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Class 9 Exam  >  Class 9 Notes  >  Practice Questions, Fundamental Unit of Life Science, Class 9, Science

Class 9 Science Chapter 5 Practice Question Answers - The Fundamental Unit of Life

Very short Answer type Question

1. Why are mitochondria called the power house of the cell?

2. What name is given to the Golgi apparatus occurring in plant cells? Why is it named differently in plant cells?

3. Why are lysosomes called scavengers?

4. What are suicide bags? Why are they called so?

5. What for ATP stands?

6. Name the nucleic acids that are present in an animal cell.

7. What is the function of mitochondria?

8. What would happen if plasma membrane ruptures or breaks down?

9. Describe what do you understand by totipotency.

10. Name the cell organelle in plant cell that is involved in photorespiration and b-oxidation of fatty acids.

 

 Short Answer type Question

1. List various advantanges of division of labour.

2. How does a cell act as basic structural and functional unit of an organism.

3. How is rough ER different from smooth ER? What functions do they perform in a cell?

4. What are different types of plastids? What are their functions?

5. Describe the functions of Golgi complex.

6. What would happen to the life of a cell if there was no Golgi apparatus?

 

 Long Answer type Question

1. Explain the structure of nucleus. What is its function?

 

2. What is the main function of each of the following organelles:

(i) Cell wall (ii) Plasma membrane (iii) Chromosomes (iv) Nucleolus

(v) Mitochondria (vi) Chloroplasts (vii) Golgi apparatus (viii) Lysosomes (ix) Centrioles (x) Vacuoles.

 

3. Distinguish between:

(i) Ribosome and centrosome (ii) Cell wall and cell membrane.

 

4. Comment of the following :

(i) Chloroplast is called "Kitchen of the cell"

(ii) Chloroplast is semi-autonomous structure

(iii) Lysosomes are Garbage disposer.

(iv) Lysosomes are polymorphic cell organelle.

 

5. Describe structure and function of the following :

(i) Plasma membrane,

(ii) Endoplasmic reticulum

(iii) Chloroplast

(iv) Golgi apparatus

 

Give answers of following questions :_

1. What is cell?

2. Differentiate a plant cell and an animal cell.

3. What is the structural and functional unit of life?

4. What are three basic criteria for defining the cell?

5. Give any three examples of unicellular organisms.

 

 Write the technical terms for the following :_

(i) An organism whose body is made up of many cells.

(ii) An organism whose cells do not have well organised nucleus

(iii) The living substance present inside the cell.

The document Class 9 Science Chapter 5 Practice Question Answers - The Fundamental Unit of Life is a part of Class 9 category.
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FAQs on Class 9 Science Chapter 5 Practice Question Answers - The Fundamental Unit of Life

1. What is the fundamental unit of life?
Ans. The fundamental unit of life is a cell. All living organisms are made up of one or more cells. It is the smallest structural and functional unit of an organism.
2. What are the different types of cells?
Ans. There are two main types of cells - Prokaryotic and Eukaryotic cells. Prokaryotic cells are found in bacteria and archaea, while eukaryotic cells are found in plants, animals, fungi, and protists.
3. What is the function of cell membrane?
Ans. The cell membrane is a thin, semipermeable layer that surrounds the cell and separates its internal environment from the external environment. It controls the movement of substances in and out of the cell and provides structural support to the cell.
4. What is the function of mitochondria?
Ans. Mitochondria are called the powerhouse of the cell as they are responsible for producing energy in the form of ATP. They are involved in cellular respiration and play a crucial role in the metabolism of the cell.
5. What is the difference between plant and animal cells?
Ans. Plant cells have a cell wall, chloroplasts, and a large central vacuole, which are absent in animal cells. Animal cells have centrioles, which are absent in plant cells. Additionally, plant cells are usually rectangular or square-shaped, while animal cells are usually round or irregularly shaped.
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