Eukaryotic Cells MCQs Quiz | Class 9

Test your understanding of Eukaryotic Cells for Class IX Science (Unit II: Organization in the Living World). This quiz covers key features, examples of eukaryotic organisms, the concept of a true nucleus, and membrane-bound organelles. Attempt these 10 MCQs to check your knowledge, view your score instantly, and download the detailed solution PDF for revision.

Understanding Eukaryotic Cells

Eukaryotic cells are complex cells that contain a true nucleus and membrane-bound organelles. They are the building blocks of plants, animals, fungi, and protists. Unlike prokaryotic cells, eukaryotes have a highly organized internal structure.

Key Features of Eukaryotic Cells

  • Defined Nucleus: The genetic material (DNA) is enclosed within a nuclear membrane, separating it from the cytoplasm.
  • Membrane-Bound Organelles: These cells contain specialized structures like mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles (in plants).
  • Size: Generally larger than prokaryotic cells (typically 5 to 100 micrometers).
  • Chromosomes: DNA is organized into multiple linear chromosomes associated with histone proteins.

Comparison: Eukaryotic vs. Prokaryotic Cells

Feature Prokaryotic Cell Eukaryotic Cell
Nucleus Absent (Nucleoid region) Present (True nucleus)
Organelles Membrane-bound absent Present (e.g., Mitochondria)
Cell Type Mostly Unicellular Unicellular or Multicellular
Ribosomes 70S 80S (in cytoplasm)

Examples of Eukaryotes

The domain Eukarya includes four major kingdoms:

  1. Protista: Usually unicellular organisms like Amoeba, Paramecium, and Euglena.
  2. Fungi: Includes yeasts (unicellular), molds, and mushrooms. They have cell walls made of chitin.
  3. Plantae: Multicellular plants with cell walls made of cellulose and chloroplasts for photosynthesis.
  4. Animalia: Multicellular animals lacking cell walls.

Quick Revision Points

  • The term “Eukaryote” comes from Greek words eu (true) and karyon (nucleus).
  • Mitochondria are often called the “powerhouse” of the cell.
  • Plant cells are distinguished from animal cells by the presence of a cell wall and chloroplasts.

Extra Practice Questions

  • 1. Name two organelles present in plant cells but absent in animal cells.
  • 2. What is the function of the nuclear membrane?
  • 3. Why are viruses not considered eukaryotic cells?
  • 4. Differentiate between 70S and 80S ribosomes.
  • 5. Give an example of a unicellular fungus.