A garbage collector separate items mentioned below in the
garbage into red, green and blue containers for their transfer
to landfill, composting pit, and recycling unit respectively.
Items:
(i) Plastic bags
(ii) Newspaper and journals
(iii) Screw and nuts
(iv) Vegetable peels
(v) Metal chips
(vi) Egg shells
Which item were transferred to which bin?
RED GREEN BLUE
(a) (i) and (iv) (ii) and (iii) (v) and (vi)
(b) (i) and (iii) (ii) and (v) (iv) and (vi)
(c) (i), (iii) and (v) (iv) and (vi) (ii) only
(d) (i) and (v) (ii) and (iv) (iii) only
Paheli gave the following ill effects of the practice of burning dried leaves and other plant parts
(i) Burning degrades the soil.
(ii) Burning produces harmful gases/fumes.
(iii) Precious raw materials to obtain manure at low cost is lost.
(iv) Lot of heat is generated unnecessarily.
The correct reasons of why we should not burn leaves are
(a) i, ii and iv only
(b) i, ii, iii, and iv
(c) ii and iii only
(d) ii, iii, and iv only
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.
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