Pesticides infect the egg sheaths of the sparrows. Based on your understanding of what a ‘sheath’ is, choose
an option which lists the illustration/image that uses a sheath.
a) Image (i)
b) Image (ii)
c) Image (iii)
d) Image (iv)
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Image iv is the option which makes use of a sheath.
Sheath is the cover that you put on the top of a sword or on the top of any other equipment like a knife which is a sharp weapon. In the image that has been given here, the fourth image is of a sword which is a sharp weapon, thus a sheath is used for this.
Sheaths can be made of a variety of material which can either be leather, it can be wood or a sheath can also be made up of some kind of metals like the brass or the steel.
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The option (iv) from the following uses a sheath.
Explanation:
- Sheath is a cover which closely fits the knife or sword. It is used to carry the sharp objects without any harm.
- It is also used to refer the fat tissues that are just below the egg shells. The yolk is protected by sheath. When the pesticide infect sheath, then the eggs die.
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