The City School

PAF Chapter

SCIENCE

Class – 8

Worksheets for Intervention Classes

The City School /PAF Chapter / Prep + Senior I Section / Worksheet for Intervention Class (1st Term)/History /Class – 6 Page 2 of 6

Micro-organisms and Diseases Q1. What are Micro-organisms? Give some examples of them.

Q2. Draw a Bacterial cell and describe its structures briefly.

Q3. How do micro-organisms release energy from food?

Q4. What are viruses? Why they are not considered as micro-organisms?

Q5. What are the uses of micro-organisms? Give examples.

Q6. What does the term biotechnology mean?

Q7. With the help of a flowchart explain how yoghurt is made.

Q8. How do Antibiotics help humans?

Q9. What are infectious diseases? Which organisms are responsible for spreading these infections?

Q10. Enlist the ways through which germs spread. Give examples for each way.

Q11. Can we prevent ourselves from being infected? If yes, suggest some ways to prevent infections from spreading.

Q12. What is natural defense mechanism of the human body? What is it made of?

Q13. Write the functions of the white blood cells in the body?

Q14. What does the word Immunization mean? How does it help?

Q15. Draw and label three shapes of bacteria.

Food and Digestion Q1. Why do u think that food is necessary for our bodies? (Give three reasons)

Q2. What are the different kinds of carbohydrates? What are they made up of?

Q3. Do you think fats is important for us? If so, enlist some functions of fats.

Q4. Deficiency in proteins can lead us to which disease? What are they needed in the body?

Q5. What is fiber? Why do u think they are important for us?

Q6. Complete the following table.

Q7. Water does not provide us with energy but still is needed why so?

Q8. Energy requirement of every individual is different. Explain.

Q9. What is a balanced diet?

Q10. What is digestion? Describe the two types of digestion.

Q11. Why is it important for the body to digest food?

Q12. Enzymes play an important role in our body. What are they? Give some examples and their uses.

Q13. This diagram shows the digestive system in the human body.

The City School /PAF Chapter / Prep + Senior I Section / Worksheet for Intervention Class (1st Term)/History /Class – 6 Page 3 of 6

The City School /PAF Chapter / Prep + Senior I Section / Worksheet for Intervention Class (1st Term)/History /Class – 6 Page 4 of 6

(a)Name the following parts:

A.________________ B._______________

C.________________ D._______________

E.________________ F.________________

X. _________________ Y. _________________

Q14. Complete the following table

Enzyme Found in Function 1. Salivary amylase 2. Lipase 3. Protease 4. Carbohydrases

Q15. What are villi? What is their function?

The City School /PAF Chapter / Prep + Senior I Section / Worksheet for Intervention Class (1st Term)/History /Class – 6 Page 5 of 6

Heating and Cooling Q1. What is temperature? How is it measured?

Q2. What is heat?

Q3. Give some differences between heat and temperature.

Q4. What are the effects of heat gain and heat loss? Also give examples to prove the effects.

Q5. What happens to substances when they are heated?

Q6. Why are gaps placed between railway tracks?

Q7. How does a hot air balloon rise high?

Q8. What problems does contraction and expansion create in our everyday life?

Q9. What are three ways of transfer of heat? Define them.

Q10. Which surfaces are good radiators and absorbers of heat? Give examples

Q11. Which surfaces are poor radiators and absorbers of heat?

Q12. Use the particle model of matter to explain why solids are better heat conductors than gases.

Q13. Which method of heat transfer cannot take place in vacuum?

Q14. Give two examples and uses of (a) good heat conductors (b) heat insulators.

Q15. Which instrument is used to measure temperature? Are there different types of these?

The City School /PAF Chapter / Prep + Senior I Section / Worksheet for Intervention Class (1st Term)/History /Class – 6 Page 6 of 6

Light Q1. What is light? What is its speed?

Q2. Why can’t light travel through opaque objects?

Q3. What is (a) ray (b) beam (c) luminous object (d) non-luminous object?

Q4. When can light get reflected, transmitted or absorbed?

Q5. What are transparent and opaque materials? Give examples of each.

Q6. What is purpose of pasting stickers on the glass doors?

Q7. What is a shadow? How are they formed?

Q8. What is umbra?

Q9. What is penumbra?

Q10. Draw and describe the angle of incidence and angle of reflection

Q11. What is reflection of light? Describe its two types.

Q12. Explain why can you see a sharp image on the smooth water surface but not on the wavy water surface?

Q13. What are the characteristics of an image formed on plane mirror?

Q14. Mirrors are used in our daily lives. How? What are the different kinds of mirrors?

Q15. What is refraction of light? Draw a diagram to show refraction of light

Q16. What are the effects of refraction?

Q17. What colour light is obtained when each of the following pairs of coloured lights are mixed?

(a) Cyan + red= _________________ (b) Blue + green= +_______________ (c) Magenta + green=____________ (d) Yellow + blue= ________________ (e) Red + green= _________________

Q18. Why does milk appear to be white in colour?