The human ear can easily detect frequencies between 20 Hz and 20 kHz. Hence, sound waves with frequency ranging from 20 Hz to 20 kHz is known as audible sound. Human ears cannot detect sound frequencies of less than 20 …
The frictional force exerted by fluids is also called drag or fluid friction. To overcome or minimize air fluid friction, the bodies of objects minimise their surface i.e. sometimes spherical shapes or another streamlined shape with smooth surfaces. Aeroplanes, jets, …
In Chapter 7, Force and Pressure, students will come across questions on applied force and changes in the object’s shape. Some questions, like the difference between force and pressure, appear prominently in the exams, which are explained in detail in …
The period which comes between the beginning of adulthood and puberty is called adolescence. In this period, the body undergoes different changes alongside attaining reproductive maturity. It starts somewhat at the age of 11 and ends at the age of …
Reproduction is termed to be a biological process in which organisms give birth to their offspring.It helps in maintaining the continuity of a particular race and in increasing the population of the species.Reproduction is meant for the survival of all …
The number and variety of various life forms, such as plants, animals and microorganisms, in an area are called Biodiversity. Both plants and animals have a mutual dependence on each other for their survival. As they are related to one …
1. List conditions under which combustion can take place. Solution: The burning of a substance in the presence of oxygen is defined as combustion. The conditions under which combustion can take place are 2. Fill in the blanks. (a) Burning …
After studying this chapter’s NCERT Solutions for Class 8 Science, students will be able to gather knowledge on microorganisms, their habitats, classes of microorganisms like bacteria, fungi, protozoans and viruses, mode of their reproduction, use of microorganisms, harmful microorganisms, pathogens, soil microorganisms, …
NCERT Solutions for Class 8 Science Chapter 1 Crop Production and Management guides you with the answers to the questions given in the textbook. Class 8 is an important phase in the student’s life as they are introduced to many new …
The Class 7 Chapter 12 Science Forest: Our Lifeline Is about the condition of the forest lands in our country. It brings out the importance of forests in our lives, and it also depicts the effects of forest depletion on …
Important points that you should remember about the chapter 1. Fill in the blanks: a. An image that cannot be obtained on a screen is called ———-. Ans: Virtual image. b. The image formed by a concave ———- is always …
1. Draw in your notebook the symbols to represent the following components of electrical circuits: Connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery. Solution: 2. Draw the circuit diagram to represent the …
1. Classify the following as motion along a straight line, circular or oscillatory motion: (i) Motion of your hands while running. (ii) Motion of a horse pulling a cart on a straight road. (iii) Motion of a child in a …
Exercise Questions1. Fill in the blanks:(a) Production of new individuals from the vegetative part of the parent is called_____________.(b) A flower may have either male or female reproductive parts. Such a flower is called_____________.(c) The transfer of pollen grains from …
Circulatory System We all know that blood flows out whenever we get a cut. Blood is defined as the fluid that flows through the blood vessels. It transports oxygen from the lungs to various parts of the body. It also …
NCERT Grade 7 Science, Chapter 6, Respiration in Organisms is all about respiration, the reasons behind respiration, and a few different concepts related to respiration. The first component discusses the motives at the back of breathing. Under this, terms like …