50 MCQs: Cell – The Fundamental Unit of Life
(Important questions for class 9th)
1. Who discovered cells for the first time in 1665 while examining a
thin slice of cork?
A) Robert Brown
B) Robert Hooke
C) Antonie van Leeuwenhoek
D) Purkinje
Answer: B) Robert Hooke
2. Which scientist discovered free-living cells in pond water for the
first time in 1674?
A) Robert Hooke
B) Theodor Schwann
C) Antonie van Leeuwenhoek
D) Rudolf Virchow
Answer: C) Antonie van Leeuwenhoek
3. Who expanded the cell theory by stating “Omnis cellula-e cellula”
(All cells arise from pre-existing cells)?
A) M.J. Schleiden
B) Theodor Schwann
C) Robert Brown
D) Rudolf Virchow
Answer: D) Rudolf Virchow
4. Which of the following organisms is unicellular?
A) Mushroom
B) Chlamydomonas
C) Mango tree
D) Human being
, Answer: B) Chlamydomonas
5. The plasma membrane is primarily composed of which two
biomolecules?
A) Cellulose and Pectin
B) Lipids and Proteins
C) Chitin and Glycogen
D) Nucleic acids and Carbohydrates
Answer: B) Lipids and Proteins
6. Why is the plasma membrane called a selectively permeable
membrane?
A) It allows all substances to pass through freely.
B) It completely blocks everything from entering or leaving the cell.
C) It permits the entry and exit of only some materials while preventing
others.
D) It only allows water molecules to pass through and nothing else.
Answer: C) It permits the entry and exit of only some materials
while preventing others.
7. Carbon dioxide or oxygen move across the cell membrane by the
process of:
A) Osmosis
B) Diffusion
C) Endocytosis
D) Plasmolysis
Answer: B) Diffusion
8. The movement of water molecules through a selectively
permeable membrane along a concentration gradient is called:
A) Diffusion
B) Plasmolysis
C) Osmosis
(Important questions for class 9th)
1. Who discovered cells for the first time in 1665 while examining a
thin slice of cork?
A) Robert Brown
B) Robert Hooke
C) Antonie van Leeuwenhoek
D) Purkinje
Answer: B) Robert Hooke
2. Which scientist discovered free-living cells in pond water for the
first time in 1674?
A) Robert Hooke
B) Theodor Schwann
C) Antonie van Leeuwenhoek
D) Rudolf Virchow
Answer: C) Antonie van Leeuwenhoek
3. Who expanded the cell theory by stating “Omnis cellula-e cellula”
(All cells arise from pre-existing cells)?
A) M.J. Schleiden
B) Theodor Schwann
C) Robert Brown
D) Rudolf Virchow
Answer: D) Rudolf Virchow
4. Which of the following organisms is unicellular?
A) Mushroom
B) Chlamydomonas
C) Mango tree
D) Human being
, Answer: B) Chlamydomonas
5. The plasma membrane is primarily composed of which two
biomolecules?
A) Cellulose and Pectin
B) Lipids and Proteins
C) Chitin and Glycogen
D) Nucleic acids and Carbohydrates
Answer: B) Lipids and Proteins
6. Why is the plasma membrane called a selectively permeable
membrane?
A) It allows all substances to pass through freely.
B) It completely blocks everything from entering or leaving the cell.
C) It permits the entry and exit of only some materials while preventing
others.
D) It only allows water molecules to pass through and nothing else.
Answer: C) It permits the entry and exit of only some materials
while preventing others.
7. Carbon dioxide or oxygen move across the cell membrane by the
process of:
A) Osmosis
B) Diffusion
C) Endocytosis
D) Plasmolysis
Answer: B) Diffusion
8. The movement of water molecules through a selectively
permeable membrane along a concentration gradient is called:
A) Diffusion
B) Plasmolysis
C) Osmosis
