Chapter 8: Cell Unit of Life

NCERT Solutions for CBSE Class 10 Biology — 35 solved questions with detailed explanations.

Questions

Topics

Solved Questions

Q1. The fluid mosaic model of plasma membrane was proposed by:

Robertson
Danielli and Davson
Singer and Nicolson
Watson and Crick

Difficulty: Easy · Topic: Cell Membrane

Solution

Singer and Nicolson (1972) proposed the fluid mosaic model with proteins floating in a lipid bilayer.

Q2. The powerhouse of the cell is:

Nucleus
Ribosome
Mitochondria
Golgi apparatus

Difficulty: Easy · Topic: Cell Organelles

Solution

Mitochondria are the 'powerhouse' due to ATP production via oxidative phosphorylation.

Q3. Smooth ER is involved in:

protein synthesis
cell division
lipid synthesis
DNA replication

Difficulty: Easy · Topic: Cell Unit of Life

Solution

lipid synthesis.

Q4. Centrioles are involved in:

photosynthesis
lipid metabolism
protein synthesis
cell division (spindle formation)

Difficulty: Easy · Topic: Cell Unit of Life

Solution

cell division (spindle formation).

Q5. Plastids are found in:

plant cells
animal cells
fungal cells
bacterial cells

Difficulty: Easy · Topic: Cell Unit of Life

Solution

plant cells.

Q6. Prokaryotic cells lack:

cell membrane
DNA
membrane-bound nucleus
ribosomes

Difficulty: Easy · Topic: Cell Unit of Life

Solution

membrane-bound nucleus.

Q7. Eukaryotic cells have:

no nucleus
no ribosomes
no DNA
membrane-bound organelles

Difficulty: Easy · Topic: Cell Unit of Life

Solution

membrane-bound organelles.

Q8. Nucleolus is the site of:

rRNA synthesis
DNA replication
protein synthesis
lipid synthesis

Difficulty: Easy · Topic: Cell Unit of Life

Solution

rRNA synthesis.

Q9. Peroxisomes contain:

hydrolytic enzymes
DNA
RNA
oxidative enzymes

Difficulty: Easy · Topic: Cell Unit of Life

Solution

oxidative enzymes.

Q10. Main function of Mitochondria:

Lipid synthesis
ATP production (oxidative phosphorylation)
Protein synthesis
DNA storage

Difficulty: Easy · Topic: Cell Organelles

Solution

Mitochondria: ATP production (oxidative phosphorylation).

Q11. Main function of Ribosomes:

ATP production
Protein synthesis
Lipid synthesis
DNA replication

Difficulty: Easy · Topic: Cell Organelles

Solution

Ribosomes: Protein synthesis.

Q12. Main function of Golgi apparatus:

ATP production
Packaging and secretion
DNA storage
Protein synthesis

Difficulty: Easy · Topic: Cell Organelles

Solution

Golgi apparatus: Packaging and secretion.

Q13. Main function of Endoplasmic reticulum (rough):

ATP production
DNA replication
Protein synthesis and transport
Lipid synthesis

Difficulty: Easy · Topic: Cell Organelles

Solution

Endoplasmic reticulum (rough): Protein synthesis and transport.

Q14. Main function of Endoplasmic reticulum (smooth):

Lipid synthesis and detoxification
DNA replication
ATP production
Protein synthesis

Difficulty: Easy · Topic: Cell Organelles

Solution

Endoplasmic reticulum (smooth): Lipid synthesis and detoxification.

Q15. Main function of Lysosomes:

Lipid synthesis
Protein synthesis
ATP production
Intracellular digestion

Difficulty: Easy · Topic: Cell Organelles

Solution

Lysosomes: Intracellular digestion.

Q16. Main function of Peroxisomes:

Protein synthesis
Oxidation of fatty acids, H₂O₂ metabolism
DNA replication
ATP production

Difficulty: Easy · Topic: Cell Organelles

Solution

Peroxisomes: Oxidation of fatty acids, H₂O₂ metabolism.

Q17. Main function of Chloroplasts:

Lipid synthesis
Protein synthesis
Respiration
Photosynthesis

Difficulty: Easy · Topic: Cell Organelles

Solution

Chloroplasts: Photosynthesis.

Q18. Main function of Nucleus:

DNA storage and gene expression control
Protein folding
ATP production
Lipid metabolism

Difficulty: Easy · Topic: Cell Organelles

Solution

Nucleus: DNA storage and gene expression control.

Q19. Main function of Centrioles:

ATP production
DNA replication
Spindle formation in cell division
Protein synthesis

Difficulty: Easy · Topic: Cell Organelles

Solution

Centrioles: Spindle formation in cell division.

Q20. Main function of Vacuoles (plant):

ATP production
Protein synthesis
Storage, turgor pressure
DNA replication

Difficulty: Easy · Topic: Cell Organelles

Solution

Vacuoles (plant): Storage, turgor pressure.

Q21. Robert Hooke discovered:

cells (in cork)
nucleus
mitochondria
ribosomes

Difficulty: Easy · Topic: Cell Unit of Life

Solution

cells (in cork).

Q22. Cell wall of plant cells contains:

chitin
cellulose
peptidoglycan
keratin

Difficulty: Easy · Topic: Cell Unit of Life

Solution

cellulose.

Q23. Prokaryotic cells have:

70S ribosomes
both types
80S ribosomes
no ribosomes

Difficulty: Easy · Topic: Cell Unit of Life

Solution

70S ribosomes.

Q24. Nuclear envelope has:

double membrane with nuclear pores
no membrane
triple membrane
single membrane

Difficulty: Easy · Topic: Cell Unit of Life

Solution

double membrane with nuclear pores.

Q25. Chromatin is made of:

protein only
DNA + histone proteins
RNA only
lipids

Difficulty: Easy · Topic: Cell Unit of Life

Solution

DNA + histone proteins.

Q26. Nucleoplasm is the:

matrix within nucleus
ER lumen
cell membrane
cytoplasm

Difficulty: Easy · Topic: Cell Unit of Life

Solution

matrix within nucleus.

Q27. Cell theory was modified by:

Schleiden
Hooke
Schwann
Virchow (omnis cellula e cellula)

Difficulty: Easy · Topic: Cell Unit of Life

Solution

Virchow (omnis cellula e cellula).

Q28. Cilia and flagella contain:

random
9+0
9+2 arrangement of microtubules
no microtubules

Difficulty: Easy · Topic: Cell Unit of Life

Solution

9+2 arrangement of microtubules.

Q29. Centrioles have:

9+3
9+0 arrangement of microtubule triplets
random
9+2

Difficulty: Easy · Topic: Cell Unit of Life

Solution

9+0 arrangement of microtubule triplets.

Q30. 70S ribosomes are found in:

Eukaryotic cytoplasm
Prokaryotic cells
Eukaryotic nucleus
Lysosomes

Difficulty: Easy-Medium · Topic: Ribosomes

Solution

Prokaryotes have 70S ribosomes (50S + 30S). Eukaryotic cytoplasm has 80S ribosomes (60S + 40S).

Q31. The cell theory was proposed by:

Schleiden and Schwann
Darwin
Mendel
Watson and Crick

Difficulty: Easy-Medium · Topic: Cell Unit of Life

Solution

Schleiden and Schwann.

Q32. Lysosomes are called:

powerhouse
cell brain
protein factory
suicidal bags

Difficulty: Easy-Medium · Topic: Cell Unit of Life

Solution

suicidal bags.

Q33. Rough ER has:

ribosomes on surface
DNA
smooth surface
no membrane

Difficulty: Easy-Medium · Topic: Cell Unit of Life

Solution

ribosomes on surface.

Q34. Golgi apparatus functions in:

protein synthesis
energy production
packaging and secretion
DNA storage

Difficulty: Easy-Medium · Topic: Cell Unit of Life

Solution

packaging and secretion.

Q35. Chloroplasts contain:

myoglobin
hemoglobin
chlorophyll
keratin

Difficulty: Easy-Medium · Topic: Cell Unit of Life

Solution

chlorophyll.

Other Chapters in Biology

Ch 1: The Living World Ch 2: Biological Classification Ch 3: Plant Kingdom Ch 4: Animal Kingdom Ch 5: Morphology of Plants Ch 6: Anatomy of Plants Ch 7: Structural Organisation in Animals Ch 9: Biomolecules Ch 10: Cell Cycle Ch 11: Transport in Plants Ch 12: Mineral Nutrition Ch 13: Photosynthesis Ch 14: Respiration in Plants Ch 15: Plant Growth Ch 16: Digestion & Absorption Ch 17: Breathing & Gas Exchange Ch 18: Body Fluids & Circulation Ch 19: Excretory Products Ch 20: Locomotion & Movement Ch 21: Neural Control Ch 22: Chemical Coordination

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