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Q1 Who discovered cells, and how?
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Q2 Why is the cell called the structural and functional unit of life?
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Chapter 5 The Fundamental Unit of Life
As the name of the chapter justify the cell is fundamental unit of life. As a house is made of thousand and million af brick similarly all organisms are made as these cell which perform all vital functions for our body. Together they form tissue then organ and organ system then a complete body cells have capability to divide and again form new cell to maintain continuity.
Download pdf of NCERT Solutions for Class Science Chapter 5 The Fundamental Unit of Life
Exercise 1
Exercise 2
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Q1 How do substances like CO2 and water move in and out of the cell? Discuss.
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Q2 Why is the plasma membrane called a selectively permeable membrane?
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Exercise 3
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Q1 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 m1. Size generally large (5-100 μm) 2. Nuclear region: ________________
and known as _________________2. Nuclear region: well defined
andsurrounded by a nuclear
membrane3. Chromosome: single
3. More than one chromosome 4. Membrane-bound cell organelles absent 4. _______________________
_______________________Ans: Our experts will give the answer soon.
Exercise 4
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Q1 Can you name the two organelles we have studied that contain their own genetic material?
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Q2 If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?
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Q3 Why are lysosomes known as suicide bags?
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Q4 Where are proteins synthesised inside the cell?
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Exercise 5
Popular Questions of Class 9 Science
- Q:-
Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide. - Q:-
Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
- Q:-
Why is the atmosphere essential for life?
- Q:-
Why is the weight of an object on the moon 1/6th its weight on the earth?
- Q:-
What happens to the force between two objects, if
(i) the mass of one object is doubled?
(ii) the distance between the objects is doubled and tripled?
(iii) the masses of both objects are doubled? - Q:-
Why are we normally advised to take bland and nourishing food when we are sick?
- Q:-
You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?
- Q:-
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
- Q:-
Abdul, while driving to school, computes the average speed for his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and the average speed is 40 km h-1. What is the average speed for Abdul’s trip?
- Q:-
Explain the working and application of a sonar.
Recently Viewed Questions of Class 9 Science
- Q:-
What type of clothes should we wear in summer?
- Q:-
Abdul, while driving to school, computes the average speed for his trip to be 20 km h-1. On his return trip along the same route, there is less traffic and the average speed is 40 km h-1. What is the average speed for Abdul’s trip?
- Q:-
Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
- Q:-
You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
- Q:-
Why is the weight of an object on the moon 1/6th its weight on the earth?
- Q:-
A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
- Q:-
How are sol, solution and suspension different from each other?
- Q:-
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s-1?
- Q:-
What do you mean by buoyancy?
- Q:-
Compare the use of manure and fertilizers in maintaining soil fertility.
- NCERT Chapter
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