Practice

The Invisible Living World: Beyond Our Naked Eye — Practice

15 questions 15 min Recall + understand

Q1. The human eye can only see objects that are
- A. Brightly coloured
- B. Above a certain size
- C. Made up of cells
- D. Living organisms
Q2. A curved piece of glass that magnifies small things was called a lens because its shape resembled the seed of a
- A. Mustard
- B. Wheat grain
- C. Lentil (masur dal)
- D. Mango
Q3. The scientist who first used the word 'cell' in 1665 after observing a thin slice of cork was
- A. Robert Hooke
- B. Antonie van Leeuwenhoek
- C. Ananda Mohan Chakrabarty
- D. Louis Pasteur
Q4. Antonie van Leeuwenhoek is known as the Father of Microbiology because he was the first to clearly
- A. Discover penicillin
- B. Patent an oil-eating bacterium
- C. Coin the word 'cell'
- D. See and describe bacteria and blood cells
Q5. The basic unit of life in all living organisms is the
- A. Tissue
- B. Cell
- C. Organ
- D. Nucleus
Q6. The three basic parts of a typical cell are
- A. Cell wall, chloroplast, vacuole
- B. Nucleus, mitochondria, plastid
- C. Cell membrane, cytoplasm, nucleus
- D. Tissue, organ, organ system
Q7. The cell membrane is described as porous because it
- A. Allows entry of essential materials and exit of wastes
- B. Stores food for the cell
- C. Provides green colour to the cell
- D. Has chlorophyll inside
Q8. Which part of the cell regulates all activities that occur within the cell and also regulates its growth?
- A. Cell wall
- B. Cytoplasm
- C. Cell membrane
- D. Nucleus
Q9. The cytoplasm contains compounds such as
- A. Only water and air
- B. Carbohydrates, proteins, fats, and mineral salts
- C. Only chlorophyll and starch
- D. Only nucleic acids
Q10. An extra outer layer present in plant cells but absent in animal cells is the
- A. Cell membrane
- B. Nucleus
- C. Cell wall
- D. Cytoplasm
Q11. Chloroplasts contain chlorophyll that makes plants green and helps in photosynthesis. Chloroplasts are found in
- A. Plant cells only
- B. Animal cells only
- C. Bacterial cells only
- D. All living cells equally
Q12. In the word 'microorganism', the prefix 'micro' means
- A. Very small
- B. Many
- C. Without water
- D. Without air
Q13. Students observing pond water and soil suspension identified microorganisms as four categories. These four categories are
- A. Plants, animals, fungi, viruses
- B. Bacteria, viruses, plants, animals
- C. Insects, worms, fungi, algae
- D. Protozoa, algae, fungi, and bacteria
Q14. Viruses are considered different from other microorganisms because viruses are
- A. Made of many cells
- B. Found only in cold places
- C. Microscopic and acellular
- D. Visible to the naked eye
Q15. Dough kneaded with yeast becomes soft and fluffy because yeast releases
- A. Carbon dioxide bubbles
- B. Oxygen bubbles
- C. Water vapour
- D. Nitrogen gas

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