CBSE Class 9 Biology The Fundamental Unit Of Life Notes

Download CBSE Class 9 Biology The Fundamental Unit Of Life Notes in PDF format. All Revision notes for Class 9 Biology have been designed as per the latest syllabus and updated chapters given in your textbook for Biology in Standard 9. Our teachers have designed these concept notes for the benefit of Grade 9 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 9 Biology for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 9 Biology given our website

The Fundamental Unit Of Life Class 9 Biology Revision Notes

Class 9 Biology students should refer to the following concepts and notes for The Fundamental Unit Of Life in standard 9. These exam notes for Grade 9 Biology will be very useful for upcoming class tests and examinations and help you to score good marks

The Fundamental Unit Of Life Notes Class 9 Biology



Q1. Things to remember:

(a) New cells are formed from pre-existing cells.

(b) Movement of water molecules from their higher concentration to their lower concentration through a semi- permeable membrane is called Osmosis.

(c) The functional components of cell are plasma membrane, cytoplasm & nucleus.

(d) Protoplasm has two parts- cytoplasm & nucleoplasm.

(e) Nucleus, mitochondria & plastids have their own DNA & ribosomes.

(f) The shrinkage or contraction of the contents of the cell away from the cell wall is known as plasmolysis.

(g) The process by which Amoeba can engulf a food particle is endocytosis.

(h) Biogenesis is the manufacture of lipids required for making cell membrane.

(i) A cell that lacks nuclear membrane is called a prokaryotic cell & the nuclear region is called nucleoid.

(j) Movement of materials in & out of the cell takes place by diffusion & osmosis.

Q2. What is the advantage of multicellularity over unicellularity?

Ans- Division of labour.

Q3. What are the chromosomes made up of?

Ans- DNA & proteins

Q4. A cell placed in a solution swells up. What kind of solution is it? Why does it happen?

Ans- It is a hypotonic sol ution & water enters the cell by endosmosis causing the cell to swell up.

Q5. Why are lysosomes known as “suicidal bags”?

Ans- They secrete powerful digestive enzymes to digest the worn out and damaged cell organelles as well as the cell itself when it loses its functional ability.

Q6.Why is the nucleus so significant in a cell?

Ans- Nucleus has the following important functions-

(i) It controls all cell activities

(ii) It contains hereditary material that transmits hereditary information from one generation to the next

(iii) It helps in cell division


Q8. Draw neat & labelled diagrams of the following:-

i)Typical plant cell

(ii) Typical animal cell

(iii) Prokaryotic cell


Q9. Give the major functions of the following cell organelles-

(a) Endoplasmic reticulum- RER- Synthesis of proteins as it has ribosomes attached to it SER- Synthesis of lipids required for making cell membrane

(b) Golgi apparatus- Storage & packaging of various products.

(c) Mitochondria- Production of ATP(Adenosine Triphosphate) which is a source of energy.

(d) Ribosomes- Protein synthesis

(e) Golgi Apparatus-Storage & packaging of various products.

(f) Lysosomes- Digestion of worn out & damaged organelles


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