Is it Possible to achieve ‘zero population growth rate? If yes, what kind of age pyramid is obtained?
0 Answers
Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.
(a) Growth It is an irreversible and permanent process, accomplished by an increase in the size of an organ or organ parts or even of an individual cell. (b) Differentiation It is a...
1 Answers 1 views
(iii) The magnitude of population growth refers to (a) The total population of an area (b) The number of persons added each year
(b) The number of persons added each year
1 Answers 1 views
Is it Possible to achieve ‘zero population growth rate? If yes, what kind of age pyramid is obtained?
Yes. An inverted bell-shaped age pyramid is obtained. The young of pre-reproductive age group individuals are less in number and both pre-reproductive and reproductive stages are in the same level
1 Answers 1 views
Fifteen years from now Ravi’s age will be four times his present age. What is Ravi’s present age?
Let , the present age of Ravi be x Ravi's age after fifteen years = x+15 a\q, =>x+15 = 4x => 4x-x =15 => 3x =15 => x = 15/3 => x = 5 so,present age of Ravi...
1 Answers 1 views
Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of his mother’s present age.
At present, _________ Shobo's age = x years His mother's age = 6 times of Shobo's age = 6x years Five years from now ________________ Shobo's age = ( x + 5 ) years According to the problem given, x...
1 Answers 1 views
Aman’s age is three times his son’s age. Ten years ago he was five times his son’s age. Find their present ages.
Son age be x Aman age is 3x ten years ago son age x-10 aman age 3x -10 A/Q 5(x-10) = 3x -10 5x -50 = 3x - 10 2x = 40 x =20 3x=60 son present age =20 aman present age = 60
1 Answers 1 views
A merchant has 120 litres of oil of one kind, 180 litres of another kind and 240 litres of third kind.
Quantity of oil A = 120 liters Quantity of oil B = 180liters Quantity of oil C = 240liters We want to fill oils A, B and C in tins of the same...
1 Answers 1 views
Seema’s present age is four times her son’s present age and four-seventh of her father’s present age.
(b) Let Seema’s present age be x years. Then, Seema’s son’s present age = x/4 years Seema’s father’s present age = 7x/4 years. Then, x+ x/4 +7x/4= 32x3 12x = 96 × 4 x = 96...
1 Answers 1 views
If a population of 50 Paramoecium present in a pool increases to 150 after an hour, what would be the growth rate of population?
d. 100 per hour
1 Answers 1 views
The average age of 3 friends is 32 years. If the age of a fourth friend is added, their average age comes to 31 years.
(b) Age of the fourth friend = 31 × 4 - 32 × 3 = 124 - 96 = 28 years
1 Answers 1 views