# Which chapter is most important in science class 9?

## Which chapter is most important in science class 9?

Find below the chapter-wise links to access the Important Topics and Questions for Class 9 Science:

• Chapter 1: Matter in Our Surroundings.
• Chapter 2: Is matter arround us pure.
• Chapter 3: Atoms and Molecules.
• Chapter 4: Structure of Atom.
• Chapter 5: The fundamental unit of life.
• Chapter 6: Tissues.

Why do you fall ill class 9?

Immediate cause: This is due to the organisms that enter our body and cause disease. Example, virus, protozoa, bacteria. Contributory cause: These are the secondary factors which lead these organisms to enter our body. Example, dirty water, unclean surrounding, contaminated food etc.

How many chapters are there in class 9 science?

15 chapters
There are a total of 15 chapters included in the NCERT book for class 9 science.

### What is motion class 9 short answer?

(a) Motion: An object is said to be in motion when its position changes with time. We describe the location of an object by specifying a reference point. Motion is relative. The total path covered by an object is said to be the distance travelled by it.

What is matter in science class 9 Ncert?

Answer: Anything that occupies space and has mass is called matter.

Which is the toughest chapter in class 9 maths?

Step-by-step explanation: Some students find Geometry difficult whereas others may find the Surface area and Volume, Constructions or Statistics. But, in general, maximum students find Geometry as the most difficult topic. Also, under the Geometry section Triangles is the most disliked chapter of class IX maths.

## Is Class 9 biology tough?

Biology is really a difficult subject but very interesting when comprehended well and practice with easy to hard problems and students find it difficult because most of them do not have their basics clear for the subject.

What is free fall class 9th?

Answer. When a body or object falls towards earth due to gravitational force of earth and without any other force acting on it. It is called free. fall. The acceleration produced during free fall due to earth’s gravitational force is the acceleration of free fall.