Page 214 - Science Class 08

B. Fill in the blanks.

1. ______________ are the most important parts of our food because they contain adequate
amount of energy.

2. Microbes can survive in almost every kind of ______________ .
3. The main source of plas c is______________ .

4. Local corrosion is far ______________ than uniform corrosion.
5. Gold is used as a money in the ______________ trade and exchange.
C. Write a paragraph in your own words on each of the following.

1. Prepara on of soil : _____________________________________________________
_________________________________________________________________________

_________________________________________________________________________
2. Threshing : _____________________________________________________
_________________________________________________________________________

_________________________________________________________________________
D. Write the correct term for.
1. the microbes that have no cellular structure _______________________

2. the microbes that cause various diseases _______________________
3. the medium suitable for microbe-culture _______________________
4. the bacteria that spherical in shape _______________________
5. bacteria that make food reac ng with organic compounds _______________________
E. Very short answer ques ons.

1. What is agriculture?
2. Name any one unicellular microbe.
3. All plas cs have one common property, what is it?

4. What is fuel?
F. Short answer ques ons.
1. What are the advantages of prepara on of soil?
2. Define nutri on in microbes.
3. Define plas c.

4. What is gold?
5. Differen ate between primary fuels and secondary fuels.
G. Long answer ques ons.

1. What are weeds? How can we control them?
2. How bacteria are important for us?
3. Write some common uses of plas c.
4. What is mineral ? What do minerals include and what are their basic features?
5. Describe in brief the forma on of coal in the earth.

214 Science-8