holiday homework class 8- science

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This blog has instructions for your Holiday HW. Read it carefully.

CLASS 8

SCIENCE HOLIDAY HOMEWORK

            All the worksheets have been uploaded on REDOX.

WEEK 1

Cell: Structure and Functions

·        Read the chapter thoroughly.

·        Practice Questions from the book.

·        Draw and Practice all the diagrams discussed in the class.

·        Solve WORKSHEET of the chapter Cell in the notebook.

CLASS 8 SCIENCE   LESSON 8 -CELL -STRUCTURE AND FUNCTIONS       

              LEVEL  - A

1.   ANSWER IN ONE WORD ONLY :

• The structural and functional unit of life.  …………………………
•  Organisms in which all functions of the body are carried by a single cell.   …………………………..
•     Organism in which various functions in the body are divided among different groups of cells.  ……………………………
• The outer boundary of the cell.    ……………………………………..
•  The control center of the cell.   …………………………………
• Cell organelles which produce energy from food during respiration.   …………………………
•    A thick jelly like fluid inside the cell membrane.   ……………………………
• The outer most protective layer in a plant cell.   …………………………………

LEVEL – B

2.  WRITE THE FUNCTIONS OF THE FOLLOWING CELL ORGANELLES :

a)     Endoplasmic reticulum

b)    Ribosomes

c)     Lysosomes

d)    Nucleus

e)     Chromosomes

f)      Cell membrane

LEVEL – C

3.Distinguish between

a) Prokaryotic and eukaryotic cells.

b) Plant and animal cells ( four differences)

4.Name the three types of plastids. Write one line about each.

5.Identify the unicellular organisms with help of the clues given below:

a) It has body projections called pseudopodia. ………………………………..

b) It is slipper shaped and moves with help of cilia.  ………………………….

c) It is  spindle shaped and has a flagellum that helps it in movement. ……………………..

d) It is green in colour due to the presence of chloroplast and floats with help of flagella. ………………………………

e) It causes fermentation in foods containing carbohydrates. ………………………

6. DRAW WELL LABELLED DIAGRAMS OF PLANT AND ANIMAL CELLS.

WEEK 2

Force and Pressure

·        Read the chapter thoroughly.

·        Practice Questions from the book.

·        Solve WORKSHEET of the chapter Force in the notebook.

    

WEEK 3

Subject Enrichment Activity

·        Read the chapter- Stars and the solar system thoroughly for the subject enrichment activity scheduled in the month of July.

Research Work

·        Know about all the Sustainable Development Goals (SDGs).

·        Pick up one goal and you can do one of the following:

1.     Prepare a poster of that goal on an A4 size sheet.

2.      A small write up on what you understand from that goal. (Do not copy from internet, showcase your creativity).

             

(For your reference)

WEEK 4

Light

·        Read the chapter thoroughly.

·        Practice Questions from the book.

·        Draw and Practice all the diagrams discussed in the class.

·        Solve WORKSHEET of the chapter Light in the notebook.

    

WEEK 5

Microorganisms: Friend and Foe

·        Read the chapter thoroughly.

·        Practice Questions from the book.

·        Draw and Practice all the diagrams discussed in the class.

·        Solve WORKSHEET of the chapter Microbes in the notebook.

 MICROORGANISMS AND VIRUSES – FRIEND AND FOE! WORKSHEET

        TYPE A

1.  Name the following:

a.     Two communicable diseases

b.     A disease caused by droplet infection

c.      Two useful bacteria

d.     The gas liberated during fermentation

e.     Two well known antibiotics

f.       Two vaccines given to a child before 2 year of age

g.     A plant disease caused by a:

1.     Fungi

2.     Bacteria

3.     Virus

h.     Two insects that are carriers of disease causing microorganisms

 2.    Give reasons:

a.     Yeast is used in the preparation of bread,

b.     Children need to be vaccinated.

c.      We need to cover our mouth while sneezing or coughing.

d.     Foodstuffs need to be kept covered.

3.   State two advantages of food preservation.

 4.Explain any one method of food preservation.

5. State two symptoms of food poisoning.

6. State 4 ways how one can prevent the spread of disease organisms.

7.How does a vaccine work?

Type B

1.     Name the following:

a.     Two chemical preservatives.

b.     The bacterium that causes food poisoning.

c.      The gas present in packets of most snacks.

d.     The protozoan that causes malaria.

e.     The vector for dengue virus.

f.       The vector for malaria.

g.     Two fertilizers that provide nitrogen to plants.

h.     The treatment used to preserve milk.

i.        The alga that fixes nitrogen.

j.       Two enzymes present in yeast.

k.     The scientist who discovered the first vaccine against smallpox.

2.     How does a healthy person get infected by malaria?

3.     Define vector. How does a housefly spread diseases?

4.     State the two symptoms of foot and mouth disease.

5.     State two ways how diseases in plants can be controlled?

6.     How does cooling help to preserve food?

7.     Explain one natural way of fixation of nitrogen.

8.     State two characteristic features of a virus.

TYPE C

1.     Draw a well labeled diagram of Bacteriophage.

2.     Explain how atmospheric nitrogen is fixed during rain when lightning strikes.

3.     Why does curd set faster in summer than in winters?

4.     Why should we insist on the use of a new needle when we go for a blood test?

5.      What causes a danger of food poisoning in canned food? How can we prevent this danger?

6.     State two symptoms of an animal suffering from any disease. State two ways how diseases in animals can be prevented.

7.     State two ways how soil fertility can be increased.

 

        Be safe and enjoy your holidays!

        Stay Happy! Stay Fantastic😊