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5. The Fundamental Unit of Life Class 9 Science Solutions English Medium-Text-book Questions
5. The Fundamental Unit of Life Class 9 Science Solutions English Medium-Text-book Questions Get chapter-wise detailed explanations, step-by-step answers, important questions and exam-ready study material in Hindi and English medium.
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5. The Fundamental Unit of Life Class 9 Science Solutions English Medium-Text-book Questions
NCERT Solutions for Class 9 are specially prepared according to the latest CBSE syllabus (2026-27) to help students understand every concept clearly. These solutions provide step-by-step explanations, accurate answers, and exam-oriented guidance for all chapters. Class 9 students can improve their problem-solving skills, strengthen conceptual understanding, and prepare confidently for school as well as board examinations. All questions are solved in a simple and easy-to-understand language for both Hindi and English medium learners.
5. The Fundamental Unit of Life Class 9 Science Solutions English Medium-Text-book Questions
NCERT Solutions Class 9 Science English Medium
5. The Fundamental Unit of Life
Topic: Text-book Questions
Textual Questions With solution
Page No: 59
Q1. Who discovered cells and how?
Solution:
An English Botanist, Robert Hooke discovered cells. In 1665, he used self-designed microscope to observe cells in a cork slice.
Q2. Why is the cell called the structural and functional unit of life?
Solution:
Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells.
Page No: 61
Q1. How do substances like CO2 and water move in and out of the cell? Discuss.
Solution:
The substances like CO2and water move in and out of a cell by diffusion from the region of high concentration to low concentration. When the concentration of CO2and water is higher in external environment than that inside the cell, CO2and water moves inside the cell. When the concentration outside the cell becomes low and it is high inside the cell, they moves out.
Q2. Why is the plasma membrane called a selectively permeable membrane?
Solution:
Plasma membrane called a selectively permeable membrane because it regulates the movement of substances in and out of the cell. This means that the plasma membrane allows the entry of only some substances and prevents the movement of some other materials.
Page No: 63
1. 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 | 1. | Size: generally large (5-100 µm) |
| 2. | Nuclear region: ______________ and is known as ________. | 2. | Nuclear region: well-defined and surrounded by a nuclear membrane |
| 3. | Chromosome: single | 3. | More than one chromosome |
| 4. | Membrane-bound cell organelles are absent | 4. | -------- ------ ------- ------- -------- ------ |
Solution:
| Prokaryotic cell | Eukaryotic cell | ||
| 1. | Size : generally small (1-10 µm) 1 µm = 10-6 m | 1. | Size: generally large (5-100 µm) |
| 2. | Nuclear region : poorly defined because of the absence of a nuclear membrane and is known as nucleoid. | 2. | Nuclear region: well-defined and surrounded by a nuclear membrane |
| 3. | Chromosome: single | 3. | More than one chromosome |
| 4. | Membrane-bound cell organelles are absent | 4. | Membrane-bound cell organelles such as mitochondria, plastids, etc., are present |
Page No: 65
Q1. Can you name the two organelles we have studied that contain their own genetic material?
Solution:
Mitochondria and plastids
Q2. If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
Solution:
If the organisation of a cell is destroyed due to some physical or chemical influence then cell will not be able to perform the basic functions like respiration, nutrition, excretion etc. This may stop all the life activities and may result in its death.
Q3. Why are lysosomes known as suicide bags?
Solution:
Lysosomes are called suicide bags because in case of disturbance of their cellular metabolism they digest their own cell by releasing own enzymes.
Q4. Where are proteins synthesized inside the cell?
Solution:
The proteins are synthesized in the Ribosome inside the cell.
Page No: 66
Exercise
Q1. Make a comparison and write down ways in which plant cells are different from animal cells.
Solution:
| Animal cell | Plant cell |
| 1. The do not have cell wall. | 1. They have cell wall made up of cellulose. |
| 2. They do not have chloroplast. | 2. They contain chloroplast. |
| 3. They have centrosome. | 3. They do not have centrosome. |
| 4. Vacuoles are smaller in size. | 4. Vacuoles are larger in size. |
| 5. Lysosomes are larger in number. | 5. Lysosomes are absent or very few in number |
| 6. Prominent Golgi bodies are present. | 6. Subunits of Golgi bodies known as dictyosomes are present. |
Q2. How is a prokaryotic cell different from a eukaryotic cell?
Solution:
|
Prokaryotic cell |
Eukaryotic cell |
|
1. Most prokaryotes are unicellular. |
1. Most eukaryotes are multicellular. |
|
2. Size of the cell is generally small (0.5- 5 µm). |
2. Size of the cell is generally large (50- 100 µm). |
|
3. Nuclear region is poorly defined due to the absence of a nuclear membrane or the cell lacks true nucleus. |
3. Nuclear region is well-defined and is surrounded by a nuclear membrane, or true nucleus bound by a nuclear membrane is present in the cell. |
|
4. It contains a single chromosome. |
4. It contains more than one chromosome. |
|
5. Nucleolus is absent. |
5. Nucleolus is present. |
|
6. Membrane-bound cell organelles such as plastids, mitochondria, endoplasmic reticulum, Golgi apparatus, etc. are absent. |
6. Cell organelles such as mitochondria, plastids, endoplasmic reticulum, Golgi apparatus, lysosomes, etc. are present. |
|
7. Cell division occurs through binary fission |
7. Cell division occurs by mitosis. |
|
8. Prokaryotic cells are found in bacteria and blue-green algae. |
8. Eukaryotic cells are found in fungi, plants, and animal cells. |
Q3. What would happen if the plasma membrane ruptures or breaks down?
Solution:
If the plasma membrane ruptures or breakdown then the cell will not be able to exchange material from its surrounding by diffusion or osmosis. Thereafter the protoplasmic material will be disappeared and the cell will die.
Page No: 67
4. What would happen to the life of a cell if there was no Golgi apparatus?
Solution:
Golgi apparatus has the function of storage modification and packaging of the products. If there is no Golgi apparatus then the packaging and transporting of materials synthesized by cell will not happen.
5. Which organelle is known as the powerhouse of the cell? Why?
Solution:
Mitochondria are known as the powerhouse of cells because energy required for various chemical activities needed for life is released by mitochondria in the form of ATP (Adenosine triphosphate) molecules.
6. Where do the lipids and proteins constituting the cell membrane get synthesized?
Solution:
Lipids are synthesized in Smooth endoplasmic reticulum (SER) and the proteins are synthesized in rough endoplasmic reticulum (RER).
7. How does an Amoeba obtain its food?
Solution:
Amoeba takes in food using temporary finger-like extensions of the cell surface which fuse over the food particle forming a food-vacuole as shown in figure. Inside the food vacuole, complex substances are broken down into simpler ones which then diffuse into the cytoplasm. The remaining undigested material is moved to the surface of the cell and thrown out.
8. What is osmosis?
Solution:
Osmosis is the process in which water molecules moves from the region of high concentration to a region of low concentration through a semi permeable membrane
All Topics From 5. The Fundamental Unit of Life
See other sub-topics of this chapter:
1. Chapter Review 2. Text-book Questions 3. Additional -Questions 4. Additional -Questions 2 5. AssignmentNCERT Solutions Class 9 Hindi and English Medium – Complete Study Material
NCERT Solutions Class 9 students ke liye specially CBSE latest syllabus (2026-27) ke according prepare kiye gaye hain. Yeh solutions Hindi aur English medium dono ke liye available hain, jisse har student apni language preference ke hisaab se padh sakta hai. Har chapter ke sabhi prashnon ke step-by-step answers diye gaye hain jo concept clarity aur exam preparation me madad karte hain.
Chapter-Wise Detailed Explanations
Class 9 ke liye diye gaye Chapter Wise NCERT Solutions me har question ka detailed aur easy explanation diya gaya hai. Chahe aap CBSE Board Exam Preparation kar rahe ho ya school test ke liye revise kar rahe ho, yeh solutions aapko complete understanding denge. Har answer simple language me likha gaya hai jisse students concepts ko easily grasp kar saken.
Hindi and English Medium Support
Students Hindi aur English medium dono me NCERT Book Solutions Class 9 access kar sakte hain. Yeh dual language support un students ke liye helpful hai jo apni regional language me better samajhna chahte hain. Sabhi answers CBSE Latest Syllabus 2026-27 ke anusaar update kiye gaye hain.
Important Features of NCERT Solutions
- Class 9 NCERT Solutions PDF
- CBSE Class 9 Study Material
- NCERT Book Questions and Answers
- Exam Oriented Important Questions
- Step-by-Step Detailed Solutions
- Concept Clarity and Revision Notes
Why Students Should Use NCERT Solutions?
Aaj ke competitive environment me sirf textbook padhna kaafi nahi hota. NCERT Solutions for Class 9 students ko practice aur conceptual understanding dono provide karte hain. Yeh solutions unhe exam pattern samajhne, frequently asked questions practice karne aur high score achieve karne me madad karte hain. Regular practice se students apne weak topics ko improve kar sakte hain.
Best Resource for Exam Preparation
Agar aap Class 9 CBSE Preparation ke liye ek trusted aur reliable source dhundh rahe hain, to yeh NCERT Solutions perfect choice hain. Yeh study material school exams, unit tests, half-yearly aur annual exams ke liye equally useful hai. Har chapter ke answers accurate, verified aur student-friendly format me diye gaye hain.
Isliye agar aap NCERT Solutions Class 9 Hindi and English Medium search kar rahe hain, to yahan aapko complete chapter-wise solutions milenge jo aapki academic journey ko strong aur confident banayenge.