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CBSE worksheets for Microorganisms: Friend and Foe worksheet for class 8 in PDF for free download. Science worksheets for class 8 CBSE includes worksheets on Microorganisms: Friend and Foe as per NCERT syllabus. CBSE class 8 worksheets as PDF for free download Microorganisms: Friend and Foe worksheets. Users can download and print the worksheets on class 8 Science Microorganisms: Friend and Foe for free.

Download Microorganisms: Friend and Foe worksheet for class 8

Microorganisms: Friend and Foe worksheet for class 8 Important Topics

Microorganisms
Where do Microorganisms Live?
Microorganisms and Us
Harmful Microorganisms
Food Preservation
Nitrogen Fixation
Nitrogen cycle

Some important Facts about Microorganisms: Friend and Foe worksheet for class 8

Pull out a gram or bean plant from the field. Observe its roots. You will find round structures called root nodules on the roots. Draw a diagram of the root and show the root nodules.
Collect the labels from the bottles of jams and jellies. Write down the list of contents printed on the labels.
Visit a doctor. Find out why antibiotics should not be overused. Prepare a short report.
Project : Requirements – 2 test tubes, marker pen, sugar, yeast powder, 2 balloons and lime water. Take two test tubes and mark them A and B. Clamp these tubes in a stand and fill them with water leaving some space at the top. Put two spoonfuls of sugar in each of the test tubes. Add a spoonful of yeast in test tube B. Inflate the two balloons incompletely. Now tie the balloons on the mouths of each test tube. Keep them in a warm place, away from sunlight. Watch the setup every day for next 3-4 days. Record your observations and think of an explanation.

NCERT Class 8 Science Solved Worksheets

Chapter 1 – Crop Production and Management
Chapter 2 – Microorganisms : Friend and Foe
Chapter 3 – Synthetic Fibres and Plastics
Chapter 4 – Materials : Metals and Non-Metals
Chapter 5 – Coal and Petroleum
Chapter 6 – Combustion and Flame
Chapter 7 – Conservation of Plants and Animals
Chapter 8 – Cell – Structure and Functions
Chapter 9 – Reproduction in Animals
Chapter 10 – Reaching The Age of Adolescence
Chapter 11 – Force and Pressure
Chapter 12 – Friction
Chapter 13 – Sound
Chapter 14 – Chemical Effects of Electric Current
Chapter 15 – Some Natural Phenomena
Chapter 16 – Light
Chapter 17 – Stars and The Solar System
Chapter 18 – Pollution of Air and Water

CBSE Worksheets for Class 8 Science in PDF

Nitrogen cycle

Our atmosphere has 78% nitrogen gas. Nitrogen is one of the essential constituents of all living organisms as part of proteins, chlorophyll, nucleic acids and vitamins. The atmospheric nitrogen cannot be taken directly by plants and animals. Certain bacteria and blue green algae present in the soil fix nitrogen from the atmosphere and convert it into compounds of nitrogen. Once nitrogen is converted into these usable compounds, it can be utilised by plants from the soil through their root system. Nitrogen is then used for the synthesis of plant proteins and other compounds. Animals feeding on plants get these proteins and other nitrogen compounds

When plants and animals die, bacteria and fungi present in the soil convert the nitrogenous wastes into nitrogenous compounds to be used by plants again. Certain other bacteria convert some part of them to nitrogen gas which goes back into the atmosphere. As a result, the percentage of nitrogen in the atmosphere remains more or less constant.

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