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Class notes
Class notes SCIENCE LESSON NOTES - 2020
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---15July 20242023/2024
- Illustration−1: 
How many different ways did ancient Indian philosophers 
classify matter? 
A. 
2 
B. 
6 
C. 
7 
D. 
5 
Ans: 
(D) 
• Matter is made up of Particles 
 Now that we have defined matter let us ask ourselves the question – What 
is matter made up of? 
 All matter comprises of very small particles. 
 All matter can be broken up in a similar manner to get very small particles. 
 Hence we now conclude that all matter is made up of small particles. 
Illustration −2: 
Which of the ...
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leonardkinyua
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Class notes
Class notes SCIENCE LESSON NOTES - 2020
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---17July 20242023/2024
- 1.1.1 Binary systems 
The circuits in a computer's processor are made up of billions of transistors. A transistor is a tiny 
switch that is activated by the electronic signals it receives. The digits 1 and 0 used in binary 
reflect the on and off states of a transistor. 
1.1.2 Hexadecimal 
Why use hex? 
● Higher information density. (more information stored in fewer “digits” than binary. 
● Used to simplify how binary is represented. 
Therefore, It is much easier to write numbers as hex...
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leonardkinyua
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Class notes
Class notes SCIENCE LESSON NOTES - 2020
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---41July 20242023/2024
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leonardkinyua
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Class notes
Class notes SCIENCE LESSON NOTES - 2020
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---83July 20242023/2024
- Specific Objectives 
By the end of this topic, the learner should be able to: 
• Identify some of the reproductive systems 
• Describe physical changes during adolescence 
• Identify parts of the circulatory system 
• Describe the components of blood and their functions 
• Identify the types of blood vessels and their functions 
• Describe the structure of and functions of the heart 
• Explain fertilization, development of foetus and birth process 
• Identify the main excretory o...
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leonardkinyua