Chapter Exam

Chapter 2: Cell: The Building Block of Life — Online MCQ Test

Q: Who discovered the cell in 1665 while observing cork slices under a microscope?

Answer: B. Robert Hooke — Robert Hooke observed cork and coined the term "cell". Anton van Leeuwenhoek later observed living cells.

Q: The jelly-like substance present inside the cell membrane and surrounding the organelles is called:

Answer: B. Cytoplasm — Cytoplasm is the fluid material inside the cell membrane in which organelles are suspended.

Q: A cell placed in a hypotonic solution swells up because:

Answer: B. Water moves into the cell — In a hypotonic solution, water enters the cell by osmosis, causing it to swell.

Q: Which of the following is NOT a cell organelle?

Answer: C. Plasma membrane — The plasma membrane is a cell boundary, not a cell organelle.

SCIENCE · Grade 9 · CBSE(NCERT)

Practice Chapter 2: Cell: The Building Block of Life with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 9 SCIENCE. This chapter covers: Cell Cell Membrane Nucleus Cytoplasm Organelles Mitochondria Chloroplast Endoplasmic Reticulum Golgi Apparatus Ribosome Life Processes Understanding cell structure organelles their.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 2: Cell: The Building Block of Life — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 9 SCIENCE — Chapter 2: Cell: The Building Block of Life, with answers and explanations. These are sample questions; the exam has its own separate question set.

Who discovered the cell in 1665 while observing cork slices under a microscope?

A. Anton van Leeuwenhoek
B. Robert Hooke ✓
C. Robert Brown
D. Schleiden

Answer: B. Robert Hooke
Robert Hooke observed cork and coined the term "cell". Anton van Leeuwenhoek later observed living cells.

The jelly-like substance present inside the cell membrane and surrounding the organelles is called:

A. Nucleus
B. Cytoplasm ✓
C. Cell wall
D. Vacuole

Answer: B. Cytoplasm
Cytoplasm is the fluid material inside the cell membrane in which organelles are suspended.

A cell placed in a hypotonic solution swells up because:

A. Water moves out of the cell
B. Water moves into the cell ✓
C. Salt moves into the cell
D. The cell wall dissolves

Answer: B. Water moves into the cell
In a hypotonic solution, water enters the cell by osmosis, causing it to swell.

Which of the following is NOT a cell organelle?

A. Mitochondrion
B. Golgi apparatus
C. Plasma membrane ✓
D. Ribosome

Answer: C. Plasma membrane
The plasma membrane is a cell boundary, not a cell organelle.

Which statement is correct about mitochondria and chloroplasts?

A. Both are present in all plant and animal cells
B. Mitochondria release energy, while chloroplasts trap solar energy ✓
C. Chloroplasts are the site of respiration, while mitochondria are the site of photosynthesis
D. Both are only present in animal cells

Answer: B. Mitochondria release energy, while chloroplasts trap solar energy
Mitochondria are the sites of cellular respiration and release energy, whereas chloroplasts capture light energy for photosynthesis.

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