What are the basic properties of living things ? What arguments would you present to show that (a) a crystal, and (b) a candle flame are not alive, and that a mango tree is alive?

What would you observe at the (a) cathode (b) anode ?

What would you observe in the following ? Sugar crystals are added to a hard glass test tube containing concentrated sulphuric acid.

State what would you observe when : Washing soda crystals are exposed to the atmosphere.

Explain what would happen if: Ethylene is sprayed on a mango tree

Explain what would happen if: Ethylene is sprayed on a mango tree

We wish to obtain an equal sized inverted image of a candle flame on a screen kept at a distance of 4 m from the candle flame. (a) Name the type of lens that should be used. (b) what should be the focal length of the lens and at what distance from the candle flame the lens be placed ? (c) Draw a labelled diagram to show the image formation in this case.

What would you observe when crystals of iron (II) sulphate are heated in a test-tube strongly?

Look at the figure and answer the following questions. (a) What change would you observe in the calcium hydroxide solution taken in tube B ? (b) Write the reaction involved in test tubes A and B respectively. (c ) If ethanol is given instead of ethanoic acid, would you expect same change ? (d) How can a solution of lime water be prepared in the laboratory ?

When you look around, you see both living and non-living things. You must have wondered and asked yourself – ‘what is it that makes an organism living, or what is it that an inanimate thing does not have which a living thing has’ ? The answer to this is the presence of -

What would you observe when crystals of copper (II) sulphate are heated in a test tube strongly?