Class 8 Exam > Class 8 Notes > Science Curiosity Class 8 - New NCERT > Worksheet-2: The Invisible Living World: Beyond Our Naked Eye
Worksheet-2: The Invisible Living World: Beyond Our Naked Eye | Science Curiosity Class 8 - New NCERT PDF Download
| Table of contents |
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| Multiple Choice Questions (MCQs) |
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| Fill in the Blanks |
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| True/False Questions |
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| Very Short Answer Questions |
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Multiple Choice Questions (MCQs)
Q1: Which of the following is not a use of microorganisms?
A) Making antibiotics
B) Fixing nitrogen in the soil
C) Increasing the spoilage of food
D) Producing alcohol
Q2: Which microorganism is used to make curd from milk?
A) Yeast
B) Lactobacillus
C) Penicillium
D) Rhizobium
Q3: What is the role of microorganisms in the nitrogen cycle?
A) They decompose organic matter releasing nitrogen gas into the atmosphere.
B) They convert atmospheric nitrogen into usable compounds for plants.
C) They increase the nitrogen content in the atmosphere.
D) They consume nitrogen from the soil.
Q4: How do friendly microorganisms benefit humans?
A) They cause diseases.
B) They help in digestion and nutrient absorption.
C) They spoil food.
D) They reduce soil fertility.
Fill in the Blanks
Q1: Microorganisms that are beneficial to humans and aid in digestion are called__________ microorganisms.
Q2: The process by which yeast helps to make bread is called ____________.
Q3: The technique discovered by Louis Pasteur to kill harmful microbes in milk is known as ___________.
Q4: Rhizobium bacteria are known for fixing nitrogen in the soil, which helps ____________ plants.
True/False Questions
Q1: Microorganisms can only be harmful and have no beneficial uses.
Q2: All bacteria are harmful to humans and other living organisms.
Q3: Preservation by sugar involves reducing the moisture content which inhibits bacterial growth.
Very Short Answer Questions
Q1: What are preservatives?
Q2: Name the microorganisms which can fix atmospheric nitrogen in the soil.
Q3: Give two examples of algae.
Q4: What are the harmful effects of microorganisms on plants?
Q5: How are jams and squashes preserved?
Q6: How can food be preserved by adding oil and vinegar?
You can access the solutions to this worksheet here.
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FAQs on Worksheet-2: The Invisible Living World: Beyond Our Naked Eye - Science Curiosity Class 8 - New NCERT
| 1. What is the invisible living world, and why is it important to study it? |  |
Ans. The invisible living world refers to microorganisms such as bacteria, viruses, fungi, and protozoa that cannot be seen with the naked eye. Studying this world is crucial because these organisms play significant roles in ecosystems, human health, and various industrial processes. They are involved in nutrient cycling, disease causation, and biotechnological applications.
| 2. How do microorganisms contribute to the ecosystem? | |
Ans. Microorganisms contribute to the ecosystem by decomposing organic matter, which recycles nutrients back into the soil, making them available for plants. They also facilitate processes like nitrogen fixation, which is essential for plant growth, and help maintain the balance of various biological processes in the environment.
| 3. What are some common diseases caused by microorganisms? | |
Ans. Some common diseases caused by microorganisms include tuberculosis (caused by Mycobacterium tuberculosis), influenza (caused by the influenza virus), and bacterial infections like strep throat (caused by Streptococcus bacteria). Understanding these microorganisms helps in developing vaccines and treatments.
| 4. What techniques are used to study microorganisms that are not visible to the naked eye? | |
Ans. Techniques such as microscopy (using microscopes), culturing (growing microorganisms in controlled environments), and molecular methods (like PCR and DNA sequencing) are used to study microorganisms. These methods allow scientists to observe, identify, and analyze the characteristics of these tiny organisms.
| 5. How do microorganisms impact human health? | |
Ans. Microorganisms can have both positive and negative impacts on human health. While some bacteria are essential for digestion and maintaining a healthy gut microbiome, others can cause infections and diseases. Understanding the role of different microorganisms helps in promoting health and preventing diseases through hygiene, vaccination, and antibiotics.
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