50 Most Important NEET PYQs of Chapter 8: Cell - The Unit of Life – Part 1 (Q1–25) | By neetpyqall

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🧬 50 Most Important NEET PYQs of Chapter 8: Cell - The Unit of Life – Part 1 (Q1–25) | By neetpyqall

Welcome to Part 1 of the 50 most important NEET previous year questions from Chapter 8: Cell - The Unit of Life. This chapter is foundational for understanding cellular structure, organelles, and their functions. Let’s start with Questions 1 to 25 along with detailed solutions!

1. Who proposed the cell theory?

A) Schleiden and Schwann
B) Hooke and Virchow
C) Schwann and Virchow
D) Schleiden and Hooke
✅ Answer: A) Schleiden and Schwann
Explanation: Matthias Schleiden (botanist) and Theodor Schwann (zoologist) proposed the Cell Theory in 1838-39, stating that all living things are composed of cells.

2. Which of the following is not found in a prokaryotic cell?

A) DNA
B) Plasma membrane
C) Nucleus
D) Ribosomes
✅ Answer: C) Nucleus
Explanation: Prokaryotic cells lack a membrane-bound nucleus. Their DNA is present in the nucleoid region.

3. Cell wall in fungi is made up of:

A) Cellulose
B) Chitin
C) Peptidoglycan
D) Hemicellulose
✅ Answer: B) Chitin
Explanation: Unlike plants (cellulose), fungi have a cell wall made of chitin.

4. Which of these is a single membrane-bound organelle?

A) Nucleus
B) Mitochondria
C) Lysosome
D) Chloroplast
✅ Answer: C) Lysosome
Explanation: Lysosomes are single membrane-bound vesicles containing hydrolytic enzymes.

5. Functional unit of a chromosome is:

A) Centromere
B) Chromatid
C) Gene
D) Histone
✅ Answer: C) Gene
Explanation: Gene is the hereditary unit and functional segment of a chromosome that codes for a protein.

6. In a prokaryotic cell, ribosomes are of the type:

A) 80S
B) 70S
C) 60S
D) 90S
✅ Answer: B) 70S
Explanation: Prokaryotic ribosomes are 70S (smaller), while eukaryotic ribosomes are 80S.

7. The term "nucleoid" refers to:

A) True nucleus
B) Nuclear pore
C) Primitive nucleus in prokaryotes
D) Nucleolus
✅ Answer: C) Primitive nucleus in prokaryotes
Explanation: Nucleoid is the irregular region in prokaryotic cells where DNA is located.

8. Which cell organelle is known as the "suicidal bag"?

A) Peroxisome
B) Ribosome
C) Lysosome
D) Mitochondria
✅ Answer: C) Lysosome
Explanation: Lysosomes contain digestive enzymes and can digest the cell’s own components during damage.

9. The organelle responsible for aerobic respiration is:

A) Golgi body
B) Lysosome
C) Mitochondria
D) Chloroplast
✅ Answer: C) Mitochondria
Explanation: Mitochondria are the powerhouse of the cell, producing ATP via aerobic respiration.

10. Which cell organelle is responsible for packaging and transport?

A) ER
B) Golgi apparatus
C) Ribosomes
D) Centrosome
✅ Answer: B) Golgi apparatus
Explanation: The Golgi body modifies, packages, and transports materials in vesicles.

11. Ribosomes are manufactured in:

A) Golgi bodies
B) Nucleolus
C) Cytoplasm
D) Lysosomes
✅ Answer: B) Nucleolus
Explanation: The nucleolus is the site for rRNA synthesis and ribosome assembly.

12. Which of the following lacks a membrane?

A) Golgi body
B) Ribosome
C) Mitochondria
D) Lysosome
✅ Answer: B) Ribosome
Explanation: Ribosomes are non-membranous and are found freely in cytoplasm or attached to ER.

13. The double membrane-bound organelles are:

A) Lysosome and Golgi
B) Mitochondria and Nucleus
C) Ribosome and ER
D) Peroxisome and Centrosome
✅ Answer: B) Mitochondria and Nucleus
Explanation: Both mitochondria and nucleus have double membranes.

14. Which organelle is involved in detoxification of poisons?

A) SER
B) RER
C) Lysosome
D) Ribosome
✅ Answer: A) SER
Explanation: Smooth Endoplasmic Reticulum helps in detoxifying harmful substances, especially in liver cells.

15. The fluid part of cytoplasm is known as:

A) Nucleoplasm
B) Cytosol
C) Matrix
D) Stroma
✅ Answer: B) Cytosol
Explanation: Cytosol is the semi-fluid portion of the cytoplasm where organelles are suspended.

16. Prokaryotic cells reproduce by:

A) Mitosis
B) Meiosis
C) Binary fission
D) Budding
✅ Answer: C) Binary fission
Explanation: Prokaryotes divide asexually through binary fission, a simple division process.

17. Who discovered the cell?

A) Robert Koch
B) Schleiden
C) Robert Hooke
D) Virchow
✅ Answer: C) Robert Hooke
Explanation: In 1665, Hooke observed cork cells under a microscope and coined the term "cell."

18. Which of the following is not a component of plasma membrane?

A) Proteins
B) Phospholipids
C) Nucleic acids
D) Carbohydrates
✅ Answer: C) Nucleic acids
Explanation: Nucleic acids (DNA/RNA) are not part of the plasma membrane; they are found in the nucleus or cytoplasm.

19. Fluid Mosaic Model was proposed by:

A) Singer and Nicolson
B) Robert Hooke
C) Schleiden and Schwann
D) Watson and Crick
✅ Answer: A) Singer and Nicolson
Explanation: In 1972, they proposed the model where proteins float in a phospholipid bilayer.

20. The genetic material in prokaryotes is:

A) Linear and covered by nuclear membrane
B) Linear and free in cytoplasm
C) Circular and free in cytoplasm
D) Circular and inside nucleus
✅ Answer: C) Circular and free in cytoplasm
Explanation: Prokaryotic DNA is circular and located in the nucleoid without a nuclear membrane.

21. A cell will swell up if:

A) It is placed in a hypertonic solution
B) It is placed in an isotonic solution
C) It is placed in a hypotonic solution
D) None of the above
✅ Answer: C) It is placed in a hypotonic solution
Explanation: Water enters the cell in hypotonic conditions, causing it to swell.

22. The unit membrane concept was given by:

A) Danielli and Davson
B) Singer and Nicolson
C) Robertson
D) Watson and Crick
✅ Answer: C) Robertson
Explanation: Robertson proposed the unit membrane concept, which refers to the trilaminar appearance of membranes.

23. Plasmodesmata are found in:

A) Animal cells only
B) Plant cells only
C) Both A and B
D) Neither
✅ Answer: B) Plant cells only
Explanation: Plasmodesmata are cytoplasmic bridges that connect adjacent plant cells.

24. Which of the following helps in spindle formation during cell division?

A) Lysosome
B) Centrioles
C) Golgi apparatus
D) Endoplasmic reticulum
✅ Answer: B) Centrioles
Explanation: Centrioles help in the formation of spindle fibers during mitosis in animal cells.

25. The size of a ribosome in eukaryotic cells is:

A) 80S
B) 70S
C) 60S
D) 50S
✅ Answer: A) 80S
Explanation: Eukaryotic ribosomes are 80S type, made of 60S (large) and 40S (small) subunits.

Let me know when you're ready for Part 2 (Q26–50) of this chapter, and I’ll deliver it right away!
And as always, follow for more:
🔗 neetpyqall.blogspot.com
🔗 biologyatease1.blogspot.com

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