megner is placed on a plastic plate with common pins spread on it, then
pins will stick all around the magnet. (b) pins will stick at the middle of the magnet
(@) pins will stick at the ends of the magnet.
(d) none of these
17. When a magnet is broken into pieces, the pieces
(a) bare both north and south poles.
(b) have only north poles
(c) have no poles.
(d) have only south poles.
18. Loss of water by plants is called
(a) transpiration (b) condensation (c) transportation (d) evaporation
19. Oxygen is used in hospitals for
(a) burning wastage
(b) artificial respiration
(© fermentation
(d) decomposition
20. Composting method in which earthworms are used is known as
(a) composting
(b) manuring
(C) vermicomposting
(d) decomposing
SECTION-B (2 marka
Answers
Answer:
17. When we break a magnet into two, both act as magnets, that is both have a north and south pole each. In both these pieces the corresponding north and south poles remain on the sides as in the original magnet. This means that the 2 broken sides must get oppositely polarized.
18.The process of losing water by plants is called transpiration. It is the process where plants absorb water through the roots and then give off water vapour through pores in the leaves.
19. Answer: Oxygen is used for Artificial respiration in hospitals.
20. This is called as vermicompost. This process is done only by worms, such as red wrigglers, white worms and earthworms
Explanation:
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