Organisms and Populations Test

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Organisms and Populations Test - 62

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Question 1
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In some cases, polpulation density is measured in terms of biomass rather than in terms of numbers becouse ________________________.

A
it is a more meaningful measure when the considered organisms vary greatly in size.

B
it is more convenient when population is huge and counting is impossible or very time consuming

C
it is a relatively constant measure

D
both a and b

Solution

Although the total number is most approprite measure of population density, but in some cases it is difficult to determine.In a forest area, spouse there are 200 Pathenium plants but only a single huge banyan tree with a large canopy. Stating that the population density of banyan is low relative to that of Pathenium, amount to underestimating the great role of bayan in that forest community.
Question 2
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In N = population density at time t, then population density at time +1 can be written as
$$N_t+1 = N_1 + [(A +B) - (C + D)]$$
Select the correct option for A, B, C and D in the above equation.

A
A can be mortality and B can be natality

B
B can be immigration and C can be natality

C
C can be mortality and D can be immigration

D
A can be natality and D can be emigration

Solution

A and B are nasality and immigration. They add to population density. C and D are mortality and emigration. They decrease population density
Question 3
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Which of the following factors has a negative effect on the population growth rate?

A
Emigration

B
Immigration

C
Natality

D
Fecundity

Solution

Emigration is permanent outward movement of individuals from a population for settlement into new area. It decreases the local population.
Question 4
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Which of the following is not an example of using relative density to measure population density in a certain area?

A
Counting pug marks of tigers to find population density of tigers a forest

B
Counting the number of fishes caught in a trap to find population density of fishes in a lake

C
Measuring biomass of bacterial culture to find out population density of bacteria in a petri dish

D
Measuring biomass of phytoplanktons in 1 cc water to find out population density of phytoplanktons in a lake

Solution

Option D is correct, because measuring of biomass of phytoplanktons is very time consuming and It is a microscopic task to measure only PHYTOPLANKTON in 1 cc water except other species found in the given water.
Question 5
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The given graph shows how much nitrate $$ \left( { NO }_{ \overline { 3 } } \right) $$ is exported from the continent towards the ocean by 16 major rivers in the world compared to the density of human populations living along those drainage basins (i.e., along these rivers). What interpretation can be drawn from this graph?

A
Nitrate exported through rivers from heavily populated cities can cause eutrophication and toxic algal bloom in marine coastal regions.

B
Small drainage basins export more $$ { NO }_{ 3 }^{-} $$.

C
Drainage basins with higher population densities export lesser $$ { NO }_{ 3 }^{-} $$.

D
Both (a) and (c)
Solution
- It is clear from the given graph that the concentration of the Nitrate ions in a river is directly proportional to the population density, whereas other options are incorrect according to the given graph and other options also do not follow eutrophication.
Hence, option A is correct.
Question 6
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For which of the following cases, population density can be easily determined by utulising non-biological parameter?

A
Fish density

B
Density of Bactria in culture plate

C
Siberian cranes at Bharatpur wetlands

D
Tiger census

Solution

Sometimes, for certain ecological investigations, there is no need to the absolute population densities. Relative densities serve the purpose equally well. In this case, population size is indirectly estimated without actually counting them. For example, the number of fishes caught per trap is good enough measure of its total population density in the lake. The tiger census in our National park and tiger reserves is often based on pug marks (animal's ft print ) and fecal pellets. So, the correct answer is 'Tiger census'.
Question 7
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A population with a larger proportion of older individuals than younger ones will likely to

A
grow larger and then decline

B
continue to grow larger indefinitely

C
decline

D
not experience a change in population size.

Solution

A population with large number of older individuals than younger ones is likely to decline since older individuals do not take in reproduction.
Question 8
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The density of a population in a given habitat during a given period, fluctuates due to changes in certain basic process On this basis, fill up boxes A and B the given flow chart with correct option.

A
A - Nasality, B - Mortality

B
A - immigration, B - Emigration

C
A - Nasality, B - immigration

D
both (a) and (b)

Solution

Nasality a Immigration add to the population denisity. Mortality and emigration decrease the population density.
Question 9
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Which of the following is not a factor that would limit the growth of a population?

A
Food shortage

B
Immigratin

C
Disease

D
Famine

Solution

Immigration is the permanent inward movement of some individuals coming from outside into an existing population.This increases population density and would not limits growth.
Question 10
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Total number of individuals of a species per unit area and per unit time is called

A
Population size

B
Population density

C
Demography

D
Population dynamics

Solution

Population density is the number of individuals present per unit area or volume at a given time. If the total number of individuals is represented by the letter N and the number of units of space (area for land organisms and volume for water organisms) by the letter S, then the population density D can be represented as D =N/S. For instance, number of animals per square kilometer, number of trees per acre in a forest, etc.
So, the correct answer is option B.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 62

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Organisms and Populations Test - 62

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SHARING IS CARING

Question 1

it is a more meaningful measure when the considered organisms vary greatly in size.

it is more convenient when population is huge and counting is impossible or very time consuming

it is a relatively constant measure

both a and b

Solution

Question 2

A can be mortality and B can be natality

B can be immigration and C can be natality

C can be mortality and D can be immigration

A can be natality and D can be emigration

Solution

Question 3

Emigration

Immigration

Natality

Fecundity

Solution

Question 4

Counting pug marks of tigers to find population density of tigers a forest

Counting the number of fishes caught in a trap to find population density of fishes in a lake

Measuring biomass of bacterial culture to find out population density of bacteria in a petri dish

Measuring biomass of phytoplanktons in 1 cc water to find out population density of phytoplanktons in a lake

Solution

Question 5

Nitrate exported through rivers from heavily populated cities can cause eutrophication and toxic algal bloom in marine coastal regions.

Small drainage basins export more $$ { NO }_{ 3 }^{-} $$.

Drainage basins with higher population densities export lesser $$ { NO }_{ 3 }^{-} $$.

Both (a) and (c)

Solution

Question 6

Fish density

Density of Bactria in culture plate

Siberian cranes at Bharatpur wetlands

Tiger census

Solution

Question 7

grow larger and then decline

continue to grow larger indefinitely

decline

not experience a change in population size.

Solution

Question 8

A - Nasality, B - Mortality

A - immigration, B - Emigration

A - Nasality, B - immigration

both (a) and (b)

Solution

Question 9

Food shortage

Immigratin

Disease

Famine

Solution

Question 10

Population size

Population density

Demography

Population dynamics

Solution

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