CBSE  /  Class 9  /  Science  /  The Fundamental Unit of Life

  • 1. 
    Which of the following can be made into crystal?

  • A bacterium
  • An Amoeba
  • A virus
  • A sperm

  • 2. 
    A cell will swell up if

  • the concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.
  • the concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell.
  • the concentration of water molecules is same in the cell and in the surrounding medium.
  • concentration of water molecules does not matter.

  • 3. 
    Chromosomes are made up of

  • DNA
  • Protein
  • DNA and protein
  • RNA

  • 4. 
    Which of these is not related to endoplasmic reticulum?

  • It behaves as a transport channel for proteins between nucleus and cytoplasm.
  • It transports materials between various regions in the cytoplasm.
  • It can be the site of energy generation.
  • It can be the site for some biochemical activities of the cell.

  • 5. 
    Following are a few definitions of osmosis:

  • Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.
  • Movement of solvent molecules from its higher concentration to lower concentration.
  • Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane.
  • Movement of solute molecules from lower concentration to higher concentration of solution through a semi permeable membrane.

  • 6. 
    Plasmolysis in a plant cell is defined as

  • breakdown (lysis) of plasma membrane in hypotonie medium
  • shrinkageof cytoplasm in hypertonic medium
  • shrinkage of nucleoplasm
  • none of them

  • 7. 
    Which of the following are covered by a single membrane?

  • Mitochondria
  • Vacuole
  • Lysosome
  • Plastid

  • 8. 
    Find out the false sentence.

  • Nucleus is involved with the formation of lysosomes.
  • Nucleus, mitochondria and plastid have DNA, hence they are able to make their own structural proteins.
  • Mitochondria is said to be the power house of the cell as ATP is generated in them.
  • Cytoplasm is called as protoplasm.

  • 9. 
    Find out the correct sentence.

  • Enzymes packed in lysosomes are made through RER (rough endoplasmic reticulum).
  • Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively.
  • Endoplasmic reticulum is rĂ©lated to the destruction of plasma membrane.
  • Nucleoid is present inside the nucleoplasm of eukaryotic nucleus.

  • 10. 
    Which cell organelle plays a crucial role in detoxifring many poisons and drugs in a cell?

  • Golgi apparatus
  • Lysosomes
  • Smooth endoplasmic reticulum
  • Vacuoles
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