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NCERT solutions for Class 9 Science chapter 5 - The Fundamental Unit of Life

Science Textbook for Class 9

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NCERT Science Class 9

Science Textbook for Class 9

Chapter 5 - The Fundamental Unit of Life

Page 59

Q 1 | Page 59

Who discovered cells and how?

Q 2 | Page 59

Why is the cell called the structural and functional unit of life?

Page 60

Q 1 | Page 60

How do substances like CO2 and water move in and out of the cell? Discuss.

Q 2 | Page 60

Why is the plasma membrane called a selectively permeable membrane?

Page 63

Q 1 | Page 63

Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.

  Prokaryotic cell Eukaryotic cell
1. Size: generally small ( 1-10 µm) 1 µm = 10-6 m Size: generally large (5-100 µm)
2. Nuclear region: ______________and is known as____ Nuclear region: well-defined and surrounded by a nuclear membrane
3. Chromosome: single More than one chromosome
4. Membrane-bound cell organelles are absent  _______________________________

Page 65

Q 1 | Page 65

Can you name the two organelles we have studied that contain their own genetic material?

Q 2 | Page 65

If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?

Q 3 | Page 65

Why are lysosomes known as suicide bags?

Q 4 | Page 65

Where are proteins synthesized inside the cell?

Pages 66 - 67

Q 1 | Page 66

Make a comparison and write down ways in which plant cells are different from animal cells.

Q 2 | Page 66

How is a prokaryotic cell different from a eukaryotic cell?

Q 3 | Page 66

What would happen if the plasma membrane ruptures or breaks down?

Q 4 | Page 67

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

Q 5 | Page 67

Which organelle is known as the powerhouse of the cell? Why?

Q 6 | Page 67

Where do the lipids and proteins constituting the cell membrane get synthesized?

Q 7 | Page 67

How does an Amoeba obtain its food?

Q 8 | Page 67

What is osmosis?

Q 9 | Page 67

Carry out the following osmosis experiment:

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,

(a) Keep cup A empty

(b) Put one teaspoon sugar in cup B

(c) Put one teaspoon salt in cup C

(d) Put one teaspoon sugar in the boiled potato cup D.

Keep these for two hours. Then observe the four potato cups and answer the following:

(i) Explain why water gathers in the hollowed portion of B and C.

(ii) Why is potato A necessary for this experiment?

(iii) Explain why water does not gather in the hollowed out portions of A and D.

NCERT Science Class 9

Science Textbook for Class 9

NCERT solutions for Class 9 Science chapter 5 - The Fundamental Unit of Life

NCERT solutions for Class 9 Science chapter 5 (The Fundamental Unit of Life) include all questions with solution and detail explanation from Science Textbook for Class 9. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. has created the CBSE Science Textbook for Class 9 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at are providing such solutions so that students can prepare for written exams. These NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 Science chapter 5 The Fundamental Unit of Life are Cell Organelles - Plastids, Cell Organelles - Vacuoles, Cell Organelles - Mitochondria, Cell Organelles - Lysosomes, Cell Organelles - Golgi Apparatus, Cell Organelles - Endoplasmic Reticulum (ER), Cell Organelles and Cell Inclusions, Cytoplasm, Nucleus, Cell Wall, Plasma Membrane Or Cell Membrane, Difference Between Prokaryotic and Eukaryotic Cell, Prokaryotic Cell and Eukaryotic Cell, Concept of Cell, Concept of Living Organisms.

Using NCERT solutions for Class 9 Science by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 9 prefer NCERT Textbook Solutions to score more in exam.

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