Section BGive reasons for the following:(a) Soil gets affected by cont

1.	Section BGive reasons for the following:(a) Soil gets affected by continuous plantation of crops(b) Bread gets mould during rainy season.(c) Saving paper means saving trees.(d) Pure gold is not used for making jewellery(e) Dams are made broader at the base and narrower at the top.
Answer» a)Continuousplantation of crops in a field makes thesoilpoor in certain nutrients such as nitrogen, phosphorus, potassium, etc. Plants require nutrients for their proper growth and functioning b)Fungi thriveindark, moist and warm conditions, which is whybreadwill be become mouldy, more rapidlyduring the rainy season.During the rainy season, the air has a higher moisture content, which is ideal for fungal growth. c)Saving PaperisSavingthe Forests. ... In just a day, how many millions sheets ofpaperare used by Indonesian people, and thismeansthat there are millions of foresttreesare cut down to meet those needs. d)Pure goldis 24k and is extremely soft and malleable, thereby making it rare in jewellery.Goldof 20k, 18k and 14k are usuallyusedto makejewellery. The karat value ofgoldis reduced by mixing it with other metals, usually copper or silver. ... However, the value of thegoldalso decreases along with its karatage. e) This is because the pressure of the water is much greater deeper down and the damneeds to be thick at thebottom so that it is strong enough to withstand this larger pressure.

Section BGive reasons for the following:(a) Soil gets affected by continuous plantation of crops(b) Bread gets mould during rainy season.(c) Saving paper means saving trees.(d) Pure gold is not used for making jewellery(e) Dams are made broader at the base and narrower at the top.

Answer»

a)Continuousplantation of crops in a field makes thesoilpoor in certain nutrients such as nitrogen, phosphorus, potassium, etc. Plants require nutrients for their proper growth and functioning

b)Fungi thriveindark, moist and warm conditions, which is whybreadwill be become mouldy, more rapidlyduring the rainy season.During the rainy season, the air has a higher moisture content, which is ideal for fungal growth.

c)Saving PaperisSavingthe Forests. ... In just a day, how many millions sheets ofpaperare used by Indonesian people, and thismeansthat there are millions of foresttreesare cut down to meet those needs.

d)Pure goldis 24k and is extremely soft and malleable, thereby making it rare in jewellery.Goldof 20k, 18k and 14k are usuallyusedto makejewellery. The karat value ofgoldis reduced by mixing it with other metals, usually copper or silver. ... However, the value of thegoldalso decreases along with its karatage.

e) This is because the pressure of the water is much greater deeper down and the damneeds to be thick at thebottom so that it is strong enough to withstand this larger pressure.

Section BGive reasons for the following:(a) Soil gets affected by continuous plantation of crops(b) Bread gets mould during rainy season.(c) Saving paper means saving trees.(d) Pure gold is not used for making jewellery(e) Dams are made broader at the base and narrower at the top.

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