NCERT Class VIII Science Solutions: Chapter 8-Cell Structure and Functions Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 8:

‘Cells are the basic structural units of living organisms’ . Explain.

Answer:

Both, bricks in a building and cells in the living organisms, are basic structural units. All basic functions for the organism survival take place inside cells. As bricks assemble to make a building, cells assemble to make the body of every organism. A group of cells form a tissue which performs a specific function. A group of tissue forms an organ and in the same way a group of organs from an organism. That is why cells are considered as the basic structural units of living organisms.

As Showing in Image is a Brick Wall and Onion Peel

Question 9:

Explain why chloroplasts are found only in plant cells?

Answer:

Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps cell energy and use it to prepare food for plants.

Question 10:

Complete the crossword with the help of clues given below:

Across:

  • This is necessary for photosynthesis.
  • Term for component present in the cytoplasm.
  • The living substance in the cell.
  • Units of inheritance present on the chromosomes.

Down:

  • Green plastids.
  • Formed by collection of tissues.
  • It separates the contents of the cell from the surrounding medium.
  • Empty structure in the cytoplasm.
  • A group of cells.
As Showing in Image is a Crossword

Answer:

Across:

  • Chlorophyll.
  • Organelle.
  • Protoplasm.
  • Genes

Down:

  • Chloroplasts.
  • Organ.
  • Membrane.
  • Vacuole.
  • Tissue.
As Showing in Image is a Crossword Answer

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