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🧬 Cell: The Unit of Life - NEET 2027 MCQ Bank

Dropper Special | 50 Questions | Full Chapter Coverage

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🔬 SECTION 1: Cell Theory (Q1-Q10)

• A) Robert Hooke and Leeuwenhoek
• B) Schleiden and Schwann
• C) Virchow and Fleming
• D) Watson and Crick

Matthias Schleiden (1838, plants) and Theodor Schwann (1839, animals) proposed cell theory.

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• A) Schleiden
• B) Schwann
• C) Rudolf Virchow
• D) Robert Brown

Virchow (1855) added this crucial modification to cell theory.

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• A) All living organisms are composed of cells
• B) Cell is the basic unit of life
• C) All cells have a nucleus
• D) All cells arise from pre-existing cells

Prokaryotes lack a true nucleus - this is NOT part of cell theory.

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• A) Leeuwenhoek
• B) Robert Hooke
• C) Schleiden
• D) Virchow

Robert Hooke (1665) observed dead cork cells and named them "cells" (like monastery rooms).

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• A) Robert Hooke
• B) Robert Brown
• C) Antonie van Leeuwenhoek
• D) Matthias Schleiden

Leeuwenhoek first observed living cells (bacteria, RBCs, sperm) using his microscope.

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• A) Bacteria
• B) Viruses
• C) Fungi
• D) Algae

Viruses are acellular (non-living outside host) - cell theory does not apply to them.

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• A) Robert Hooke
• B) Robert Brown
• C) Schleiden
• D) Flemming

Robert Brown (1831) discovered the nucleus in orchid root cells.

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• A) All organisms are made of cells
• B) Energy flow occurs within cells
• C) Genetic information passes from cell to cell
• D) All cells are identical in structure and function

Cells differ greatly in structure and function - this is NOT part of modern cell theory.

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• A) 1838 and 1839
• B) 1839 and 1838
• C) 1855 and 1838
• D) 1831 and 1855

Schleiden (botanist) - 1838 for plants; Schwann (zoologist) - 1839 for animals.

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• A) Amoeba
• B) Paramecium
• C) Acetabularia
• D) Chlamydomonas

Acetabularia is a single-celled giant alga that challenges simple interpretations of cell theory regarding nuclear control. (Also, viruses are the biggest exception.)

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🔬 SECTION 2: Prokaryotic vs Eukaryotic Cells (Q11-Q20)

• A) Ribosome
• B) Plasma membrane
• C) Mesosome
• D) Nucleic acid

Mesosomes are infoldings of the plasma membrane found only in prokaryotes.

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• A) 80S
• B) 70S
• C) 60S
• D) 40S

Prokaryotes have 70S ribosomes (50S + 30S subunits).

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• A) Nucleoid
• B) Pili
• C) Mesosome
• D) Plasmid

Mesosomes help in cellular respiration, cell division, and DNA replication - functions analogous to mitochondria.

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• A) Cell wall
• B) Ribosome
• C) Membrane-bound organelles
• D) DNA

Prokaryotes lack all membrane-bound organelles (nucleus, mitochondria, ER, Golgi, etc.).

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• A) Amoeba
• B) Euglena
• C) Mycoplasma
• D) Mucor

Mycoplasma is the smallest prokaryotic cell. Amoeba and Euglena are eukaryotes; Mucor is a fungus (eukaryote).

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• A) Chitin
• B) Cellulose
• C) Peptidoglycan (Murein)
• D) Lignin

Bacterial cell wall = peptidoglycan (murein). Fungal = chitin; Plant = cellulose.

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• A) Linear DNA outside nucleus in eukaryotes
• B) Circular extra-chromosomal DNA in bacteria
• C) RNA molecules in prokaryotes
• D) Protein structures in nucleus

Plasmids are small, circular, self-replicating extrachromosomal DNA molecules in bacteria.

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• A) ER
• B) Golgi body
• C) Mitochondria and Chloroplast
• D) Lysosome

Mitochondria and chloroplasts have 70S ribosomes (evidence of endosymbiotic origin).

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• A) Locomotion
• B) Attachment to surfaces and conjugation
• C) Protein synthesis
• D) Respiration

Pili (fimbriae) help bacteria attach to surfaces; sex pili help in conjugation (genetic transfer).

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• A) A membrane-bound nucleus
• B) A region with naked circular DNA
• C) A ribosome cluster
• D) A plasmid aggregate

Prokaryotes have a nucleoid - a poorly defined region with single circular DNA, no membrane.

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🔬 SECTION 3: Cell Organelles - Endomembrane System (Q21-30)

• A) Peroxisome
• B) Lysosome
• C) Vacuole
• D) Ribosome

Lysosomes contain hydrolytic enzymes that can digest cell contents - hence "suicide bags."

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• A) Singer and Nicolson (1972)
• B) Davson and Danielli (1935)
• C) Robertson (1959)
• D) Watson and Crick (1953)

Singer and Nicolson proposed the fluid mosaic model in 1972.

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• A) Rough ER
• B) Smooth ER
• C) Golgi body
• D) Ribosome

Smooth ER (SER) synthesizes lipids, steroids, and detoxifies drugs/poisons.

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• A) Camillo Golgi
• B) Robert Brown
• C) Schleiden
• D) De Duve

Camillo Golgi (1898) discovered it in nerve cells using silver staining.

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• A) Protein synthesis
• B) Glycosylation and packaging of proteins
• C) ATP synthesis
• D) Lipid breakdown

Golgi modifies, sorts, and packages proteins and lipids for secretion or delivery to organelles.

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• A) Mitochondria
• B) ER and Golgi
• C) Nucleus
• D) Plasma membrane

Lysosomes are formed by pinching off from the Golgi apparatus (with proteins from ER).

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• A) Plasmalemma
• B) Tonoplast
• C) Cell wall
• D) Nuclear envelope

The tonoplast (vacuolar membrane) bounds the central vacuole in plant cells.

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• A) ER
• B) Golgi body
• C) Lysosome
• D) Mitochondria

Mitochondria and chloroplasts are NOT part of the endomembrane system (they have their own independent origin).

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• A) Hydrolytic enzymes
• B) Oxidative enzymes (catalase, oxidase)
• C) Photosynthetic pigments
• D) Digestive enzymes

Peroxisomes contain oxidative enzymes like catalase that break down H₂O₂.

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• A) Smooth ER
• B) Rough ER
• C) Golgi
• D) Nuclear membrane

Ribophorins are integral proteins of rough ER that help attach ribosomes to its surface.

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🔬 SECTION 4: Mitochondria & Chloroplast (Q31-38)

• A) Thylakoids
• B) Cristae
• C) Grana
• D) Lamellae

Inner mitochondrial membrane folds into cristae, which increase surface area for ATP synthesis.

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• A) Outer mitochondrial membrane
• B) Inner surface of inner mitochondrial membrane (cristae)
• C) Matrix
• D) Intermembrane space

Oxysomes (F₀-F₁ particles) are on the inner surface of inner mitochondrial membrane (cristae).

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• A) Stroma
• B) Thylakoid membrane
• C) Outer chloroplast membrane
• D) Cytoplasm

Chlorophyll pigments are embedded in the thylakoid membranes.

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• A) Light reactions
• B) Dark reactions (Calvin cycle)
• C) Electron transport chain
• D) Photolysis of water

Dark reactions (Calvin cycle / CO₂ fixation) occur in the stroma of chloroplast.

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• A) Mitochondria have their own 70S ribosomes and circular DNA
• B) Mitochondria are part of endomembrane system
• C) Mitochondria have no DNA
• D) Mitochondria are formed from Golgi

70S ribosomes and circular DNA in mitochondria suggest they were once free-living prokaryotes.

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• A) Nucleus
• B) Chloroplast
• C) Ribosome
• D) Mitochondria

Mitochondria produce ATP via oxidative phosphorylation - hence "powerhouse of the cell."

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• A) Stroma lamellae
• B) Thylakoids
• C) Cristae
• D) Cisternae

Grana = stacks of thylakoids (disc-shaped sacs) in chloroplast.

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• A) 1
• B) 2
• C) 3
• D) 4

Mitochondria have two membranes: outer and inner (double membrane-bound organelle).

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🔬 SECTION 5: Nucleus, Cytoskeleton & Cilia (Q39-50)

• A) Only DNA
• B) Only proteins
• C) RNA, proteins, and ribosomes
• D) Only lipids

Nuclear pores facilitate exchange of RNA, ribosomal subunits, and proteins between nucleus and cytoplasm.

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• A) mRNA
• B) rRNA and ribosome assembly
• C) tRNA only
• D) DNA replication

Nucleolus synthesizes ribosomal RNA (rRNA) and is the site of ribosome assembly.

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• A) 9 singlet + 2 central doublets
• B) 9 doublets peripherally + 2 central singlets
• C) 9 triplets + 2 singlets
• D) 11 singlets in total

Cilia and flagella have the "9+2" arrangement: 9 peripheral doublets + 2 central singlets of microtubules.

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• A) Microfilaments (actin)
• B) Triplet microtubules (9+0 arrangement)
• C) Intermediate filaments
• D) 9+2 microtubule arrangement

Centrioles have 9 sets of triplet microtubules with no central tubule (9+0 arrangement).

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• A) Lymphocytes
• B) Mature RBCs
• C) Platelets only
• D) Both B and C

Mature RBCs and platelets (thrombocytes) both lack nuclei in humans.

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• A) Nucleus
• B) Chloroplast
• C) Central vacuole
• D) Mitochondria

The central vacuole can occupy up to 90% of a mature plant cell's volume.

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• A) 70S (50S + 30S)
• B) 80S (60S + 40S)
• C) 80S (50S + 30S)
• D) 70S (60S + 40S)

Eukaryotic cytoplasmic ribosomes = 80S (large 60S + small 40S subunits).

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• A) Mitochondria
• B) Ribosome
• C) Plastid
• D) Golgi body

Plastids (chloroplasts, chromoplasts, leucoplasts) are found only in plant cells (and algae).

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• A) Chitin
• B) Peptidoglycan
• C) Cellulose
• D) Glycogen

Plant cell wall = primarily cellulose microfibrils embedded in a matrix of hemicellulose and pectin.

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• A) Cellulose
• B) Calcium pectate
• C) Lignin
• D) Suberin

Middle lamella is the outermost layer between two adjacent plant cells, made of calcium pectate (pectin).

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• A) Purkinje
• B) Max Schultze
• C) Huxley
• D) Both A and B

Purkinje coined the term "protoplasm" (1839); Max Schultze gave the protoplasm theory (living substance of cells).

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• A) Cristae - Chloroplast
• B) Thylakoid - Mitochondria
• C) Grana - Chloroplast
• D) Mesosome - Eukaryote

Grana (stacked thylakoids) are found in chloroplasts. Cristae are in mitochondria. Mesosomes are in prokaryotes.

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📊 Quick Revision Summary Table

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🎯 Dropper Tips for NEET 2027

1. Cell theory exceptions - Viruses (acellular) are the most tested exception
2. Ribosome sizes - 70S (prokaryote) vs 80S (eukaryote) - asked every year
3. 9+2 vs 9+0 - Cilia/flagella = 9+2; Centriole/basal body = 9+0
4. Endomembrane system - ER, Golgi, Lysosome, Vacuole (NOT mitochondria/chloroplast)
5. Middle lamella = calcium pectate (cemented first during cell plate formation)
6. F₀-F₁ particles - on cristae of mitochondria (ATP synthase = "elementary particles")
7. Schleiden vs Schwann - Schleiden = plants (1838), Schwann = animals (1839)

🧬 NEET 2027 | Cell: The Unit of Life

Scientists Special - 50 MCQ Bank (Dropper Level)

Topics: Robert Hooke | Leeuwenhoek | Robert Brown | Schleiden | Schwann | Virchow

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🔬 SECTION 1: ROBERT HOOKE (Q1-Q10)

• A) Electron microscope
• B) Compound microscope (self-designed)
• C) Simple magnifying lens
• D) Phase contrast microscope

Hooke used his own self-designed compound microscope in 1665.

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• A) Living onion cells
• B) Dead cork cells (bark of oak tree)
• C) Bacteria
• D) Blood cells

Hooke cut thin slices of cork (dead cells of Quercus suber) and observed empty box-like structures.

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• A) 1655
• B) 1665
• C) 1675
• D) 1683

Robert Hooke observed and named cells in 1665 in his book "Micrographia".

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• A) Prison cells
• B) Honeycomb chambers
• C) Small rooms in a monastery
• D) Both B and C

The word "cell" comes from Latin cellula meaning small room - like monks' rooms in a monastery or honeycomb chambers.

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• A) Origin of Species
• B) Micrographia (1665)
• C) Historia Plantarum
• D) Systema Naturae

Hooke published Micrographia in 1665, describing his microscopic observations of cork.

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• A) Living plant cells with all organelles
• B) Empty dead cell walls of cork
• C) Living animal cells
• D) Bacterial cells

Cork cells are dead - Hooke only saw the empty cell walls, not living contents.

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• A) ~100
• B) ~1000
• C) ~1250
• D) He did not count them

Hooke estimated approximately 1250 cells per inch in cork tissue.

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• A) German botanist
• B) Dutch scientist
• C) English scientist
• D) French biologist

Robert Hooke (1635-1703) was an English natural philosopher, architect, and polymath.

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• A) He proved all organisms are made of cells
• B) He was the first to use the word "cell" for biological structures
• C) He discovered the nucleus
• D) He proposed cell theory

Hooke's greatest contribution was coining the term "cell" - but he did NOT propose cell theory.

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• A) Pine tree
• B) Oak tree (Quercus suber)
• C) Banyan tree
• D) Bamboo

Cork comes from the bark of Quercus suber (cork oak tree).

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🔬 SECTION 2: ANTONIE VAN LEEUWENHOEK (Q11-Q20)

• A) Dead cells
• B) Living cells (bacteria, protozoa, RBCs, sperm)
• C) Plant nuclei
• D) Cell division

Leeuwenhoek (1674 onwards) was the first to observe living cells using his simple microscope.

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• A) Cells
• B) Animalcules
• C) Protists
• D) Microbes

Leeuwenhoek called tiny living organisms "animalcules" (little animals).

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• A) German professor of botany
• B) Dutch draper (cloth merchant) and self-taught scientist
• C) English physician
• D) French chemist

Leeuwenhoek (1632-1723) was a Dutch cloth merchant who taught himself to grind lenses.

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• A) Compound microscope
• B) Electron microscope
• C) Simple (single-lens) microscope
• D) Phase contrast microscope

Leeuwenhoek used a single-lens (simple) microscope that he crafted himself with extraordinary precision.

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• A) 10x
• B) 50x
• C) 270x
• D) 1000x

His best microscopes achieved magnifications of up to ~270x, far superior to others of his time.

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• A) 1665
• B) 1674
• C) 1683
• D) 1700

Leeuwenhoek first clearly described bacteria from his own dental scrapings in 1683.

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• A) Pond water
• B) Dental scrapings
• C) Cork bark
• D) Blood

Cork was observed by Robert Hooke (dead cells). Leeuwenhoek observed pond water, blood, and dental scrapings.

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• A) American Academy of Sciences
• B) Royal Society of London
• C) French Academy of Sciences
• D) German Society of Biology

Leeuwenhoek reported his findings to the Royal Society of London (1673 onwards).

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• A) Father of cell theory
• B) Father of botany
• C) Father of microbiology
• D) Father of genetics

Leeuwenhoek is called the "Father of Microbiology" for discovering microorganisms.

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• A) Protozoa
• B) Red blood cells
• C) Sperm cells
• D) Nucleus in plant cells

The nucleus in plant cells was discovered by Robert Brown (1831). Leeuwenhoek observed bacteria, protozoa, RBCs, and sperm.

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🔬 SECTION 3: ROBERT BROWN (Q21-Q30)

• A) Robert Hooke
• B) Leeuwenhoek
• C) Robert Brown
• D) Schleiden

Robert Brown discovered the nucleus in 1831 while studying orchid root hair cells.

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• A) Onion cells
• B) Orchid root hair cells
• C) Cork cells
• D) Bacteria

Brown discovered the nucleus in orchid (Orchis) root hair cells in 1831.

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• A) Schleiden
• B) Schwann
• C) Robert Brown
• D) Virchow

Robert Brown named the central structure of the cell "nucleus" (from Latin = kernel).

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• A) German chemist
• B) Scottish botanist
• C) Dutch zoologist
• D) English physician

Robert Brown (1773-1858) was a Scottish botanist known for discovering the nucleus and Brownian motion.

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• A) Cell theory
• B) Brownian motion (random movement of particles)
• C) DNA structure
• D) Osmosis

Brown observed the random zigzag movement of pollen grains in water - now called Brownian motion (1827).

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• A) Cytoplasm
• B) Areola
• C) Nucleolus
• D) Vacuole

Brown initially called it "areola" before settling on "nucleus."

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• A) Discovery of DNA
• B) Development of cell theory by Schleiden
• C) Discovery of cell wall
• D) Proposal of endosymbiont theory

Schleiden (1838) was directly influenced by Brown's discovery and gave importance to the nucleus in cell theory.

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• A) 1827
• B) 1831
• C) 1838
• D) 1855

Robert Brown discovered and described the nucleus in 1831.

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• A) Pollen grain
• B) Root hair cells
• C) Leaf epidermis
• D) Flower petals

Brown found the nucleus while studying root hair cells of the orchid plant.

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• A) Nucleus → Cells → Living cells
• B) Living cells → Cells → Nucleus
• C) Cells → Living cells → Nucleus
• D) Nucleus → Living cells → Cells

Hooke saw cells (1665) → Leeuwenhoek saw living cells (1674-83) → Brown discovered nucleus (1831).

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🔬 SECTION 4: SCHLEIDEN & SCHWANN (Q31-40)

• A) Schwann
• B) Schleiden
• C) Virchow
• D) Brown

Matthias Schleiden (1838) proposed that all plants are composed of cells and cell products.

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• A) Schleiden
• B) Virchow
• C) Schwann
• D) Brown

Theodor Schwann (1839) extended cell theory to animals.

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• A) Zoologist
• B) Botanist
• C) Physician turned botanist
• D) Microbiologist

Matthias Schleiden (1804-1881) was a German lawyer who later became a botanist.

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• A) German botanist
• B) German zoologist/physiologist
• C) Dutch microbiologist
• D) Scottish botanist

Theodor Schwann (1810-1882) was a German zoologist and physiologist.

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• A) Mitochondria
• B) Cell wall
• C) Nucleus
• D) Chloroplast

Both Schleiden and Schwann emphasized the nucleus as a central and important structure in cells (influenced by Brown's discovery).

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• A) Cell division from existing cells
• B) Free cell formation (spontaneous generation within cells)
• C) Budding
• D) Endosymbiosis

Schleiden and Schwann incorrectly believed cells form by "free cell formation" (spontaneous generation) - this was later corrected by Virchow.

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• A) 1831
• B) 1838
• C) 1839
• D) 1855

Schleiden published "Contributions to Phytogenesis" in 1838 proposing plant cell theory.

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• A) 1838
• B) 1839
• C) 1845
• D) 1855

Schwann published his famous work in 1839, one year after Schleiden.

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• A) All organisms are composed of cells
• B) Cell is the structural unit of life
• C) New cells arise from pre-existing cells
• D) Cells and cell products form organisms

"Cells from pre-existing cells" was added by Virchow (1855). Schleiden & Schwann did NOT include this.

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• A) They argued about evolution
• B) Schleiden mentioned nuclei in plants which Schwann connected to animal cells - leading to unified cell theory
• C) They discovered DNA
• D) They proposed the endosymbiont theory

Their famous dinner discussion led Schwann to realize that nucleated animal cells were similar to plant cells, unifying cell theory.

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🔬 SECTION 5: RUDOLF VIRCHOW (Q41-50)

• A) Schleiden
• B) Schwann
• C) Rudolf Virchow
• D) Pasteur

Rudolf Virchow (1855) stated "Omnis cellula e cellula" meaning every cell arises from a pre-existing cell.

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• A) Every organism is a cell
• B) Every cell has a nucleus
• C) Every cell arises from a pre-existing cell
• D) Cells are the smallest unit of life

This Latin phrase means "all cells from cells" - the core of Virchow's modification.

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• A) Leeuwenhoek's animalcule theory
• B) Schleiden & Schwann's idea of spontaneous cell formation
• C) Brown's nucleus theory
• D) Hooke's dead cell observation

Virchow corrected Schleiden & Schwann who believed cells arise by spontaneous free formation.

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• A) 1838
• B) 1839
• C) 1845
• D) 1855

Virchow proposed "Omnis cellula e cellula" in 1855.

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• A) Botanist
• B) German pathologist and politician
• C) Dutch zoologist
• D) English botanist

Rudolf Virchow (1821-1902) was a German physician, pathologist, and politician - known as the "Father of Modern Pathology."

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• A) 1-Cells are basic unit + 2-Organisms made of cells + 3-Cells arise from cells
• B) 1-Nucleus is essential + 2-Cells are basic unit + 3-DNA controls cells
• C) 1-Organisms made of cells + 2-Cells arise spontaneously + 3-Cells have nucleus
• D) 1-Cells arise from cells + 2-Cells have DNA + 3-Cells are made of proteins

The 3 postulates: (1) All organisms made of cells, (2) Cell = basic unit of life, (3) Cells arise from pre-existing cells.

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• A) Raspail
• B) Pasteur
• C) François-Vincent Raspail (1825)
• D) Both A and C (same person)

François-Vincent Raspail used the phrase in 1825, but Virchow (1855) formalized and popularized it.

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• A) It helped explain how tumors and diseases spread cell by cell
• B) It helped discover antibiotics
• C) It proved viruses cause diseases
• D) It led to discovery of DNA

Virchow's "cellular pathology" concept showed that diseases originate at the cellular level - tumors grow by abnormal cell division.

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• A) Brown → Hooke → Leeuwenhoek → Schleiden → Schwann → Virchow
• B) Hooke → Leeuwenhoek → Brown → Schleiden → Schwann → Virchow
• C) Leeuwenhoek → Hooke → Schleiden → Brown → Schwann → Virchow
• D) Schleiden → Brown → Schwann → Hooke → Leeuwenhoek → Virchow

Hooke (1665) → Leeuwenhoek (1674-83) → Brown (1831) → Schleiden (1838) → Schwann (1839) → Virchow (1855)

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• A) 1-Q, 2-R, 3-S, 4-T, 5-P
• B) 1-P, 2-Q, 3-R, 4-S, 5-T
• C) 1-Q, 2-S, 3-R, 4-P, 5-T
• D) 1-R, 2-Q, 3-T, 4-S, 5-P

1-Q (Hooke coined "cell"), 2-R (Leeuwenhoek = Father of Microbiology), 3-S (Brown discovered nucleus), 4-T (Schleiden for plants), 5-P (Virchow = cells from cells).

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📊 MASTER REVISION TABLE

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🎯 NEET 2027 High-Yield Tricks

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