Exercise Questions Question 1. Indicate whether the following statements are True (T) or False (F). (a) Unicellular organisms have a one-celled body. (T/F) (b) Muscle cells are branched. (T/F) (c) The basic living unit of an organism is an organ. (T/F) (d) Amoeba has irregular shape. (T/F) Solution 1. a) Unicellular organisms have one-celled bodies. […]
CLASS 8 Chapter 8 Cell- Structure and Functions Read More »
Exercise Questions Question 1. Fill in the blanks. (a) A place where animals are protected in their natural habitat is called _________. (b) Species found only in a particular area is known as _______. (c) Migratory birds fly to faraway places because of __________ changes. Solution 1. (a) A place where animals are protected in
CLASS 8 Chapter 7 Conservation of Plants and Animals Read More »
Question 1: Fill in the blanks: (a) Microorganisms can be seen with the help of a ____________. (b) Blue-green algae fix __________ directly from the air to enhance the fertility of the soil. (c) Alcohol is produced with the help of __________. (d) Cholera is caused by __________. Answer: (a) Microorganisms can be seen with
CLASS 8 Chapter 2 Microorganisms : Friend and Foe Read More »
Question 1. Select the correct word from the following list and fill in the blanks. float, water, crop, nutrients, preparation (a) The same kind of plants grown and cultivated on a large scale at a place is called _____________. (b) The first step before growing crops is _____________ of the soil. (c) Damaged seeds would _____________
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Introduction Our environment used to be very pure where fresh air and clean water were available. Now the quality of is environment is falling down which affects our lives. People suffering because of many waterborne diseases and poor air quality. Water and air are of great importance in human lives in many ways but the
Class 8 Chapter 18 Pollution of Air and Water Read More »
Introduction Human beings can reproduce only after a certain age because their reproductive system becomes active after a certain age. The hormonal changes are responsible for transforming a child into an adult. The period of life, when the body undergoes several changes which lead to reproductive maturity, is called adolescence. Adolescence begins at the age
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Reproduction The phenomenon of producing young ones from an existing living organism of the same species is called Reproduction. It is essential for the continuation of a species. Living organisms produce more organisms of their kind to maintain the life of their species on this earth. Reproduction gives rise to more organisms with similar basic
Class 8 Chapter 9 Reproduction in Animals Read More »
Introduction Cells are the major structural unit of an organ. Just as bricks are arranged together to make a building, similarly cell is arranged to make body of every organism. In 1665 Robert Hooke observed slices of cork under a magnifying instrument. Cork is a part of the bark of a tree. He detected compartments
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Introduction They are living organisms of very small size. They are so small that they cannot be seen by the naked eye. We would require a microscope or magnifying glass to see them. Example: Bacteria, Fungi There are four major groups: Bacteria Fungi Protozoa Algae Viruses are also microscopic but are quite different from other
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Introduction To provide food for a large population regular crop production, proper management and distribution are required. When the same type of plant is grown in one place on a large scale, it is called a crop. Depending on the seasons in India, there are two primary types of crops: Kharif Crops: The crops which
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