St. John’s E.M High School(Affiliated to the Central Board of Secondary Education, New Delhi)

Class: VIII ____________________________________________________________________________________________

Stay Home Stay Fit

The exercises given in this Worksheet are

supposed to be done in a new notebook…..

DIGITAL CLASSES THROUGH VIDEOS AND RELATED

WORKSHEETS WILL BE CONTINUED UNTIL FURTHER

St. John’s E.M High School(Affiliated to the Central Board of Secondary Education, New Delhi)

Vijayawada

Worksheet – 6, 2020-21 ____________________________________________________________________________________________

The exercises given in this Worksheet are

to be done in a new notebook…..

DIGITAL CLASSES THROUGH VIDEOS AND RELATED

WORKSHEETS WILL BE CONTINUED UNTIL FURTHER

INFORMATION

St. John’s E.M High School (Affiliated to the Central Board of Secondary Education, New Delhi)

Date: 05-05-2020 ____________________________________________________________________________________________

The exercises given in this Worksheet are

to be done in a new notebook…..

DIGITAL CLASSES THROUGH VIDEOS AND RELATED

WORKSHEETS WILL BE CONTINUED UNTIL FURTHER

Now you know regular exercise has lots of health benefits for

children and young people. Copy the given poses and hold for

20 seconds. Relax.

Use one of the following pairs to complete each sentence :

Either …. Or, neither … not, both …. And, not only ….. but also, whether … or

1. “Could I came over at ___________ three ___________ four o’clock?” asked Joan.

2. The teacher refused to mark his work because his book was ___________ torn

___________ dirty.

3. I really need a holiday but ___________ in spain ___________ France.

4. I’m going to fish tomorrow, ___________ it rains ___________ shines.

5. ___________ did he borrow a lot of money from us, he ___________ refused to

pay back a single cent.

6. The children at the centre can ___________ hear ___________ speak.

THOROUGHLY READ THE ABOVE CONCEPT, UNDERSTAND IT AND ANSWER THE

BELOW PRACTICE QUESTIONS:

7. She employs a maid to do ___________ the cooking ___________ washing for her

family.

8. We have enough spices for only one type of curry. We can cook ___________

chicken curry ___________ mutton curry.

9. The boy is really talented. He ___________ knows how to play the piano

___________ can also compose music.

10. I do not like him. He is ___________ rude ___________ selfish.

11. We do not know ___________ it’s you ___________ me who will have to do it.

12. Each class is to present ___________ a drama ___________ a song for the concert.

13. The invitation is for two persons, so ___________ jack ___________ his wife can

attend the function.

14. We are waiting for the boys. ___________ Roy ___________ Joseph has come yet.

15. Alfred ___________ got up late this morning ___________ missed the train.

16. “Why is the baby crying?” “___________ she is hungry ___________ her nappy

needs changing.”

17. ___________ we go now ___________ in an hour’s time, it doesn’t matter as it’s

still very early.

18. Our yellow House was ___________ first ___________ last in this year’s sports.

19. “Oh, dear! I have left ___________ my purse ___________ keys in the other bag,”

said Jean.

20. __________ you ask Mary ___________ Lucy, she will give you the same answer.

……………………………………………………………………………………………..

RATIONAL NUMBERS

Worksheet

……………………………………………………………………………………………..

THOROUGHLY READ THE ABOVE CONCEPT, UNDERSTAND IT AND ANSWER THE

BELOW PRACTICE QUESTIONS:

Biology :

Lesson -2 Microorganisms –Friend and Foe. Part-2

◦ Useful microorganisms.

◦ Vaccines.

◦ Antibiotics.

◦ Diseases.

Usefulness of microorganisms:

1. Microorganisms help in the preparation of curd, bread, cake etc.

2. They are used to produce alcohol at large scale.

3. Yeast is used to prepare vinegar.

4. Microorganisms are used to make wines.

5. They act as cleaning agent and decompose the waste products into manure.

6. They destroy the plant and animal dead bodies by decomposing them.

7. They increase soil fertility by fixing nitrogen of atmosphere.

8. They are used in making medicines like antibiotics and vaccines.

9. They are used as preservatives for food items.

10. They help in various metabolic activities in our body.

Harmfulness of microorganisms.

1. Microorganisms are also very harmful to us.

2. They cause a number of diseases inhuman as well as in other animals. Common

cold, Tuberculosis, Measles, Chicken Pox, Polio, Cholera, Typhoid, Hepatitis B,

Malaria, are some common human diseases caused by microorganisms.

3. Anthrax is a serious disease in animals caused by microbes.

4. They also make food items unfit for use by food poisoning.

5. They also spoil clothes and leather products.

6. They also cause diseases in plants like blights in potatoes, sugarcanes, oranges etc.

7. They also reduce the crop production.

Microorganisms as antibiotics :

1. The medicines which kill or stop the growth of microorganisms in our body are

called antibiotics.

2. These are very useful to us as they prevent us from the effects of microorganisms.

3. Antibiotics are made from bacteria and fungi.

4. The penicillin is the first antibiotics which is discovered by Alexander Fleming in

1929.

5. These days a number of antibiotics are used to cure various human and animal

diseases. Streptomycin, Tetracycline, Erythromycin etc. are some common

antibiotics.

6. Precautions: We should take antibiotics only by the advice of a qualified doctor.

Antibiotics should only be taken when needed. Otherwise, they may be harmful and

become less effective in future

Worksheet

Answer the following questions :

1. Give examples of antibiotics.

2. Enlist some of the vaccines you know. ( which vaccine is given to the children of age

group 0-5year’s orally and freely by government hospitals?)

3. What is fermentation?

4. Tetracycline was discovered by --------------.

5. Bread mold is also called as -------------.

6. Algae is autotrophic or heterotrophic. Justify your answer.

………………………………………………………………………………………………

English Key :

1. since 2. unless 3. unless 4. whether 5. though --- yet

6.while 7. when 8. whether 9. as well as 10. so that

THOROUGHLY READ THE ABOVE CONCEPT, UNDERSTAND IT AND ANSWER THE

BELOW PRACTICE QUESTIONS:

Maths Key :

******

The following are the links of NCERT text books .

Click on them to view the lessons

Class VIII Science..

Force and pressure : http://ncert.nic.in/textbook/textbook.htm?hesc1=11-18

VIII - BIOLOGY-

CHAPTER 2 : MICRO ORGANISMS : FRIEND AND

FOE http://ncert.nic.in/textbook/textbook.htm?hesc1=2-18

CLASS VIII MATHS :

Rational numbers : http://ncert.nic.in/textbook/textbook.htm?hemh1=1-16