Which of the following activities does not reflect responsible behaviour with regard to waste disposal?
(a) Goods carried in paper bags or cloth bags.
(b) Waste collected in polythene bags for disposal.
(c) Waste separated into those that degrade and those that do not.
(d) Making handicrafts with used up notebooks.
If you dump kitchen waste in a pit, it may, after sometime
(a) convert into compost.
(b) convert into vermicompost.
(c) remain as such.
(d) remain forever in its dried form
The method of preparing compost with the help of earthworms
is called
(a) composting (b) vermicomposting
(c) manuring (d) decomposing
On a Sunday morning Paheli’s friend visited her home. She
wanted to see some flowering plants in the nearby garden.
Both of them went to the garden. While returning from the
garden they also observed some flowering plants on the road
side. But to their surprise they found that the leaves and flowers
of these roadside plants were comparatively very dull. Can you
help them to know why?
Paheli kept some water in a beaker for heating. She observed
that tiny bubbles appeared before the water started to boil.
She boiled the water for about 5 minutes and filled it in a
bottle up to the brim and kept the bottle air tight till it cooled
down to room temperature.
(a) Why did the tiny bubbles appeared?
(b) Do you think tiny bubbles will appear on heating the
water taken out from the bottle? Justify your answer.
Write just a few sentences for an imaginary situation if any of
the following gases disappear from the atmosphere
(a) oxygen
(b) nitrogen
(c) carbon dioxide
Explain the following observations very briefly
(a) A firki does not rotate in a closed area.
(b) The arrow of weather cock points towards a particular
direction at a particular moment.
(c) An empty glass in fact is not empty.
(d) Breathing through mouth may harm you.
Garima observed that when she left her tightly capped bottle
full of water in the open sunlight, tiny bubbles were formed all
around inside the bottle. Help Garima to know why it so
happened?
A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements
Air, oxygen, wind, water vapour, mixture, combination, direction, road, bottles, cylinders.
(a) The ______ makes the windmill rotate.
(b) Air is a ______ of some gases.
(c) A weather cock shows the ______ in which the air is moving at that place.
(d) Mountaineers carry oxygen ______ with them, while climbing high mountains.
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