SEBA Class 8 Science Important Chapter 2 Micro-Organisms: Friend and Foe

SEBA Class 8 Science Important Chapter 2 Micro-Organisms: Friend and Foe Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 2 Micro-Organisms: Friend and Foe

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Micro-Organisms: Friend and Foe

Chapter: 1

PART – I

IMPORTANT QUESTION ANSWER

A. Short Type Questions & Answers

1. What are micro-organisms?

Ans: Micro-organisms are tiny living organisms that cannot be seen with the naked eye, such as bacteria, fungi, protozoa, and viruses.

2. What is the role of Lactobacillus in making curd?

Ans: Lactobacillus bacteria convert milk into curd by fermenting the lactose in milk.

3. What is the function of yeast in bread making?

Ans: Yeast ferments sugars in dough, producing carbon dioxide that causes the dough to rise.

4. What is pasteurization?

Ans: Pasteurization is the process of heating milk to about 70°C for 15-30 seconds and then chilling it quickly to kill harmful microbes.

5. How do microbes help in agriculture?

Ans: Microbes like Rhizobium fix nitrogen in the soil, enriching it and promoting plant growth.

6. What is fermentation?

Ans: Fermentation is a process where yeast converts sugar into alcohol and carbon dioxide, used in the production of alcohol and bread.

7. What are antibiotics?

Ans: Antibiotics are medicines that kill or stop the growth of harmful microorganisms causing infections.

8. How do micro-organisms cause food spoilage?

Ans: Micro-organisms like fungi and bacteria grow on food and produce toxic substances that spoil the food and make it unsafe to eat.

9. What is the function of nitrogen-fixing bacteria?

Ans: Nitrogen-fixing bacteria convert atmospheric nitrogen into usable compounds for plants, enriching the soil.

10. How do viruses reproduce?

Ans: Viruses reproduce inside the cells of host organisms, such as bacteria, plants, or animals.

B. Fill in the Blanks

1. Micro-organisms are __________ that can only be seen under a microscope.

Ans: Tiny organisms.

2. __________ is a process used to preserve milk by killing harmful microbes.

Ans: Pasteurization.

3. __________ bacteria help in the fixation of nitrogen in leguminous plants.

Ans: Rhizobium.

4. __________ is the process by which yeast converts sugar into alcohol.

Ans: Fermentation.

5. Vaccines protect us from diseases caused by __________.

Ans: Micro-organisms.