NCERT Solutions Class 11 Biology Chapter 8

NCERT Class 11 Biology Chapter 8 explains the structure and functions of a cell. It also discusses the Eukaryotic and Prokaryotic cells. After students finish reading the chapter and understanding the concepts, they have to solve the practise questions. To help students find exact and accurate answers to these questions, Extramarks offers NCERT Solutions for Class 11 Biology Chapter 8.

NCERT Solutions for Class 11 Biology Chapter 8 – Cell The Unit of Life 

NCERT Solutions Class 11 Biology Chapter 8 help students find accurate answers to the questions given at the end of NCERT Biology Class 11 Chapter 8. The solutions are prepared by subject-matter experts who are familiar with CBSE guidelines.

Students can access the Extramarks solutions here.

Access NCERT Solutions for Class 11 Biology Chapter 8 – Cell The Unit of Life

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Q1. Which of the following is not true?

  1. Robert Brown discovered the cell
  2. Virchow explained that cells are made from pre-existing cells
  3. Schleiden Schwann formulated the theory of cell
  4. Life activities of a unicellular organism are carried out within a single cell

A1. The incorrect statement is – Robert Brown discovered the cell.

Q2. New cells generate from:

  1. Regeneration of old cells
  2. Pre-existing cells
  3. Bacterial fermentation
  4. Abiotic materials

A2. Pre-existing cells.

Q3. Which of the following is true?

  1. Both animal and plant cells have well-defined cell walls
  2. Cells of all living organisms have nucleus
  3. Cells are formed de novo from abiotic materials
  4. There are no membrane-bound organelles in prokaryotes

A3. Following is true – there are no membrane-bound organelles in prokaryotes.

NCERT Solutions for Class 11 Biology Chapter 8 – Cell The Unit of Life 

The experts at Extramarks have prepared NCERT Solutions for Class 11 Chapter 8 Biology to help students answer exam questions in a better way. The solutions are prepared as per the latest guidelines of CBSE, making them ideal study material for Class 11 Biology.

Class 11 Cell the Unit of Life NCERT Solutions 

Chapter 8 gives an overview of the cells and explains their structure and functions with the help of diagrams. Class 11 Biology Chapter 8 also discusses Prokaryotic cells and Eukaryotic cells and will make learning about a cell’s mechanism super interesting for students. All the answers related to this chapter can be found in the Class 11 Biology Chapter 8 NCERT Solutions. These solutions have been prepared with images and clear explanations in order to provide students with the best study material so that they may score well in examinations. 

CBSE Class 11 Biology Chapter 8 NCERT Solutions – Marks Distribution

CBSE Class 11 Biology has 70 marks for theory and 30 marks for practical. Here’s the unit-wise marks distribution:

Theory:

Units  Title Marks 
Unit I Diversity of Living Organisms  07 marks 
Unit II Structural Organisation in Plants and animals  11 marks
Unit III Cell: Structure and Function  15 marks 
Unit IV Plant Physiology 17 marks 
Unit V  Human Physiology 10+10 = 20 marks 
Total  70 marks 

Practicals:

Evaluation Scheme Marks 
A Major Experiment Part A – (Expt No. 1, 3, 7, 8) 05 marks
A Minor Experiment Part  – Expt No. 6, 9, 10, 11, 12, 13 04 marks 
Slide Preparation Part A (Expt No. 2, 4, 5) 05 marks 
Spotting Part B 07 marks 
Project record and Viva Voice  05 marks 
Practical record and Viva Voice 04 marks 
Total 30 marks 

Benefits of NCERT Biology Class 11 Chapter 8 

Important aspects of cells such as the cell as the basic unit of life, cell theory, cell structure and function, different types of cells, different parts of cells, etc. are discussed in this Class 11 Biology Chapter 8 in a lot of detail. Here’s why students should refer to NCERT Solutions Class 11 Biology Chapter 8:

  • All the fundamental concepts about cells and other concepts related to them are covered well in the NCERT Solutions.
  • Solutions focus on answering a question in a step-by-step manner. Students can use the same pattern in exams to score better marks. 
  • Concepts are covered well in an elaborate but simple manner in the solutions.
  • All solutions are researched, checked, and framed by experts of the subject matter.
  • Tables and diagrams have been used to make the concepts easy to understand and interesting to learn.

FAQs (Frequently Asked Questions)

The term “cell” was derived from the Latin word “cella” (which means small room). Fundamental molecules of life are contained in a cell. All living things are composed of cells. A cell is said to be the basic unit of life or the structural and functional unit of life. 

Plants and animals are both composed of cells. A cell is the smallest independent component in an organism. 

Mesosome is a structure formed in a prokaryotic cell. It is formed by the plasma membrane’s invagination and functions as follows:

  • It aids in the process of respiration and secretion. 
  • It facilitates several enzymatic activities by increasing the plasma membrane’s surface. 
  • It functions to aid in the distribution of DNA replication.

All living organisms are made up of cells; therefore, a cell is known as the structural as well as the functional unit of life. Cells exhibit characteristics of life and are crucial in carrying out various life processes that are needed to sustain life. They are said to be the primary form of life that provide form and structure. They process nutrients and then convert these nutrients into usable energy. Specific functions of specific organisms are carried out by cells. There are multicellular organisms and unicellular organisms. Multicellular organisms have complex functions that are executed by specialised cells that carry out particular functions.

 The functions of a cell are:

  • A cell helps in the process of mitosis as the parent cell divides into a daughter cell and aids the growth of an organism. 
  • The cell membrane and cell wall aid in providing an organism with support and structure. 
  • Execution of chemical processes requires energy. Cells produce this energy with the help of respiration in animals and photosynthesis in plants. 
  • Cells help in reproduction with the help of processes called Meiosis and Mitosis. Meiosis is a process that results in daughter cells that are genetically different from parent cells. Mitosis is an asexual reproduction process where parent cells split to form daughter cells. 
  • Cells help in the transport of substances as well. To perform multiple chemical processes, cells import various nutrients and carry out active and passive transport of waste from chemical processes to eliminate it. 

Golgi bodies have the following functions

  • They create lysosomes.
  • Transport lipids around the cell.
  • Aid in secretion by packaging and sorting proteins.

German scientists Rudolf Virchow, Theodor Schwann, and Matthias Schleiden proposed the cell theory, which says that all species on earth are made of cells; a cell is a basic unit of life, and every cell arises from pre-existing cells. This theory’s modern version includes postulates that say energy flows within the cells; genetic information is passed down from one cell to the other, and the chemical composition of all cells is the same.

The nucleus contains the DNA (hereditary material of the cell) and is responsible for the regulation of most forms of cellular activity. A nuclear envelope surrounds the nucleus that separates the DNA from the rest of the cell and protects it.

Mitochondria (a double membrane-bound organelle) can be found in the cytoplasm of most eukaryotic organisms. German scientist Rochard Altman first described it in 1890. They function as a cell’s digestive system and are known as the “powerhouse of the cell.” A major role is played by mitochondria in breaking down nutrients and generating molecules that are energy-rich. Mitochondrion (singular of mitochondria) is a term derived from the Greek words “mitos” which means “thread” and “chondros” which means “granule.” 

The cytoplasm is a substance present inside the cell membrane. It is thick and jelly-like, and most of the cell’s chemical reactions take place in it. Vacuoles, mitochondria, endoplasmic reticulum, etc. are some of the cell organelles suspended in the cytoplasm. 

Class 11 Biology Chapter 8 is not as tough to score once you understand the concepts well. Extramarks’ solutions and online live classes will make the process of understanding different topics in the subject easy. The solutions are framed by experts and the online live classes can help you clear up any confusion about any topic. One can visit the Extramarks app or website to download the solutions for free.