NCERT Solutions Class 11 Biology Chapter 8 The Unit of Life – Here are all the NCERT solutions for Class 11 Biology Chapter 8. This solution contains questions, answers, images, explanations of the complete chapter 8 titled The Unit of Life of Biology taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Biology, then you must come across chapter 8 The Unit of Life. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Biology Chapter 8 The Unit of Life in one place.
NCERT Solutions Class 11 Biology Chapter 8 The Unit of Life
Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Biology for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.
For a better understanding of this chapter, you should also see summary of Chapter 8 The Unit of Life , Biology, Class 11.
Class | 11 |
Subject | Biology |
Book | Biology |
Chapter Number | 8 |
Chapter Name |
The Unit of Life |
NCERT Solutions Class 11 Biology chapter 8 The Unit of Life
Class 11, Biology chapter 8, The Unit of Life solutions are given below in PDF format. You can view them online or download PDF file for future use.
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Question & Answer
Q.1: 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) Robert Brown did not discover the cell. The cell was discovered by Robert Hooke.
Q.2: New cells generate from
(a) bacterial fermentation
(b) regeneration of old cells
(c) pre-existing cells
(d) abiotic materials
Ans : (c) According to the biogenic theory, new cells can only arise from pre-existing cells. Only complete cells, in favourable conditions, can give rise to new cells.
Q.3: 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) Membrane-bound organelles are organelles surrounded by a double membrane. Nucleus, mitochondria, chloroplasts, etc., are examples of such organelles. These cell organelles are absent from prokaryotes. (a) Only eukaryotic cells have nuclei. They are absent from prokaryotes. (b) Cell walls are only present in plant cells. They are absent from all animal cells. (d) All cells arise from pre-existing cells.
Q.4: What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
Ans : Mesosome is a convoluted membranous structure formed in a prokaryotic cell by the invagination of the plasma membrane. Its functions are as follows: (1) These extensions help in the synthesis of the cell wall, replication of DNA. They also help in the equal distribution of chromosomes into the daughter cells. (2) It also increases the surface area of the plasma membrane to carry out various enzymatic activities. (3) It helps in secretion processes as well as in bacterial respiration.
Q.5: 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 : Plasma membrane is the outermost covering of the cell that separates it from the environment. It regulates the movement of substances into the cell and out from it. It allows the entry of only some substances and prevents the movement of other materials. Hence, the membrane is selectively-permeable. Movement of neutral solutes across the cell membrane — Neutral molecules move across the plasma membrane by simple passive diffusion. Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration. Movement of polar molecules across the cell membrane — The cell membrane is made up of a phospholipid bilayer and proteins. The movement of polar molecules across the non-polar lipid bilayer requires carrier-proteins. Carrier-proteins are integral protein particles having certain affinity for specific solutes. As a result, they facilitate the transport of molecules across the membrane.
NCERT / CBSE Book for Class 11 Biology
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- Click here for NCERT Book for Class 11 Biology
- Click here to buy NCERT Book for Class 11 Biology
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