Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Cell - The Unit of Life — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
The basic structural and functional unit of life is the:
- A.Tissue
- B.Cell
- C.Organ
- D.Molecule
2.
The cell was first observed (in cork) by:
- A.Schwann
- B.Robert Hooke
- C.Virchow
- D.Schleiden
3.
'All cells arise from pre-existing cells' was stated by:
- A.Hooke
- B.Leeuwenhoek
- C.Rudolf Virchow
- D.Schleiden
4.
Prokaryotic cells lack:
- A.A cell membrane
- B.Cytoplasm
- C.A true (membrane-bound) nucleus
- D.DNA
5.
Which structure is present in a plant cell but NOT an animal cell?
- A.Cell wall
- B.Nucleus
- C.Mitochondria
- D.Ribosomes
6.
The plasma membrane is best described by the:
- A.Cell theory
- B.Fluid mosaic model
- C.Lock and key model
- D.Germ theory
7.
The plant cell wall is mainly made of:
- A.Chitin
- B.Cellulose
- C.Protein
- D.Lipid
8.
Rough endoplasmic reticulum is the site of synthesis of:
- A.Lipids
- B.Proteins
- C.Carbohydrates only
- D.ATP
9.
The organelle that modifies, packs and dispatches cell products is the:
- A.Golgi apparatus
- B.Lysosome
- C.Vacuole
- D.Centrosome
10.
Lysosomes are called the 'suicide bags' because they contain:
- A.Pigments
- B.Digestive enzymes
- C.Chlorophyll
- D.DNA
11.
The 'powerhouse of the cell', producing ATP, is the:
- A.Ribosome
- B.Mitochondrion
- C.Golgi body
- D.Nucleus
12.
Photosynthesis occurs in the:
- A.Chloroplast
- B.Chromoplast
- C.Leucoplast
- D.Mitochondrion
13.
Ribosomes are the site of:
- A.Respiration
- B.Protein synthesis
- C.Photosynthesis
- D.Digestion
14.
The control centre of the cell is the:
- A.Vacuole
- B.Nucleus
- C.Cell wall
- D.Lysosome
15.
During cell division, chromatin condenses to form:
- A.Ribosomes
- B.Chromosomes
- C.Lysosomes
- D.Vacuoles
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
Mitochondria and chloroplasts both have their own DNA and 70S ribosomes. This supports the idea that they:
- A.Originated from free-living prokaryotes (endosymbiosis)
- B.Are not living
- C.Were made by the Golgi
- D.Have no function
17.
A cell actively pumps ions in against their concentration gradient. This requires:
- A.ATP energy (active transport)
- B.No energy (diffusion)
- C.Osmosis only
- D.The cell wall
18.
A gland cell that secretes large amounts of protein would be expected to have abundant:
- A.Rough ER and Golgi apparatus
- B.Chloroplasts
- C.Cell wall
- D.Centrioles
19.
Why can a plant cell placed in pure water not burst, while an animal cell may?
- A.The rigid cellulose cell wall resists the swelling
- B.Plant cells have no water
- C.Animal cells have a cell wall
- D.Plant cells have no membrane
20.
The inner membrane of a mitochondrion is folded into cristae mainly to:
- A.Increase the surface area for ATP-producing reactions
- B.Store food
- C.Make the cell wall
- D.Digest waste
21.
Red blood cells of mammals lack a nucleus, which means they cannot:
- A.Divide or make new proteins, so they have a short lifespan
- B.Carry oxygen
- C.Move in blood
- D.Be living
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Cell
- (B) Robert Hooke
- (C) Rudolf Virchow
- (C) A true (membrane-bound) nucleus
- (A) Cell wall
- (B) Fluid mosaic model
- (B) Cellulose
- (B) Proteins
- (A) Golgi apparatus
- (B) Digestive enzymes
- (B) Mitochondrion
- (A) Chloroplast
- (B) Protein synthesis
- (B) Nucleus
- (B) Chromosomes
Section B — Challenge / Olympiad (2 marks each)
- (A) Originated from free-living prokaryotes (endosymbiosis)
- (A) ATP energy (active transport)
- (A) Rough ER and Golgi apparatus
- (A) The rigid cellulose cell wall resists the swelling
- (A) Increase the surface area for ATP-producing reactions
- (A) Divide or make new proteins, so they have a short lifespan
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