CBSE Class 11 Biology NCERT Solutions: Chapter 8, Cell: The Unit of Life
NCERT books are very important for examination preparation as these books help in clearing out the theoretical concepts and strengthening the students’ foundation in the subject. Moreover, NCERT books offer a number of problems based on each conceptual topic which students must solve or answer to assess their understanding of the different topics learned in a chapter of the book. Solving the questions given at the end of each chapter of NCERT book, assures positive results as these questions are generally asked in exams directly or in twisted manner.
Here we have collated the NCERT solutions for CBSE Class 11 Biology chapter 8, Cell: The Unit of Life. Here, students can find a better approach to the questions given at the end of chapter- Structure of the Atom in NCERT textbook. All these solutions have been prepared by the subject experts and have been revised to bring accurate study material for our students.
All the class 11 Biology NCERT solutions are available in PDF format which students may easily download free of cost.
Some of the questions and their solutions from NCERT Solutions for Class 11: Cell: The Unit of Life, are as follows:
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.
Get the complete the NCERT solutions for Class 11: Cell: The Unit of Life, from the following link:
Students may download the NCERT solutions for Class 11 Biology chapter- Cell: The Unit of Life, in the form of PDF.
Class 11 Biology NCERT Chapter: Cell: The Unit of Life
Before solving the questions given in the Class 11 Biology NCERT chapter- Cell: The Unit of Life, students are advised to thoroughly read this chapter to grasp all the concepts explained in it. This will help you understand the problem discussed in a question and then come with an appropriate answer.
Main topics discussed in Class 11 Biology chapter: Cell: The Unit of Life are:
- Cell theory
- An overview of cell
- Prokaryotic cells
- Cell envelope and its modifications
- Ribosomes and inclusion bodies
- Eukaryotic cells
- Cell membrane
- Cell wall
- Endomembrane system
- Cilia and flagella
- Centrosome and centrioles
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