NCERT solutions for class 9 science chapter 5 The fundamental unit of life: In this article, you will study that most mature plant cells have a large central vacuole that helps to maintain the turgidity of the cell and stores important substances including wastes. The CBSE NCERT solutions for class 9 science chapter 5 The Fundamental Unit of Life contains questions and solutions of all the topics and exercises mentioned in the chapter. The NCERT solutions aim at helping you solve difficult questions. Through this chapter, you will also get to know that, Prokaryotic cells have no membrane-bound organelles, their chromosomes are composed of only nucleic acid, and they have only very small ribosomes as organelles. Cells in organisms divide for growth of body, for replacing dead cells, and for forming gametes for reproduction. If you have any problem in answering the questions or you are not getting the correct answers then don't worry, solutions for NCERT class 9 science chapter 5 The Fundamental Unit of Life is there for you to help. It will give you solutions to all the questions which are mentioned in the NCERT textbook.
Here are the important topics of NCERT solutions for class 9 science chapter 5 The fundamental unit of life mentioned below:
5.1 What Are Living Organisms Made up of?
5.2 What Is a Cell Made up Of? What Is the Structural Organisation of a Cell?
5.2.1 Plasma Membrane or Cell Membrane
5.2.2 Cell Wall
5.2.5 Cell Organelles
5.2.5 (i) Endoplasmic Reticulum (ER)
5.2.5 (ii) Golgi Apparatus
5.2.5 (iii) Lysosomes
5.2.5 (iv) Mitochondria
5.2.5 (v) Plastids
5.2.5 (vi) Vacuoles
NCERT solutions for class 9 science chapter 5 the fundamental unit of life
Topic 5.1 What are Living Organisms made up
Q. 1. Who discovered cells, and how?
Cells were discovered in 1665 by Robert Hooke. He was examining a thin slice of cork using a primitive microscope designed by himself. He saw that the structure of the cork at a microscopic level is similar to that of a honeycomb. It had several small chambers like those in a honeycomb.
These small chambers were termed as cells.
Solutions for NCERT for class 9 chapter 5 The Fundamental Unit of Life
Topic 5.2.2 Cell Wall
Q. 1. Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.
|1. Size generally small.
1. Size generally large.
|2. Nuclear Region: Poorly defined because of the absence of cell membranes and is called the nucleoid.
2. Nuclear Region: Well defined and surrounded by a nuclear membrane.
|3. Chromosome: single.
3. More than one chromosome.
|4. Membrane-bound cells organelles present
||4. Membrane-bound cell organelles absent.
Q. 3. Why are lysosomes known as suicide bags?
When the cells are damaged to such an extent that they are incapable of performing certain functions which are essentials for survival, the organism tries to get rid of these cells.
For this function, the lysosomes which are membrane-bound organelles burst and release digestive enzymes called lysozymes which destruct the cell and lysosomes are therefore called suicide bags.
NCERT solutions for class 9 science chapter 5 The fundamental unit of life - Solved Exercise Solutions
Q1. Make a comparison and write down ways in which plant cells are different from animal cells.
|1. Plant cells are generally bigger than animal cells.
||1. Animal cells are relatively small.
|2. Plant cells have a cell wall.
||2. Animal cells do not have a cell wall.
|3. The nucleus is not present in the centre of the cell.
||3. The nucleus is there at the center of the cell.
|4. The size of the vacuole is large.
||4. The size of the vacuole is small.
|5. A chloroplast is present.
||5. A chloroplast is absent.
Q2. How is a prokaryotic cell different from a eukaryotic cell?
1. A prokaryotic cell is quite small in size.
( 1 - 10 pm)
1. A eukaryotic cell is relatively larger.
|2. The nuclear region is poorly defined as the nuclear membrane is absent.
2. The nuclear membrane is present and the nuclear region is well defined.
|3. Organelles are not membrane-bound.
||3. Organelles are membrane-bound.
|4. Only one chromosome is present.
||4. More than one chromosome is present.
Q7. How does an Amoeba obtain its food?
Amoeba obtains its food by the virtue of the flexibility of its shape.
Amoeba entraps the food particle around its membrane and then engulfs it within the cytoplasm. This process is called endocytosis.
Q8. What is osmosis?
Osmosis is the movement of water from a region of low concentration of solute(high water concentration) to a region of high concentration of solute(low water concentration) through a semi-permeable membrane.
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