9th Class Notes

Importance of Biodiversity

Biodiversity Biodiversity: The term “biodiversity” has been derived from ‘bio’ and ‘diversity’.  Biodiversity is a measure of the variety of organisms present in different ecosystems or earth surface. Flora: Diversity of plants in an ecosystem is called flora. Fauna: Diversity of animals in an ecosystem is called flora.

Chapter 8 Chemical Reactivity 9th Class Chemistry Notes

Chapter 8 Chemical Reactivity 9th Class Chemistry Question#1) Define metals? What are the different groups of metals? Answer: METALS Metals are the elements (except hydrogen) which are electropositive and form cations by losing electrons.   Classification of Metals: Metals can be categorized. Very reactive:potassium, sodium, calcium, magnesium and aluminium. Moderately reactive :zinc, iron, tin and …

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STRUCTURE OF MOLECULE 9th Class Chemistry Chapter 4

Chapter#4   STRUCTURE OF MOLECULE 9th Class   Question#1) Define atom? Why do atoms forms chemical bond (Formation of Molecule)? Atom: Smallest entity of an element that show all the properties of that element and can enter into a chemical reaction is called atom. WHY DO ATOMS FORM CHEMICAL BONDS? 0R WHY DO ATOMS REACT? Answer: Atoms …

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Chapter 10 Gaseous Exchanges – 10th Class Biology Notes

Chapter 10 Gaseous Exchanges – 10th Class Biology Notes Question 1: Define gaseous exchanges, breathing and cellular respiration? Answer: Gaseous exchanges: Taking in oxygen and giving out of carbon dioxide is termed as gaseous exchange.  “OR” The exchange of gases in body of living organisms through a characteristic way is called gaseous exchanges. Gaseous exchanges is …

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Chapter 9 Transport – 9th Class Biology Notes

Chapter 9 Transport – 9th Class Biology Free And Easy Notes Question#1): What is the primary function of transport system? Answer:The primary function of transport system is to maintain a link between all cells of the body and the external environment. It transports the nutrients and water to the points where they are to be …

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Chapter 8 Nutrition – 9th Class Biology Notes

Chapter 8 Nutrition – 9th Class Biology Notes Question#1) Define the following terms? I) Nutrition. II) Nutrients. III) Autotrophs.  IV) Heterotrophs. Answer: I) Nutrition: The process in which food is obtained or prepared, absorbed and converted into body substances for growth and energy, is called nutrition. II) Nutrients: Nutrients are the elements and compounds that …

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