class 8

METALS AND NON METALS

Name the following questions:-

1. Name some common non-metals used in our daily life.

2. Hardest naturally occurring substance.

3. Property of metals which make them useful as electric wires.

4. Non – metal which has metallic luster.

5. Two non metals which are soft solids.

6. Non metals do not conduct electricity or heat except for one . Name it.

7. An allotrope of carbon which is as tensile as steel.

8. Metals that are not attacked by cold water, boiling water or stream.

9. The property of metals by virtue of which these can beaten into sheets.

10.Non metals used in disinfection of drinking water.

II. Answer the following( in one or two words)

1. What are the elements called which can neither fit with metals nor non metals?

2. Which of the following metals is the best conductor of heat and electricity? Gold, Silver, Copper, Aluminum

3. Which property of metals makes them useful as ringing bells?

4. Arrange the following elements in order of increasing reactivity. Sodium, Magnesium, Copper, Zinc, Aluminum

5. An oxide solution of which of the following elements will turn blue litmus red.

6. Which non-metal is used in making pencil lead?

7. Identify the most reactive and least reactive metal amongst the following Aluminum, Potassium, Copper, zinc, Gold

8. State the nature of oxides of non-metals.

9. Give an example of neutral oxide .

10.Which non metal is kept under water and why?

                                                                 class 7

Respiration in organisms

Q1 Name the following:-

       a) Inside the cells the breaking of food into water and carbon di oxide

       b) Cockroach breathe by these structures

       c) In fishes these are the breathing structures.

       d) The products formed as a result of glucose breakdown

       e) The type of respiration taking place in our muscles.

        f) A large muscular sheet that forms the floor of the chest cavity

Q2 Fill in the blanks:-

       i)I f the food is broken with the help of oxygen , it is called as ------------.

       ii) In earthworm exchange of gases takes place through----------

       iii) A cell is the smallest ------- and ----------- unit.

       iv) during breathing ----------- and ------------ take place alternately.

       v) Leaves have tiny pores called ----------.

Q3 Why do all organisms respire?

Q4 What is the difference between aerobic and anaerobic respiration .Write equations for both.

Q5 Why are yeasts used to make wine and bear?

Q6 Why do we get muscle cramps after heavy exercise?

Q7 Draw and label a neat diagram of human respiratory system.

Q8 What would happen if a potted plant is over watered

Q9.How is respiration different from breathing?

Getting to know Plants

 - Assignment - 3

1. Enlist the function of roots?

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2. Enlist the function of stem?

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3. Enlist the function of Leaf?

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4. Give 2 examples of each __

a. Harbs .................... , ......................

b. Shrubs .................... , ......................

c. Trees .................... , ......................

5. What are the main difference between a taproot and fibrous root?

Taproot Fibrous root.

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6. Fillup the following by using kewords given ____

Pistil, stem, root, anther, petal, filament.

i) The underground part of the plant is called _______________.

ii) The female reproductive part of the plant is _______________.

iii) The part of plant that conduct water and mineral is called __________.

iv) _________ and ___________ are parts of stamen.

v) ________ is the most attractive part of the flower