit of Life with Answers are perceived as the most helpful and generally material sort of target test components. MCQ Questions of Cell The Unit of Life with Answers could be utilized to quantify the main educational results like understanding, knowledge, judgment, and problem-solving.

By preparing up these MCQ Questions for Class 11 Biology once subsequent to finishing each topic, We can ready to endeavor the board exams and competitive exams like NEET effectively and successfully.

A cell is the primary and utilitarian unit of life. In Biology Cell manages the study of the structure and functions of cells. It is worried about the life processes, signaling pathways, physiological properties, metabolic properties, chemical properties, and the association of cells with their environmental factors.

Given beneath are few MCQ Questions for Class 11 which will assist the understudies to analyse their conceptual knowledge. The appropriate responses are additionally accommodated for your reference.

Practice MCQ Questions for class 11 Biology

1. The cytoplasmic connections from cell to cell are known as

(a) middle lamella
(b) plasmodesmata
(c) cell membrane system
(d) endoplasmic reticulum

2.  Bacterial flagella is made up of

(a) tubulin
(b) flagellin
(c) chitin
(d) None of these

3. Plasmolysis occurs due to-

(a) Absorption
(b) Endosmosis
(c) Osmosis
(d) Exosmosis

4. Which is called Suicidal Bag?

(a) Centrosome
(b) Lysosome
(c) Mesosome
(d) Chromosome

5. Cell secretion is done by-

(a) Plastids
(b) ER
(c) Golgi apparatus
(d) Nucleolus

6. The outer layer of vacuole is called

(a) tonoplast
(b) leucoplast
(c) cell wall
(d) plasmalayer

7. Most abundant lipid in the cell membrane is

(a) phospholipids
(b) cerebrosides
(c) glycolipids
(d) None of these

8. Smooth endoplasmic reticulum is well developed in the cells which synthesize

(a) steorids
(b) carbohydrates
(c) proteins
(d) all of these

9. Quasi-fluid nature of membrane is due to

(a) Phospholipid
(b) Peripheral protein
(c) Integral protein
(d) Sugar moiety

10.Magnification of compound microscope is not connected with

(a) numerical aperture
(b) focal length of objective
(c) focal length of eye piece
(d) tube length

11. Binding of specific protein on regulatory DNA sequence can be studied by means of

(a) ultra centrifugation
(b) electron microscope
(c) light microscope
(d) X-rays crystallography

12. Gel electrophoresis is used for 

(a) cutting of DNA into fragments
(b) separation of DNA fragments according to their size
(c) construction of recombinant DNA by joining with cloning vectors
(d) isolation of DNA molecule

13. Peroxysomes contain:

(a) Hydrolytic enzyme
(b) Transferase
(c) Isomerase
(d) Oxidising enzyme (Oxidase)

14. The stacks of closely packed thylakoids is called

(a) Lumen
(b) Matrix
(c) Stroma
(d) Granum

15. Which of the following is present in both prokaryotic and eukaryotic cells?

(a) Mitochondria
(b) Endoplasmic reticulum
(c) Nucleus
(d) Ribosomes

16. Plastids which store fats and oils are called:-

(a) Aleuroplast
(b) Amyloplast
(c) Etioplast
(d) Elaioplast

17. If the centromere is situated close to the end of a chromosome, it is called as:

(a) Metacentric
(b) Submetacentric
(c) Acrocentric
(d) Telocentric

18. Prokaryotic cells have something unique in the form of:

(a) Inclusion bodies
(b) Plasmids
(c) Cell wall
(d) 70 S ribosomes

19. Gas vacuoles allow cyanobacteria to:

(a) Store carbon dioxide for assimilation
(b) Control their buoyancy
(c) Provide anaerobic conditions to nitrogenase
(d) Eliminate toxic ammonia

20. The lipid component of the plasma membrane mainly consists of:

(a) Triglycerides
(b) Cholesterol
(c) Phosphoglycerides
(d) Proteins

21. Microbodies, which help to convert stored lipids into carbohydrates so they can be used for plant growth, are known as:

(a) Peroxisomes
(b) Sphaerosomes
(c) Glyoxysomes
(d) Lysosomes

22. Which cell organelle is involved in apoptosis?

(a) Lysosome
(b) ER
(c) Golgi
(d) Mitochondria

23.  The rRNA is Synthesized by ………………

(a) Golgi body
(b) Nucleus
(c) Nucleolus
(d) Cytoplasm

24. The arrangement of outer and central microtubules in a cilium is called the:

(a) 9 + 1 pattern
(b) 9 + 0 pattern
(c) Flagellin pattern
(d) 9 + 2 pattern

25. Pigment-containing membranous extensions in some cyanobacteria are

(a) heterocysts
(b) basal bodies
(c) pneumatophores
(d) chromatophores


1. Answer: (b) plasmodesmata

Explanation: – The cytoplasmic connection from cell to cell is known as plasmodesmata, while in animal cells it is known as gap junction.

2. Answer: (b) flagellin

Explanation: – The bacterial flagellum is made up of the protein flagellin. Its shape is a 20-nanometer-thick hollow tube. It is helical and has a sharp bend just outside the outer membrane; this “hook” allows the axis of the helix to point directly away from the cell.

3. Answer: (d) Exosmosis

Explanation: – Plasmolysis occurs due to Exosmosis in which the water molecules move from the region of higher concentration to the region of lower concentration of the cell around the surroundings through the cell membrane.

4. Answer: (b) Lysosome

Explanation: – Lysosomes are called suicide sacks. They are produced by the Golgi body. They consist of a single membrane surrounding powerful digestive enzymes. It acts as the “garbage disposal” of the cell by breaking down cell components that are no longer needed as well as molecules or even bacteria that are ingested by the cell.

5. Answer: (c) Golgi apparatus

Explanation: – Cell secretion is done by golgi apparatus. The external elimination of substances produced by the cell is known as cell secretion e.g., hormones, sweat, etc. Golgi apparatus is also known as the golgi complex.

6. Answer: (a) tonoplast

Explanation: – The outermost covering of vacuole is called as tonoplast or vacuolar membrane. The tonoplast is the cytoplasmic membrane separating the vacuolar contents from the cell’s cytoplasm.

7. Answer: (a) phospholipids

Explanation: – The most abundant membrane lipids are the phospholipids. These have a polar head group and two hydrophobic hydrocarbon tails. The tails are usually fatty acids, and they can differ in length (they normally contain between 14 and 24 carbon atoms).

8. Answer: (a) steorids

Explanation: – The smooth endoplasmic reticulum functions in many metabolic processes. It synthesizes lipids, phospholipids as in plasma membranes, and steroids. Cells that secrete these products, such as cells of the testes, ovaries, and skin oil glands, have an excess of smooth endoplasmic reticulum.

9. Answer: (a) Phospholipid

Explanation: – It is a mosaic of molecules like lipids (primarily phospholipids), proteins, carbohydrate moiety and cholesterol.It suggests that the fluid nature of the plasma membrane is because of the phospholipids.Phospholipids of plasma membranes are amphipathic structures.

10. Answer: (a) numerical aperture

Explanation: – Magnification of compound microscope is not connected with numerical aperature.

11. Answer: (d) X-rays crystallography

Explanation: – X -rays crystallography is a technique which is used to study of binding protein on regulatory DNA sequence. In this technique, X-rays pass through a crystal of a substance and form a diffraction pattern.

12. Answer: (b) separation of DNA fragments according to their size

Explanation: – Gel electrophoresis is a laboratory method used to separate mixtures of DNA, RNA, or proteins according to molecular size. In gel electrophoresis, the molecules to be separated are pushed by an electrical field through a gel that contains small pores.

13. Answer: (d) Oxidising enzyme (Oxidase)

Explanation: -Peroxisomes contain at least 50 different enzymes, which are involved in a variety of biochemical pathways in different types of cells. Peroxisomes originally were defined as organelles that carry out oxidation reactions leading to the production of hydrogen peroxide.

14. Answer: (d) Granum

Explanation: – The stacks or closely packed thylakoids is called granum. Chlorophyll is present inside the thylakoidsto perform photosynthesis in plant cells.

15. Answer: (d) Ribosomes

Explanation: -‘Ribosome is an organelle which is found in both the type of cells that are eukaryotic and prokaryotic cells’. Note: They are located in two areas of cytoplasm.

16. Answer: (d) Elaioplast

Explanation: – Plastids which store fats and oils are called as elaioplast. Elaioplasts are a type of leucoplast that is specialized for the storage of lipids in plants. Elaioplasts house oil body deposits as rounded plastoglobuli, which are essentially fat droplets.

17. Answer: (c) Acrocentric

Explanation: – The centromere which is located near the end of the chromosome is called the Acrocentric chromosome. There are 5 pairs of acrocentric chromosomes in the human body. It is a sub-terminal centromere. The shape of the acrocentric chromosome is rod or i-shaped.

18. Answer: (a) Inclusion bodies

Explanation: – Prokaryotes store food particles and other necessary stuffs in the form of granules called the inclusion bodies In eukaryotes usually these substances are stored in vacuole But since prokaryotes lack vacuole they store it in the form of inclusion bodies.

19. Answer: (b) Control their buoyancy

Explanation: – Gas vacuoles are aggregates of hollow cylindrical structures called gas vesicles. They are located inside some bacteria .The inflation and deflation of the vesicles provides buoyancy, allowing the bacterium to float at a desired depth in the water. Bacteria that are known as cyanobacteria contain gas vacuoles.

20. Answer: (c) Phosphoglycerides

Explanation: – The lipid component of the cell membrane mainly consists of phosphoglycerides.

21. Answer: (c) Glyoxysomes

Explanation: -Glyoxysomes are specialized peroxisomes found in plants and mold, which help to convert stored lipids into carbohydrates so they can be used for plant growth.

22. Answer: (d) Mitochondria

Explanation: -Mitochondria are pivotal in the control of apoptosis, being involved not only in the intrinsic but also in the extrinsic pathway.

23. Answer: (c) Nucleolus

Explanation: -Molecules of rRNA are synthesized in a specialized region of the cell nucleus called the nucleolus, which appears as a dense area within the nucleus and contains the genes that encode rRNA.

24. Answer: (d) 9 + 2 pattern

Explanation: The flagellum and the cilia are composed of the microtubules. In the cilium, 9 peripheral doublets of microtubules are found which are known as the outer microtubules. The number of central microtubules in a cilium is two. This arrangement of the microtubules is called as the 9 + 2 pattern.

25. Answer: (d) chromatophores

Explanation: A cyanobacterium is having membranous extensions that are containing pigments that are known as chromatophores that are responsible for photosynthesis. The correct option is B i.e. chromatophores.

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