<p><span style="background-color:transparent; color:rgb(0, 0, 0); font-family:arial; font-size:11pt">Who discovered cells, and how?</span></p>

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Who discovered cells, and how? | Class 9 Science Chapter The Fundamental Unit of Life, The Fundamental Unit of Life NCERT Solutions

Welcome to the NCERT Solutions for Class 9 Science - Chapter The Fundamental Unit of Life. This page offers a step-by-step solution to the specific question from Exercise 1, Question 1: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 1:

Who discovered cells, and how?

Answer:

Robert Hooke found cells in 1665 while analyzing a flimsy cut of stopper through a self-planned magnifying lens. He saw that the plug looked like the design of a honeycomb consisting of numerous little compartments. These little boxes are called cells.

Other Questions of Chapter The Fundamental Unit of Life

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

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

Draw a neat labelled diagram of an animal cell.

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

Why are lysosomes known as suicide bags?

Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?

Why does the skin of your finger shrink when you wash clothes for a long time?

Draw a plant cell and label the parts which
(a) determines the function and development of the cell.
(b) packages materials coming from the endoplasmic reticulum.
(c) provides resistance to microbes to withstand hypotonic external media without bursting.
(d) is site for many biochemical reactions necessary to sustain life.
(e) is a fluid contained inside the nucleus.

What is osmosis?

How is a bacterial cell different from an onion peel cell?

Popular questions of class 9 Science

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?

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.

A driver of a car travelling at 52 km h^-1 applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. Another driver going at 3 km h^-1 in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied?

Fig 8.11 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:

Fig. 8.11

(a) Which of the three is travelling the fastest?
(b) Are all three ever at the same point on the road?
(c) How far has C travelled when B passes A?
(d) How far has B travelled by the time it passes C?

Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s^-1 before the collision during which they stick together. What will be the velocity of the combined object after collision?

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?

Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m s^-1 and 1 m s^-1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 m s^-1. Determine the velocity of the second object.

How do poriferan animals differ from coelenterate animals?

The speed-time graph for a car is shown is Fig. 8.12.

Fig. 8.12

(a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.
(b) Which part of the graph represents uniform motion of the car?

How are sol, solution and suspension different from each other?

Recently Viewed Questions of Class 9 Science

What is meant by the term chemical formula?

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

What are the two forms of oxygen found in the atmosphere?

What is the momentum of an object of mass m, moving with a velocity v?
(a) (mv)² (b) mv² (c) 1⁄2 mv² (d) mv

On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.

Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

The earth is acted upon by gravitation of Sun, even though it does not fall into the Sun. Why?

Explain how bats use ultrasound to catch a prey.

Why is it difficult to hold a school bag having a strap made of a thin and strong string?

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about The Fundamental Unit of Life.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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