NCERT Class 9 Science MCQ Chapter 2 Cell: The Building Block of Life English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 2 Cell: The Building Block of Life Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 2 Cell: The Building Block of Life Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 2 Cell: The Building Block of Life
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Cell: The Building Block of Life
Chapter – 2
| MCQ |
Tick the Correct Options:
1. Where do some researchers believe life may have originated on early Earth?
(a) Deep inside volcanoes.
(b) In small water pools with changing conditions like hot springs.
(c) In dry desert sands.
(d) In frozen glaciers.
Ans: (b) In small water pools with changing conditions like hot springs.
2. What is the limit of resolution of the human eye?
(a) 1 mm.
(b) 10 mm.
(c) 0.1 mm.
(d) 0.01 mm.
Ans: (c) 0.1 mm.
3. Who was the first person to observe a cell in 1665?
(a) Camillo Golgi.
(b) Matthias Schleiden.
(c) Theodor Schwann.
(d) Robert Hooke.
Ans: (d) Robert Hooke.
4. Which of the following is an example of a unicellular organism?
(a) Human.
(b) Yeast.
(c) Neem tree.
(d) Fish.
Ans: (b) Yeast.
5. What do electron microscopes use to produce highly magnified images?
(a) Visible light.
(b) Sound waves.
(c) A beam of electrons.
(d) Magnetic forces.
Ans: (c) A beam of electrons.
6. What term describes the cell membrane’s ability to allow some substances to pass while blocking others?
(a) Fully permeable.
(b) Selectively permeable.
(c) Impermeable.
(d) Rigidly structured.
Ans: (b) Selectively permeable.
7. What is the diffusion of water across a selectively permeable membrane called?
(a) Osmosis.
(b) Respiration.
(c) Transpiration.
(d) Photosynthesis.
Ans: (a) Osmosis.
8. What happens to an animal cell when placed in a concentrated sugar solution?
(a) It swells up.
(b) It bursts immediately.
(c) It loses water and shrinks.
(d) It remains completely unchanged.
Ans: (c) It loses water and shrinks.
9. According to the fluid-mosaic model, what is the cell membrane primarily made of?
(a) Carbohydrates and water.
(b) Cellulose and pectin.
(c) DNA and RNA.
(d) Lipids (fats) and proteins.
Ans: (d) Lipids (fats) and proteins.
10. What is the plant cell wall primarily composed of?
(a) Proteins.
(b) Lipids.
(c) Cellulose.
(d) Starch.
Ans: (c) Cellulose.
11. Which structure is present in a plant cell but absent in an animal cell?
(a) Cell membrane.
(b) Mitochondria.
(c) Nucleus.
(d) Cell wall.
Ans: (d) Cell wall.
12. Where is the genetic material located in a prokaryotic cell?
(a) In a well-defined nucleus.
(b) In a region called the nucleoid.
(c) Inside the mitochondria.
(d) In the Golgi apparatus.
Ans: (b) In a region called the nucleoid.
13. Which of the following human cells do not have a nucleus?
(a) Cheek cells.
(b) Nerve cells.
(c) Mature Red Blood Cells (RBCs).
(d) Muscle cells.
Ans: (c) Mature Red Blood Cells (RBCs).
14. What are the functional segments of DNA molecules called?
(a) Chromosomes.
(b) Genes.
(c) Ribosomes.
(d) Proteins.
Ans: (b) Genes.
15. Which tiny structures in the cell act as the sites of protein synthesis?
(a) Lysosomes.
(b) Vacuoles.
(c) Plastids.
(d) Ribosomes.
Ans: (d) Ribosomes.
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