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Cell The Unit of Life: CBSE Class 11 NCERT Solution

Aug 12, 2015 18:03 IST

    Find the CBSE Class 11 Biology NCERT Solution for the Chapter- 8, Cell The Unit of Life. It has been framed keeping the Students' perspective in mind. This will help the Students with easy and simple understanding of the concept and technique employed in solving as per the CBSE Marking Scheme.

    To get the Complete NCERT Solution, Click Here

    Few Sample Question from this Chapter are given below:

    Q. Which of the following is not correct?

    (a) Robert Brown discovered the cell.

    (b) Schleiden and Schwann formulated the cell theory.

    (c) Virchow explained that cells are formed from pre-existing cells.

    (d) A unicellular organism carries out its life activities within a single cell.

    Ans. (a) is not correct.

    Q. New cells generate from

    (a) Bacterial fermentation                  (b) Regeneration of old cells

    (c) Pre-existing cells                          (d) Abiotic materials

    Ans. (c) New cells generate from from pre-existing cells.

    Q. Which of the following is correct?

    (a) Cells of all living organisms have a nucleus.

    (b) Both animal and plant cells have a well defined cell wall.

    (c) In prokaryotes, there are no membrane bound organelles.

    (d) Cells are formed de novo from abiotic materials.

    Ans. (c) In prokaryotes, there are no membrane bound organelles.

    Q. What is a mesosome in a prokaryotic cell? Mention the functions that it performs.

    Ans. Mesosome is a specialised membranous structure formed in a prokaryotic cell by the extension of the plasma membrane into the cell.

    Some of the important functions mesosome are:

    (i) It helps in the synthesis of the cell wall, DNA replication and equal  distribution of chromosomes into the daughter cells.

    (ii) It also increases the surface area of the plasma membrane and enzymatic content.

    (iii) It helps in respiration as well as secretion processes.

    Q. How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?

    Ans. Neutral solutes may move across the plasma membrane by the process of simple diffusion or osmosis (in case of waster). Diffusion is the process of movement of molecules from a region of higher concentration to a region of lower concentration whereas the movement of water along the concentration gradient is termed as osmosis. But the polar molecules require some carrier-proteins to facilitate their movement across the non-polar lipid bilayer.

    To get the Complete NCERT Solution, Click Here

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