NCERT Class VIII Science Solutions: Chapter 8-Cell Structure and Functions Part 3

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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

Brick Wall and Onion Peel

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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

Crossword

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Answer:

Across:

  • Chlorophyll.

  • Organelle.

  • Protoplasm.

  • Genes

Down:

  • Chloroplasts.

  • Organ.

  • Membrane.

  • Vacuole.

  • Tissue.

As showing in image is a crossword Answer

Crossword Answer

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