SCIENCE EXPERIMENTS CLASS 7-A

1. MODES OF TRANSFER OF HEAT-

CONVECTION IN LIQUIDS

CONDUCTION IN SOLIDS

2. LIGHT IS NECESSARY FOR PHOTOSYNTHESIS

     ASSIGNMENT WORKSHEET CLASS 8
  Name: ______________________                                                     Class: _____________

                                                                                                                               M.Marks:20

                               SYNTHETIC FIBRES AND PLASTICS

                                                                        

                                                                Worksheet  

                                                                                                                                              M.M- 20

I.Fill in the bubbles with different types of man-made fibres. List one special feature and one use for each  ( GRAPHIC ORGANIZER)                                                                                                                                                                                                                                                                                                                               (5)

                                                                                                                                                                                             

II.Classify the following as thermoplastic and thermosetting plastics.                                                                                                                                                        (5)

  Contact lenses, Non-stick pans, Styrofoam cup, Bags for food storage,Thermocol sheets, Handles of cooking utensils, Melamine plates,Electrical plugs and sockets, Furniture

III. List at least two differences between thermoplastic and thermosetting plastics                                                                                                                                                 (2)

IV.Indicate whether the statements are TRUE (T) or FALSE (F). Correct and rewrite the FALSE statements                                                                                                                                       (5)    

               

      i.        Polyester is a popular fabric because it is durable and easily washable.

    ii.        Nylon has a feel similar to wool.

   iii.        Cellulose from wood pulp is used to make rayon.

   iv.        Materials like acrylic are resistant to insects

    v.        Nylon fibres absorb water easily.

   vi.        Polymers are made up of smaller units called monomers.

  vii.        Silk and Wool, smell of burning hair when burnt

viii.        Burning of plastics leads to air pollution.

   ix.        Once set, thermosetting plastics can be made soft again

    x.        Plastics are good conductors of heat and electricity.

V .How can we protect our environment from plastic related problems?                                                                                                                                                           (3)  

                                  

                                                             ---------------

WORKSHEET-I CLASS-VII
NUTRITION IN PLANTS1. 
I. WORDCHOP

The table below contains words chopped in half. Find the words with the help of clues
given below.
VITA                OXY                  TION              SYNTHESIS             PHYLL
AUTO             NUTRI                GLU                MINS                        TROPH
COSE               CHLORO           RCH                 IOD                             GEN
NUTRI              PHOTO            ENTS                 INE                              STA
Clues:
1. The process of intake of food and its proper utilisation
______________________________________________________________________________
2. Component of food that provides energy
______________________________________________________________________________
3. An organism that can prepare its own food
______________________________________________________________________________
4. The process by which green plants prepare their own food
______________________________________________________________________________
5. Component of food that protects against diseases
______________________________________________________________________________
6. Gas released in photosynthesis
______________________________________________________________________________
7. Green pigment in plants that absorbs sunlight
______________________________________________________________________________
8. Food is produced in this form during photosynthesis
______________________________________________________________________________
9. Food is stored in this form in different parts of the plant
______________________________________________________________________________
10. This solution is used to test the presence of starch
______________________________________________________________________________
II. Tick (✓) the correct answer.

a. Which of the following is not present in carbohydrates?
i. Hydrogen       ii. Nitrogen        iii. Oxygen        iv. Carbon 

b. Plants obtain nitrogen from
i. air                   ii. water               iii. soil              iv. all of theses

c. Organisms that cannot prepare their own food from simple inorganic materials are
called
i. heterotrophs  ii. autotrophs           iii. producers                        iv. green plants

d. A ___________ plant lives on and derives nutrition from another plant.
i. host                       ii. parasitic                     iii. live                           iv. dead

e. The flower of Rafflesia weighs approximately
i. 10 kg                      ii. 100 kg                               iii. 1000 kg                    iv. 1 kg

f. A pale yellow twining often seen on treetops is
i. Rafflesia                  ii. Mistletoe                       iii. Bladderwort              iv. Cuscuta

III .State whether the following statements are TRUE or FALSE. Correct the false statements.

a. Photosynthesis can take place in the absence of sunlight.
___________________________________________________________________________
b. To destarch a plant, we keep it in sunlight for 2–3 days.
___________________________________________________________________________
c. Chlorophyll is present in chloroplast.
___________________________________________________________________________
d. Guard cells control the opening and closing of chloroplasts.
___________________________________________________________________________
e. Water and minerals are transported to upper parts of the plant from roots by root hair.
___________________________________________________________________________
                                                ----------------------

WORKSHEET -I Class-6
Chapter1: Our Food‐ Where does it come from?
 I. Multiple Choice Questions carrying one mark each: 
    
 (1) Excess intake of fatty food causes:       
 (a) Obesity                          (b) weakness       
 (c)Loss of weight              (d) All of these    

 (2) A very good source of animal protein is:      
  (a) Fish                                 (b) Honey       
 (c) Sugarcane                        (d) Goat    

 (3) Which of the following is not a source of milk:      
 (a) Cow                                         (b) Goat      
 (c) Sheep                                       (d) Pig     

 (4) An edible root is :        
  (a) cabbage                       (b) turnip                              
 (c) Potato                    (d) All of these   

  2. Match the following carrying one mark each: 
      
 (1) Producer                  (a) Bees        
(2) Carnivore                  (b) Cat       
 (3) Omnivore                  (c) Tiger         
 (4) Herbivore                  (d) Plant       
 (5) Honey                         (e) Goat

 3. Write True (T) or False (F) carrying one mark each: 
  
  (a) Honey is a highly nutritious food and easily digestible too.   
  (b) We seeds and leaves of mustard are edible.  
   
    (c) We should eat food that is expensive and not easily          available.    
   (d) Omnivores eat only milk products.    
   (e) Vegetable are a rich source of protein.

 4. Fill in the Blanks carrying one mark each:    
 (a) Vegetable are rich in…………… and ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐.    
 (b) Herbivores have _______________ grinding teeth
  (c) The spice clove is a ___________.   (d)  …..............and………………. are examples of spices.    
 (e) The ‐‐‐‐‐‐‐‐‐‐‐‐‐ is the part of the tomato plant that is eaten.

 5. Answer in one line only carrying two marks each:    
 (a) Name two sources of food.    
 (b) Name two plants whose leaves are edible   
  (c) Name two vegetables that are eaten raw and to that need to be cooked.    
 (d)What are producers?  
  (e) Draw a food chain.
                                               -------

WORKSHEET-CLASS 8
CROP PRODUCTION AND ITS MANAGEMENT

1. Select the correct word from the following list and fill in the blanks.

float, water, crop, nutrients, preparation

(a) The same kind of plants grown and cultivated on a large scale at a place is called _________.
(b) The first step before growing crops is ________ of the soil.
(c) Damaged seeds would _________ on top of water.
(d) For growing a crop, sufficient sunlight and _________ and _________ from the soil are essentiaL

2. Match items in column A with those in column B.

	A		B
(i)	Kharif crops	(a)	Food for cattle
(ii)	Rabi crops	(b)	Urea and super phosphate
(iii)	Chemical fertilisers	(c)	Animal excreta, cow dung, urine and plant waste
(iv)	Organic manure	(d)	Wheat, gram, pea
3 . Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.		(e)	Paddy and maize

4. If wheat is sown in the kharif season, what would happen? Discuss.

Answer

If wheat is sown in the kharif season (from June to October), then the whole crop might get destroyed because of many factors such as lack of optimum temperature, adaptability, availability of pests, etc. Kharif season includes the rainy season, which is not favourable for the growth of wheat crop. Therefore, wheat crop should not be sown during this season.

5. Explain how soil gets affected by the continuous plantation of crops in a field.

Answer

If continuous plantation of crops is done in the fields then the soil will become poor in necessary nutrients like nitrogen, phosphorus, potassium, etc. Plants require nutrients for their proper growth and functioning. When a farmer continues to grow crops one after the other, then all nutrients available in the soil reduce and the crop yield decreases automatically.
                                                                        -------------

 WORKSHEET -I CLASS IX

MATTER IN OUR SURROUNDINGS

1. What is matter? What are the physical states of matter?

2. With the help of an activity, show particulate nature of matter.

3. What are characteristics of particles of matter?

4. What is diffusion? Give an example

5.  Why a wooden table should be called solid?

.6. Why can we smell hot food from a distance?

7.  Why can a sponge be compressed though it is a solid?

8. If a bottle of perfume is opened in one corner of a room, it immediately spreads throughout the room. Why?

Answer: The molecules of a gas are free to move in a chaotic motion at a greater speed throughout the vessel  in which it is contained. When the bottle of perfume is opened in one corner of the room, the molecules of perfume move at random  motion in all direction and mix with the molecules of air and  reaches us

9  How can we say that air is a matter?

                                                            *****