Answer the following questions in one word or in a sentence only. |
(i) What do you understand by excretion? |
Answer the following questions in one word or in a sentence only. |
(ii) What is motion? |
Answer the following questions in one word or in a sentence only. |
(iii) Do you observe your shadow in a dark room or at night when there is no light? |
Answer the following questions in one word or in a sentence only. |
(iv) In which part of a flower are you likely to find the ovary? |
Answer the following questions in one word or in a sentence only. |
(v) What is magnetite? |
Answer the following questions in one word or in a sentence only. |
(vi) How much water is required to produce each page of a book? |
To what use can you put the following kinds of garbage and how? |
(i) Rotting smelly garbage |
(ii) Dry leaves collected in garbage |
Fill in the blanks: |
(a) ...................... is caused by deficiency of vitamin D. |
(b) Deficiency of ................ causes a disease known as beri-beri. |
(c) Deficiency of vitamin C causes a disease known as................. |
S. No. | Change | Can be reversed (Yes/No) |
(i) | The sawing of a piece of wood | |
(ii) | The melting of ice candy | |
(iii) | Dissolving sugar in water | |
(iv) | The cooking of food | |
(v) | The ripening of a mango | |
(vi) | Souring of milk |
(a) Suggest a situation where we obtain more than one shadow of an object at a time. |
(b) What is light? |
(a) The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why? |
(b) When you switch on the torch which part of the bulb glows? |
(a) Define transpiration. |
(b) Why is there a need for conserving water? Give two reasons. |
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