Question
Explain how, deforestation makes the soil infertile leading to desertification.
✓
Answer
Deforestation in simple term means the felling and clearing of forest cover or tree plantations to accommodate agricultural, industrial or urban use. It involves permanent end of forest cover to make that land available for residential, commercial or industrial purpose. Deforestation can also be seen as removal of forests leading to several imbalances ecologically and environmentally. What makes deforestation alarming is the immediate and long-term effects it is bound to inflict if continued at the current pace. Some predictions state that the rainforests of the world will be destroyed completely if deforestation continues at its current pace.
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Gravitational force is related to weight. List some points to justify this statement.
During adolescence, the body of boys and girls undergoes certain changes. Given below are few of those changes
(a) Broad shoulders
(b) Wider chests
(c) Wider region below waist
(d) Development of muscles
(e) Development of mammary glands
(f) Growth of facial hair
(g) Acne and pimples on face
(h) Development of sex organs
(i) High-pitched voice
(J) Growth of pubic hair
Categorise these changes into those that occur in boys and those that occur in girls and fill in the table given below.
Body changes during adolescence
(a) Broad shoulders
(b) Wider chests
(c) Wider region below waist
(d) Development of muscles
(e) Development of mammary glands
(f) Growth of facial hair
(g) Acne and pimples on face
(h) Development of sex organs
(i) High-pitched voice
(J) Growth of pubic hair
Categorise these changes into those that occur in boys and those that occur in girls and fill in the table given below.
Body changes during adolescence
| Boys | Girls |
Give one use each of the following metals:
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$b.$ Copper
$c.$ Aluminium
$d.$ Zinc
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→$a.$ Iron
$b.$ Copper
$c.$ Aluminium
$d.$ Zinc
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Down
$1)$ Providing water to the crops.
$2)$ Keeping crop grains for a long time under proper conditions.
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Across
$3)$ A machine used for cutting the matured crop.
$4)$ A rabi crop that is also one of the pulses.
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$1)$ Providing water to the crops.
$2)$ Keeping crop grains for a long time under proper conditions.
$5)$ Certain plants of the same kind grown on a large scale.
Across
$3)$ A machine used for cutting the matured crop.
$4)$ A rabi crop that is also one of the pulses.
$6)$ A process of separating the grain from chaff.
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(ii) Name two devices which is based on the multiple reflection between two plane mirrors.
(ii) How do we determine the number of images formed by two plane mirrors at a certain angle?
(iii) How do we determine the number of images formed by two plane mirrors at a certain angle?
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(ii) Name two devices which is based on the multiple reflection between two plane mirrors.
(ii) How do we determine the number of images formed by two plane mirrors at a certain angle?
(iii) How do we determine the number of images formed by two plane mirrors at a certain angle?