MCQs-Chap 2-The Invisible Living World:Beyond Our Naked Eye

Important Multiple Choice Questions for Class VIII (Subject Social Science)

Multiple Choice Questions:

Q1. Who first used the word cell in science?
a) Antonie van Leeuwenhoek
b) Robert Hooke
c) Louis Pasteur
d) Ananda Mohan Chakrabarty
Ans: b) Robert Hooke

Q2. The microscope invented by Robert Hooke magnified objects by approximately:
a) 20–30 times
b) 50–100 times
c) 200–300 times
d) 1000–2000 times
Ans: c) 200–300 times

Q3. Which scientist is known as the Father of Microbiology?
a) Robert Koch
b) Antonie van Leeuwenhoek
c) Louis Pasteur
d) Joseph Lister
Ans: b) Antonie van Leeuwenhoek

Q4. Which structure in an onion cell provides rigidity and support?
a) Cytoplasm
b) Nucleus
c) Cell wall
d) Vacuole
Ans: c) Cell wall

Q5. In animal cells, vacuoles are usually:
a) Large and central
b) Absent or very small
c) Filled with chlorophyll
d) Abundant in number and large
Ans: b) Absent or very small

Q6. Which part of the cell controls all activities?
a) Cell membrane
b) Nucleus
c) Cytoplasm
d) Vacuole
Ans: b) Nucleus

Q7. The green pigment present in plant cells is:
a) Carotene
b) Chlorophyll
c) Xanthophyll
d) Anthocyanin
Ans: b) Chlorophyll

Q8. The basic unit of life is:
a) Atom
b) Cell
c) Tissue
d) Organelle
Ans: b) Cell

Q9. Which among the following is a unicellular organism?
a) Amoeba
b) Mould
c) Mushroom
d) Neem tree
Ans: a) Amoeba

Q10. Microorganisms that can be both unicellular and multicellular are:
a) Bacteria
b) Fungi
c) Protozoa
d) Viruses
Ans: b) Fungi

Q11. Viruses multiply only:
a) In soil
b) In water
c) Inside living cells
d) In air
Ans: c) Inside living cells

Q12. The muscle cell is shaped like a:
a) Rectangle
b) Spindle
c) Star
d) Cube
Ans: b) Spindle

Q13. The nerve cell (neuron) is:
a) Short and round
b) Elongated with branches
c) Spherical without branches
d) Completely flat
Ans: b) Elongated with branches

Q14. Rhizobium bacteria live in:
a) Leaves of neem
b) Root nodules of legumes
c) Bark of trees
d) Animal stomachs
Ans: b) Root nodules of legumes

Q15. Yeast is used in making bread because it produces:
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Sulphur dioxide
Ans: b) Carbon dioxide

More MCQs:

Q16. Lactobacillus bacteria help in converting milk into:
a) Butter
b) Cheese
c) Curd
d) Paneer
Ans: c) Curd

Q17. Which microorganism produces more than half of Earth’s oxygen supply?
a) Bacteria
b) Protozoa
c) Microalgae
d) Viruses
Ans: c) Microalgae

Q18. Spirulina is called a:
a) Fungal spore
b) Protozoan parasite
c) Superfood
d) Virus
Ans: c) Superfood

Q19. The largest known cell is:
a) Human nerve cell
b) Onion peel cell
c) Ostrich egg yolk
d) Paramecium
Ans: c) Ostrich egg yolk

Q20. A group of similar cells performing the same function is called:
a) Organ
b) Tissue
c) System
d) Organism
Ans: b) Tissue

Q21. Which scientist developed oil-eating bacteria to clean oil spills?
a) Antonie van Leeuwenhoek
b) Robert Hooke
c) Ananda Mohan Chakrabarty
d) Louis Pasteur
Ans: c) Ananda Mohan Chakrabarty

Q22. Biogas mainly contains:
a) Oxygen
b) Nitrogen
c) Methane
d) Sulphur dioxide
Ans: c) Methane

Q23. Which structure distinguishes bacteria from plant cells?
a) Cell wall
b) Cytoplasm
c) Nucleoid (no well-defined nucleus)
d) Vacuole
Ans: c) Nucleoid

Q24. Which microorganism causes bread mould?
a) Yeast
b) Rhizobium
c) Mould fungi
d) Algae
Ans: c) Mould fungi

Q25. Pickles and murabbas are preserved due to:
a) High moisture content
b) High concentration of salt/sugar
c) Presence of oxygen
d) Bacterial action
Ans: b) High concentration of salt/sugar

Fill in the Blanks:

Q1. The __________ is known as the Father of Microbiology.
a) Robert Hooke
b) Antonie van Leeuwenhoek
c) Louis Pasteur
d) Robert Koch
Ans: b) Antonie van Leeuwenhoek

Q2. The cell wall in plants provides __________ and __________.
a) Strength, rigidity
b) Food, water
c) Energy, heat
d) Light, oxygen
Ans: a) Strength, rigidity

Q3. The largest known single cell is the __________ of an ostrich.
a) Nucleus
b) Egg yolk
c) Muscle fibre
d) Leaf cell
Ans: b) Egg yolk

Q4. Yeast is a type of __________.
a) Bacteria
b) Algae
c) Fungus
d) Protozoa
Ans: c) Fungus

Q5. Lactobacillus converts milk into __________ by producing lactic acid.
a) Butter
b) Curd
c) Cheese
d) Paneer
Ans: b) Curd

Q6. The three main parts of a cell are __________, __________, and __________.
a) Cytoplasm, Nucleus, Cell membrane
b) Nucleus, Ribosome, DNA
c) Vacuole, Chloroplast, Cell wall
d) Cytoplasm, Vacuole, Lysosome
Ans: a) Cytoplasm, Nucleus, Cell membrane

Q7. Microorganisms found in root nodules of legumes are called __________.
a) Amoeba
b) Rhizobium
c) Paramecium
d) Spirulina
Ans: b) Rhizobium

Q8. The __________ in the cheek cell is covered by a thin membrane.
a) Vacuole
b) Nucleus
c) Chloroplast
d) Cell wall
Ans: b) Nucleus

Q9. Spirulina is rich in __________ and considered a superfood.
a) Protein
b) Starch
c) Fat
d) Oil
Ans: a) Protein

Q10. Viruses reproduce only inside a __________ cell.
a) Dead
b) Non-living
c) Host
d) Plant
Ans: c) Host

True / False:

Q1. All microorganisms are harmful to humans.
Ans: False

Q2. Plant cells usually have a large vacuole, while animal cells have small or no vacuoles.
Ans: True

Q3. Microalgae contribute significantly to Earth’s oxygen supply.
Ans: True

Q4. The term “cell” was first coined by Antonie van Leeuwenhoek.
Ans: False (Robert Hooke coined it)

Q5. Rhizobium bacteria increase soil fertility by fixing nitrogen.
Ans: True

Match the Following:

Q1. Match the microorganism with its use/disease:

a) Yeast → (i) Curd formation
b) Lactobacillus → (ii) Bread and cake making
c) Rhizobium → (iii) Food spoilage
d) Spirulina → (iv) Nitrogen fixation
e) Mould fungi → (v) Superfood

Ans: a–ii, b–i, c–v, d–iii, e–iv

Q2. Match the structure with its function:

a) Nucleus → (i) Storage
b) Cytoplasm → (ii) Control of activities
c) Cell membrane → (iii) Life processes occur
d) Cell wall → (iv) Selective entry/exit
e) Vacuole → (v) Rigidity

Ans: a–v, b–i, c–ii, d–iii, e–iv

Q3. Match the scientist with contribution:

a) Robert Hooke → (i) Tuberculosis bacterium discovery
b) Antonie van Leeuwenhoek → (ii) Coined the term “cell”
c) Ananda Mohan Chakrabarty → (iii) Father of Microbiology
d) Louis Pasteur → (iv) Oil-eating bacteria
e) Robert Koch → (v) Germ theory of disease

Ans: a–ii, b–iii, c–iv, d–v, e–i

Q4. Match the cell type with characteristic:

a) Muscle cell → (i) Spindle-shaped
b) Nerve cell → (ii) Elongated with branches
c) Cheek cell → (iii) Thin and flat
d) Onion peel cell → (iv) Rectangular
e) Algal cell → (v) Green pigment present

Ans: a–i, b–ii, c–iii, d–iv, e–v

Q5. Match the preservation method with reason:

a) Pickles → (i) Removes moisture
b) Jams → (ii) Low temperature slows growth
c) Refrigeration → (iii) High sugar concentration
d) Drying → (iv) Airtight sealing
e) Canning → (v) High salt concentration

Ans: a–v, b–iii, c–ii, d–i, e–iv

Assertion–Reason Questions:

a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, but R is not the correct explanation of A.
c) A is true, R is false.
d) A is false, R is true.

Q1. Assertion (A): Viruses are not considered fully living organisms.
Reason (R): They reproduce only inside host cells.
Ans: a) Both A and R are true, and R is the correct explanation of A.

Q2. Assertion (A): Plant cells look firm and rigid.
Reason (R): They have a cell wall that provides structural strength.
Ans: a) Both A and R are true, and R is the correct explanation of A.

Q3. Assertion (A): Bread dough rises when yeast is added.
Reason (R): Yeast releases carbon dioxide during respiration.
Ans: a) Both A and R are true, and R is the correct explanation of A.

Q4. Assertion (A): All microorganisms can be seen without a microscope.
Reason (R): They are very large in size.
Ans: d) A is false, R is true.

Q5. Assertion (A): Rhizobium bacteria help plants grow without fertilizers.
Reason (R): They fix atmospheric nitrogen in root nodules.
Ans: a) Both A and R are true, and R is the correct explanation of A.

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Multiple Choice Questions:

Chapter-1 Exploring the Investigative World of Science – CLICK HERE

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