Search results
Download the PDF of Science Book Class 9 from the National Council of Educational Research and Training (NCERT) website. The book covers 16 chapters of science topics for class 9 students.
Download NCERT textbooks of all subjects for classes I to XII in Hindi, English and Urdu. Note the copyright terms and the rationalised textbooks for 2022-23 and 2023-24.
Lift a book through a height. To do this you must apply a force. The book rises up. There is a force applied on the book and the book has moved. Hence, work is done. A closer look at the above situations reveals that two conditions need to be satisfied for work to be done: (i) a force should act on an object, and (ii) the object must be displaced.
Learn about the concepts of health and disease, and how they are influenced by various factors such as environment, society, and genetics. Explore the causes and examples of different types of diseases, and how they affect our body functions.
Pastoralists in the Modern World 101 Activity Source B In Karnataka and Andhra Pradesh, again, the dry central plateau was covered with stone and grass, inhabited by cattle, goat and sheep
1/10 9 m = 1 nm 1 m = 109 nm Relative Sizes Radii (in m) Example 10–10 Atom of hydrogen 10–9 Molecule of water 10–8 Molecule of haemoglobin 10–4 Grain of sand 10–2 Ant 10–1 Watermelon Fig. 3.2: An image of the surface of silicon 3.2.1 WHAT ARE THE MODERN DAY SYMBOLS OF ATOMS OF DIFFERENT ELEMENTS? Dalton was the first scientist to use the symbols for elements in a very specific sense.
This chapter discusses the causes, trends and consequences of poverty in India, using examples and social indicators. It also explains the concepts of social exclusion and vulnerability, and the challenges of human poverty.
Learn how to increase crop yields by improving crop varieties, production and protection. Find out the factors, methods and benefits of crop improvement for food security and sustainability.
Class Order Family Genus Species Thus, by separating organisms on the basis of a hierarchy of characteristics into smaller and smaller groups, we arrive at the basic unit of classification, which is a ‘species’. So what organisms can be said to belong to the same species? Broadly, a species includes all organisms that are similar
In this book, we will consider only quadrilaterals of the type given in Fig. 8.1 (iii) but not as given in Fig. 8.1 (iv). A quadrilateral has four sides, four angles and four vertices [see Fig. 8.2 (i)].
