HOLIDAY HOME WORK CLASS 7 SCIENCE (22-5-20 )

HOLIDAY HOMEWORK –SCIENCE CLASS-7 (2020-21)

                          WEEK -1

Do the worksheet on the lesson  -FOOD, in your notebook

LEVEL -A

    1.  WRITE THE SCIENTIFIC TERMS FOR THE FOLLOWING:  
    a.Animals which eat grass only.    ………………………………

    b. Animals which eat both plants and animals.   ………………..

    c  .Animals which eat meat only.   ………………………….

   d. .Green plants which make their own food.   ……………………..  
   e.    Organisms which cannot make their own food and depend on other organisms for their food.   ……………………………….

f.     f.The process by which green plants make their own food.  ………………………..

    g.     Small pores on the under surface of leaves through which exchange of gases takes place.  
   h .The process of taking in food and utilising it by the body.  ……………………..

LEVEL -B

2.       WRITE TWO EXAMPLES OF EACH OF THE FOLLOWING :

a .Saprophytes    ……………………..     …………………………….

b.Total parasites    ……………………….   ………………………………..

c. Insectivorous plants    …………………………….    ………………………………..

d. Symbionts   …………………………     …………………………………….

e. Nitrogenous fertilisers   ……………………………..    ………………………………

3. DEFINE THE FOLLOWING TERMS:

a. Parasites

b. Saprophytes

c. Symbiosis

4.Write an equation for the process of photosynthesis.

LEVEL  - C

5. How is the rate of photosynthesis affected by-

a. light intensity.

b. nature of light

c. carbon di oxide

d. temperature

.6. Why does a pitcher plant trap insects when it can prepare its own food ?

7. How are partial parasites different from total parasites ?

8. TELL ME WHY?

a. Why does only the green part of a coleus leaf turn blue-black when bleached and tested with iodine  solution ?

b. Why do farmers add nitrogenous fertilisers to the soil in which plants grow , when there is enough nitrogen in the atmosphere ?

c. Why do farmers not add nitrogenous fertilisers to the soil in which legumes grow ?

- Fun activity-    I AM A LITTLE CHEF!      

Prepare- lassi , cucumber raita, sprout salad, mango shake, sandwich

                                WEEK  - 2   

Do the worksheet on –FOREST –OUR LIFELINE, in your notebook.

TYPE -  A

1.WRITE THE SCIENTIFIC TERMS-

a) A very large cultivated piece of land densely covered with various types of plants.

b) Organisms which makes their own food from inorganic substances.

c) Judicial use of natural resources without their wastage.

d)Plants having a life span of one year.

e)The branchy part of a tree above the stem.

2. DEFINE THE TERMS-

a) canopy  b) saprophytes   c) undrstorey

3.ANSWER THE FOLLOWING QUESTIONS-

a) Write three uses of forests.

b) Give an example of a food chain.

TYPE- B

4. CHOOSE THE ODD ONE OUT. GIVE A REASON

a)Herbivore, plants, carnivores, omnivores

b) Mushroom, cow, yeast, bacteria

5.FILL IN THE BLANKS

a) Large scale cutting of trees is called ............

b) People  in forests must avoid smoking and cooking in forests as this can cause a ......... .............

c) The forest floor is rich in  ................. ,that is why it appears dark in colour.

6. ANSWER THE FOLLOWING QUESTIONS

 a)List three consequences of deforestation..

b) List three causes of deforestation

7. Study the food chain given below and answer the questions that follow.

GRASS  > GRASSHOPPER > FROG > SNAKE > EAGLE

a) What will happen if   producers are removed from the food chain?

b) Are all consumers dependent on  producers ?

c) What will happen if snakes were removed from the food chain?

 Fun activity-   I AM A KEEN OBSERVER!

Observe and write three food chains / food webs in your notebook . You may draw pictures also to make it attractive.

                                         WEEK -  3

Do the worksheet on the lesson –HEAT, in your science notebook.

TYPE –A

1.       FILL IN THE BLANKS

a)       …………………………. Is measured in degrees.

b)      The normal temperature of the human body is …………………

c)       The units  of temperature are  ………………………. ,  ………………………. and  ……………………….

d)      Heat flows from  ……………………….. objects to  …………………….  Objects.

2.       TICK THE CORRECT ANSWER

a)      A good conductor of heat is

i)                    Copper  ii) wood      iii) plastic   iv) all of them

b)      The metal used in a thermometer is

i)                    Gold    ii) silver   iii) mercury   iv)copper

c)       Land breeze blows during the

            i)       Day   ii) night   iii)  day and night  iv) none of them

3.       SHORT ANSWER TYPE QUESTION

a)      Name the three ways in which heat can be transferred.

b)      How does heat generally get transferred in solids ?

c)       Give two examples of insulators.

d)      What is the clinical thermometer used to measure ?

e)      What prevents the mercury from falling down in a clinical thermometer?

TYPE – B

1.       WRITE THE WORDS CONDUCTION, CONVECTION OR RADIATION IN THE FOLLOWIG SITUATIONS

a)      Cool air from air conditioners moves towards the ground.

b)      Air is warmer near the ceiling than the floor.

c)       We sit in front of an electric heater and feel warm.

d)      Water heated in a vessel starts to boil.

e)      A metal spoon kept in a hot glass of milk becomes warm.

2.WRITE TRUE OR FALSE FOR THE STATEMENTS GIVEN BELOW

a) We prefer wearing light coloured clothes in winters.

b) The heat from the sun reaches the earth due to convection.

c)Black surfaces are better absorbers than polished surfaces.

d)Sea breeze blows due to convection .

e) Heat is liquids gets transferred through radiation.

3.GIVE REASONS FOR THE FOLLOWING STATEMENTS

a) wearing more layers of clothes keeps us warmer in winters.

b) A glass tumbler cracks when very hot water is poured in it,

c)Houses with thatched roofs are cooler in summers.

4. ANSWER THE FOLLOWING QUESTIONS

a) Why is conduction only possible in solids ?

b) Why is the base of cooking utensils painted black ?

c) Why does a metal cup become hot when hot tea is poured into it ?

TYPE –C

1.DISTINGUISH BETWEEN

a)Conduction , convection and radiation

b)Land and sea breeze

c)Good Conductors of heart and  bad conductors

d)Clinical and laboratory thermometers

1.ANSWER THE FOLLOWING

a)Why can we not use a laboratory thermometer to measure our body temperature

b)What is the temperature range of the clinical and laboratory thermometers ?

c)Why is  the inner surface of an electric heater polished ?

d)Why are the radiators of cars painted black?

HOTS

a)Why are deserts very hot during the day and cold during the night?

b)Why are gaps left in between rails when railway tracks are laid ?

c)Why are electric wires between poles kept a little hanging / loose ?

d)Rahul is going for a desert safari in the afternoon , to prevent himself from  feeling very hot he should wear clothes that are

i)White   ii) black   iii) red   iv) navy blue

e)In which state of india would houses be made of mud so that they are cool in summers ?

i)Rajasthan  ii)  Maharashtra  iii) Himachal Pradesh iv) Jammu-Kashmir

-Fun activity-   TOUCH AND TELL!

Keep water and sand (mud) in two separate containers. Keep them in an open space. Touch them with your hands at three different times of the day –morning , noon and night. Make a note of which of them is warmer and cooler at different times of the day. Draw a conclusion.

                                       WEEK-  4

Do the worksheet on the lesson – WATER, in your notebook.

Type A

A           Fill in the blanks :

1.      The continuous cycling of water in nature is termed the…………………………….

2.      Water  can be found  as ice in the……………….. state, water in the……………state and  as water vapour in the……………..state.

B            Give the Scientific term:

1.      The minimum depth in the soil where  all pore spaces are filled with water :___________

2.      Huge reservoirs of water inside the earth are called _____________________

3.      How can you minimize the wastage of water ?

 4. What is Drip Irrigation?

5.      What is Rain Water Harvesting?

Type B

D           Give Reasons                   

a)   Plants need water.

b)  The water table level is falling in most places

c)  Drip irrigation is an effective method of irrigation

TYPE C

Asset Questions

E            Freshly fallen snow is a better heat insulator than old hard-packed snow. Why ?

i)                    Freshly fallen snow is lighter

ii)                  Freshly fallen snow is much softer

iii)                Freshly fallen snow is at a higher temperature

iv)                Freshly fallen snow has more air trapped between crystals

-Fun activity –   SAVE AND CONSERVE!

Make a list of activities in your house where water is being wasted or is being over used. Also write in front of each of them ,ways by which you can help to prevent wastage  or over use of water.

                                    
                             
                               WEEK - 5

Read the lesson –SOIL. Do all the objective questions given at the end of the lesson in your reader itself

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