Cell Structure and Function – Cell Theory & Organelles Quiz - ICSE Class 11 Biology

Free practice quiz: Cell Structure and Function – Cell Theory & Organelles (ICSE Class 11 Biology). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Biology practice quiz has 50 multiple-choice questions on Cell Structure and Function – Cell Theory & Organelles, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following organelles is primarily responsible for the synthesis of steroid hormones and detoxification of drugs and poisons in eukaryotic cells?

   1. Rough Endoplasmic Reticulum
   2. Smooth Endoplasmic Reticulum
   3. Golgi Apparatus
   4. Lysosomes
   Show answer

   Answer: B. Smooth Endoplasmic Reticulum

   The Smooth Endoplasmic Reticulum (SER) lacks ribosomes and is involved in lipid metabolism, steroid hormone synthesis, and detoxification of drugs and poisons. The Rough ER is involved in protein synthesis and modification.

2. Which scientist is credited with the invention of the microscope, leading to the discovery of cells?

   1. Antonie van Leeuwenhoek
   2. Robert Hooke
   3. Matthias Schleiden
   4. Theodor Schwann
   Show answer

   Answer: B. Robert Hooke

   Robert Hooke, in 1665, was the first to observe and describe cells using a microscope he built. He famously coined the term 'cell' after observing the structure of cork.

3. Which cellular component is responsible for the synthesis of ribosomal RNA (rRNA) and the assembly of ribosomal subunits?

   1. Nucleus
   2. Nucleolus
   3. Endoplasmic Reticulum
   4. Golgi Apparatus
   Show answer

   Answer: B. Nucleolus

   The nucleolus is a specialized structure within the nucleus that is the primary site of rRNA synthesis and the assembly of ribosomal proteins into functional ribosomes.

4. The membrane-bound sacs containing hydrolytic enzymes that break down macromolecules and cellular waste are called:

   1. Vacuoles
   2. Lysosomes
   3. Peroxisomes
   4. Vesicles
   Show answer

   Answer: B. Lysosomes

   Lysosomes are organelles containing hydrolytic enzymes that digest various biomolecules and waste products within the cell. They are formed from the Golgi apparatus.

5. The historical development of the cell theory involved contributions from several scientists. Which of these statements accurately reflects this development?

   1. Hooke discovered cells, Schleiden and Schwann proposed all organisms are made of cells, and Virchow added that cells arise from pre-existing cells.
   2. Schleiden and Schwann discovered the nucleus, while Hooke identified cell division.
   3. Virchow first observed cells, leading to the theory that all cells are similar.
   4. Leeuwenhoek proposed that cells are the basic units of life, and Hooke discovered organelles.
   Show answer

   Answer: A. Hooke discovered cells, Schleiden and Schwann proposed all organisms are made of cells, and Virchow added that cells arise from pre-existing cells.

   Robert Hooke first observed and named cells. Matthias Schleiden and Theodor Schwann formulated the idea that all plants and animals are composed of cells. Rudolf Virchow later contributed the principle that all cells come from pre-existing cells.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The 'powerhouses' of the cell, responsible for cellular respiration and ATP production, are:
2. Which organelle contains hydrolytic enzymes and is responsible for breaking down waste materials and cellular debris?
3. The process of protein synthesis and folding is primarily carried out by:
4. Which cellular structure is responsible for modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles?
5. The cell theory, in its modern form, states that all cells arise from pre-existing cells. This principle was most notably contributed by which scientist?
6. Which component of the cell is responsible for maintaining cell shape, providing mechanical support, and facilitating cell movement through the cytoskeleton?
7. The nucleolus, located within the nucleus, is primarily responsible for:
8. Which of the following statements best reflects the fluid mosaic model of the plasma membrane?
9. The endosymbiotic theory proposes that mitochondria and chloroplasts originated from:
10. The term 'prokaryote' refers to cells that:
11. The cell wall of plant cells is primarily composed of which polysaccharide?
12. Which organelle is involved in the synthesis of lipids, metabolism of carbohydrates, and detoxification of drugs and poisons in eukaryotic cells?
13. The bacterial flagellum, a common organelle for motility in bacteria, is structurally different from eukaryotic flagella because it:
14. In eukaryotic cells, the primary site of protein glycosylation and lipid synthesis is the:
15. Centrioles, typically found in animal cells, are involved in:
16. Which of the following is a unique characteristic of eukaryotic cells compared to prokaryotic cells?
17. The selective permeability of the plasma membrane is primarily due to the properties of:
18. The concept that all living organisms are made of cells was first proposed by:
19. The cytoplasm of a eukaryotic cell includes all of the following EXCEPT:
20. The primary function of plasmodesmata in plant cells is to:
21. Which organelle is characterized by a double membrane, its own circular DNA, and the ability to replicate independently of the cell cycle?
22. The cytoskeleton is a network of protein filaments that provides structural support and enables cell movement. The three main types of cytoskeletal elements are:
23. Vaults are a newly discovered class of ribonucleoprotein particles found in the cytoplasm of eukaryotic cells. Their exact function is still under investigation, but they are hypothesized to be involved in:
24. The plasma membrane exhibits selective permeability, controlling the passage of substances into and out of the cell. This property is largely determined by the:
25. Which of the following accurately describes the relationship between the endoplasmic reticulum and the Golgi apparatus?
26. The discovery of the nucleus as a distinct organelle within eukaryotic cells is most closely associated with the work of:
27. Which statement about prokaryotic cells is correct?
28. The fluid mosaic model describes the plasma membrane as a dynamic structure where phospholipids and proteins can move laterally. This fluidity is primarily influenced by:
29. Which of the following is a fundamental tenet of the cell theory, established by its early proponents?
30. In eukaryotic cells, the synthesis of phospholipids and cholesterol occurs primarily in the:
31. The primary role of the nucleolus within the nucleus is:
32. Which of the following components is unique to prokaryotic cells and absent in eukaryotic cells?
33. The function of the Golgi apparatus is to modify, sort, and package proteins and lipids for secretion or delivery to other organelles. This process involves:
34. Which cytoskeletal element is involved in cell shape, muscle contraction, and cell division (cytokinesis)?
35. Peroxisomes are organelles that contain enzymes to break down fatty acids and detoxify harmful substances. A key product of their activity that is then broken down by catalase is:
36. The selective uptake of molecules by the cell membrane through invagination of the membrane to form a vesicle is known as:
37. Which organelle serves as the primary site for ATP synthesis through aerobic respiration in eukaryotic cells?
38. The internal membrane system of eukaryotic cells, including the endoplasmic reticulum and Golgi apparatus, is part of the:
39. Which structural component is characteristic of the cell wall of fungi?
40. The '9+2' arrangement of microtubules is a characteristic feature of:
41. Which of the following accurately describes the function of the cytoskeleton?
42. The lipid bilayer of the plasma membrane is most permeable to:
43. Which of the following is considered an organelle?
44. The cell theory states that all cells contain genetic material. This genetic material is found in the form of:
45. Which component of the plasma membrane is primarily responsible for the selective transport of ions and polar molecules across the membrane?

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