"Men are born and remain free and equal in rights."
Welcome to your comprehensive study material for Chapter 1 of the NCERT Ganita Prakash textbook: Large Numbers Around Us. This guide is designed to help you master the concepts of large numbers, understand how they behave, and develop a strong spatial and logical sense of their scale.
Chemical Bonding
Periodic Classification of Elements
The ICSE Chemistry paper pattern consists of:
Section I: Compulsory short-answer questions covering the entire syllabus
Section II: Structured analytical questions with internal choices
Focus on:
Application-based questions
Assertion-reasoning
Diagram/data interpretation
Logical chemical analysis
Conceptual understanding rather than rote memorization (ICSE Portal)
The word Trigonometry comes from two Greek words:
Trigon → Triangle
Metron → Measurement
So, trigonometry literally means:
“Measurement of triangles.”
Trigonometry is a branch of mathematics that studies the relationship between:
Sides of triangles
Angles of triangles
Especially, it deals with right-angled triangles.
In ancient times, people needed methods to:
Measure heights of mountains
Find distances between places
Navigate ships in oceans
Observe stars and planets
Since direct measurement was often impossible, mathematicians developed trigonometry.
The development of trigonometry started thousands of years ago.
Important civilizations contributing to trigonometry:
India
Greece
Babylon
Egypt
Arab civilization
Indian mathematicians made major contributions.
Aryabhata
Brahmagupta
Bhaskara I
Bhaskara II
These mathematicians developed:
Sine tables
Astronomical calculations
Angle measurement systems
Molecules of Life (MD-CHM-2.1)
B.Sc. Zoology – RTU Hojai University
Comprehensive Study Material
Living organisms are made up of a large number of chemical substances that perform various structural, physiological, and biochemical functions necessary for life. These chemical substances are known as biomolecules or molecules of life. Biomolecules are organic compounds produced by living organisms and are essential for growth, metabolism, reproduction, energy production, and maintenance of cellular activities. They form the structural and functional basis of all living cells and tissues.
Entrepreneurship in non-mulberry sericulture refers to the establishment and management of silk-related economic activities involving Eri and Muga silkworms for income generation, employment creation, and industrial development. Non-mulberry sericulture is an important agro-based cottage industry in India, especially in Assam and North-East India, where Eri and Muga silk are traditionally produced. This industry combines agriculture, animal rearing, handicrafts, textile production, and trade, thereby providing sustainable livelihood opportunities to rural populations.
