structure of atom 9th chemistry

Chapter 2 STRUCTURE OF THE ATOM – 9th Class Chemistry Notes

Q#1) What is atom? Write in short words about history of atoms? Answer: In 585 B.C, Ancient Greek philosopher Democritus suggested that matter is composed of tiny indivisible particles called atoms.The name ATOM was derived from the Latin word Atomos meaning indivisible. Daltons Atomic Theory : In 1808 John Dalton put forward his Atomic Theory. According to this theory …

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Chapter 1 FUNDAMENTALS OF CHEMISTRY – 9th Class Chemistry Notes

Question#1) Write a short note on history of chemistry? Answer:History of Chemistry: Chemistry derived its name from word alchemy, which is a European word derived from the Arabic word al-kimia. Alkemai is the old name of Egypt. The word alcheme, khame, kheme means black earth. It refers to the black soil crust of Egypt. When the …

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Chapter Number 18 Pharmacology – 10th Class Biology Notes

Question 1: Define Pharmacology, Pharmacy and Pharmacognosy? Answer: Pharmacology: Pharmacology is the combination of two Greek words. Pharmakon means drug and logy means to study or to discuss. Pharmacology is the study of drug composition, properties and medical applications.  OR  Pharmacology is the study of action of drug. Pharmacy: Pharmacy is the study of preparation and dispensing …

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Chapter Number 17 Biotechnology – 10th Class Biology Notes

Question 1: Define biotechnology and describe its importance. Also write a detailed note on modern biotechnology or genetic engineering? Describe the achievements of genetic engineering in medicine, agriculture and environment. Or what is biotechnology. Write a detailed note on scope and importance of biotechnology?     Answer: Definition of Biotechnology: Biotechnology is defined as the …

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Chapter Number 16 Man and His Environment – 10th Class Biology Notes

Question 1: Define the following terms? (1) Environment (2) Habitat (3) Ecology (4) Niche (5) Conservation. (6) Biomass. Answer: (1) Environment: The surrounding of an organism is called environment. Environment includes all the biotic and abiotic factors that influence an organism. (2) Habitat: The specific locality with a particular set of environment where an organism lives …

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Chapter Number 15 Inheritance – 10th Class Biology Notes

Q#1) Define the following. Inheritance.  2) Heridity 3)Variation 4) Genetics 5) Genes 6) Chromosome 7) Chromation 8) Genotype 9) Evolution 10) Allele.   Answer: 1) Inheritance: Characters that are transmitting from parents to offsprings are called inheritance. These characters are of two types’ (a) Heridity (b) Variation. Heridity : Characters in offsprings that resemble to parents are …

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Chapter Number 14 Reproduction – 10th Class Biology Notes

Question 1: What is Reproduction? What are different types of reproduction?   Answer: REPRODUCTION: Reproduction is defined as the production of individuals of the same species i.e. the next generation of species is called reproduction.   Types of reproduction: Reproduction is of two types.   1) A-Sexual Reproduction: The type of reproduction in which there is no fusion …

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Chapter Number 13 Support and Movement – 10th Class Biology Notes

Question 1: Define Support, movement and locomotion? Answer: Support: support means to stand erect. Movement: Movement” is a general term meaning the act of changing place or position by entire body or by its parts. Locomotion: Locomotion is the movement of an animal as a whole from one place to another.   Question 2: What is skeleton? What are …

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Chapter Number 12 Coordination and Control – 10th Class Biology Notes

Question 1: Explain what can happen if there is no coordination in the activities of organisms.   Coordination: the ability to use different parts of the body together smoothly and efficiently is called coordination.   Coordination and Control: The ability of an organism to keep the different body parts in an association; so that the functions …

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