Chapter 11   Homeostasis – 10th Class Biology Notes

Question 1: What is homeostasis? What are the different types of homeostasis? Answer: HOMEOSTASIS Homeostasis is the combination of two Greek words, Homoios means similar and stasis means standing still. The maintenance of the internal conditions of body at equilibrium, despite changes in the external environment is called homeostasis. “OR” The ability of a living organism …

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Chapter 10 Gaseous Exchanges – 10th Class Biology Notes

Gaseous Exchanges   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 the diffusion of gases from a …

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Chapter 9 Transport – 9th Class Biology Free And Easy Notes

Chapter#9                   TRANSPORT       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 used.   Question#2) Descibe the importance of …

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Chapter 8 Nutrition – 9th Class Biology Notes

Chapter#8                     NUTRITION     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 an organism obtains and uses …

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Chapter 6 Enzymes – 9th Class Biology Notes

Chapter#6                                             Enzymes              Question#1) Write a short note on enzyme? Answer: Enzyme: Enzymes are proteins that catalyze (speed up) biochemical reactions by lowering its activation energy and are not changed during the reaction. All enzymes are catalysts but all catalysts are not enzymes. Only biocatalysts are called enzymes. Word enzyme was first used by a German …

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Chapter 5 Cell Cycle – 9th Class Biology Notes

Chapter#5                 CELL CYCLE Interesting information about this chapter and introduction;- All organisms consists of cells. An adult human being has approximately 1, 00,000 billion cells, all originate from a single cell, the fertilized egg cell or zygote. Cells arise from free existing cells as a result of cell division (cell reproduction) . Cells reproduce to …

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Chapter 4 Cells and Tissues – 9th Class Biology Notes

Chapter # 4                                  CELLS AND TISSUES Question#1) Define Microscopy? What are different types of Microscope?   Answer:- Microscope; An optical instrument used for viewing very small objects, such as mineral samples or animal or plant cells, typically magnified several hundred times.   Microscopy:- Microscopy is the use of microscope to observe minute living organisms.

Chapter 3 Biodiversity – 9th Class Biology Notes

Chapter # 3                        BIODIVERSITY     Question#1) Define Biodiversity? Answer: 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 …

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