(iii) The magnitude of population growth refers to
(a) The total population of an area
(b) The number of persons added each year
(c) The rate at which the population increases
(d) The number of females per thousand males
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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...
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Distinguish between population growth and population change
Population growth is about increase or decrease in the population. Population change is about changes in population composition; like age structure, sex ratio, literacy rate, occupational structure, etc.
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The magnitude of population growth refers to
(b) The number of persons added each year
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Bhuvan has some hens and some cows. If the total number of animal-heads are 71 and the total number of feet are 228,
(e) Let Bhuwan have x hens and y cows According to the question, x + y = 71 ...(i) 2 x + 4y = 228 ...(ii) Multiply equation (i) by 4 and subtract equation...
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Kishan has some hens and some cows. If the total number of animal heads are 59 and the total number of feet are 190,
(a) A hen has two legs whereas a cow has four legs. But both of them have one head each. Let Kishan have x cows Number of hens = 59 – x. According...
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Gopal has some hens and some goats. If the total number of animal heads are 43 and total number of feet are 142,
(c) Let the number of hens = x Number of goats = 43 – x According to the question, x × 2 + (43 – x) × 4 = 142 or, 2x +...
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Deepak has some hens and some goats. If the total number of animal heads is 90 and the total number of animal feet is 248,
(c) Let total number of goats be x. Then, total number of hens = (90 – x) So, x × 4 + (90 – x) × 2 = 248 4x...
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The total number of boys in a school is 24% more than the total number of girls in the school.
(b) Let the number of girls in the school be = 100 Number of boys = 124 Required ratio = 124 : 100 = 31 : 25
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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
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The total number of boys in a school are 16% more than the total number of girls in the school.
(e) Let the number of girls = x Number of boys = 1.16 x Required ratio = 1.16 x : x = 116 : 100 = 29 : 25
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