2. The Invisible Living World: Beyond Our Naked Eye – Textbook Worksheet

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Multiple Choice Questions (MCQs)

Instruction: Select the correct option for each question.

  1. Who first used the term “cell” after observing thin slices of cork?
    a) Antonie van Leeuwenhoek
    b) Robert Hooke
    c) Louis Pasteur
    d) Ananda Mohan Chakrabarty
  2. Which tool allows us to view objects too small to be seen with the naked eye?
    a) Telescope
    b) Periscope
    c) Microscope
    d) Binoculars
  3. A round-bottom flask filled with water can act as:
    a) A lens/magnifier
    b) A telescope
    c) A prism
    d) A mirror
  4. Which cell structure is present in plant cells but absent in animal cells?
    a) Nucleus
    b) Cell membrane
    c) Cell wall
    d) Cytoplasm
  5. Which statement is true about cheek cells?
    a) They are rectangular and have a cell wall.
    b) They have a large central vacuole. 
    c) They contain chloroplasts.
    d) They are polygon-shaped and lack a cell wall.
  6. Which part of the cell controls all activities like growth and division?
    a) Cytoplasm
    b) Nucleus
    c) Cell membrane
    d) Vacuole
  7. Spirulina is best described as:
    a) A microalga used as a superfood
    b) A nitrogen-fixing bacterium
    c) A fungus used in bread making
    d) A protozoan that causes disease
  8. Which microorganism helps convert milk into curd?
    a) Yeast
    b) Rhizobium
    c) Lactobacillus
    d) Amoeba

Milk to Curd

Fill in the BlanksInstruction: Fill in the blanks with the correct word based on the chapter.

  1. The jelly-like substance inside a cell where life processes occur is the ______.
  2. The thin, flexible boundary of a cell that controls entry and exit is the ______ ______.
  3. In onion peel cells, staining with ______ helps make the cells visible.
  4. Cheek cells are commonly stained with ______ ______.

    Cheek Cells
  5. The bacteria that fix nitrogen in legume root nodules are called ______.
  6. The process by which yeast makes dough rise by releasing carbon dioxide is called ______.
  7. Bacterial genetic material without a nuclear membrane is found in a region called the ______.

Very Short Answer Questions 

Instruction: Answer the following questions in one line.

  1. Who is known as the Father of Microbiology?
  2. What do chloroplasts contain that enables photosynthesis?
  3. Name the large storage cavity commonly found in plant cells.
  4. What shape are muscle cells typically described as?
  5. Which organisms decompose waste to form manure?

Short Answer QuestionsInstruction: Answer the following questions in 2–3 lines.

  1. Why are some microorganisms invisible to the naked eye?
  2. How does high salt or sugar preserve pickles and murabbas?
  3. How do nerve cells (neurons) suit their function?
  4. Why is warm milk preferred for curd formation?
  5. What role do microalgae play in Earth’s oxygen supply?

Match the Following 

Instruction: Match Column A with the correct option in Column B.

Check worksheet solutions here.