These fibers Divide the following properties into the properties of natural fibers and synthetic fibers.
These fibers are shiny and easily washable.
These fibers are made from chemical substance.
• These fibers are made from wool, jute etc.
Polyster is made from these fibers.
These fibers are strong and light. These fibers are relatively less strong.
Vegetable material is used to make these fibers.
These fibers are not harmful to the environment.
(B) Classify the below given properties for unicellular organisms and multicellular organisms.
. Its body is made up of more than one cell.
• It has an organ or organ system.
It does not contain tissue.
• Fish is an example of this.
Euglena is an example of this.
Its body is made up of a single cell.
Explain the difference on the basis of properties
(1) Thermosetting plastics and thermoplastics.
(2) Physical properties of metals and non metal physical properties.
(3) Useful micro organisms and harmful micro organisms.
Q-3 Do as directed
(1) How do microorganisms increase soil fertility
?
(2) Which activity would you do to prove that the temperature of a substance must reach the combustion point of that substance in order to ignite it?
(3) How is petroleum made up ?
(4) Collect information and make a note on how food is preserved in your home.
(5) Make a note on which microorganisms are used in your home to make different dishes?
Q-4 Answer correctly.
(1) How does the vaccine help to prevent disease?
(2) Why do birds migrate?
(3) Which irrigation system is useful in water scarcity area ? Why ?
Q-5 State the microorganisms responsible for the following diseases and their mode of
transmission.
(1) Cholera
Q-6 Do as directed.
(1) Explain - Threshing
(2) Malaria
(2) Which part of the flame does goldsmith use to make jewellery ? Why ? (3) Why is phosphorus kept in water?
(4) How is sex determined of a foetus?
Answers
Answered by
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Answer:
YOU DON'T KNOW ABOUT SEX
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