Organisms and Populations Test

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Organisms and Populations Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

National average of infant mortality rate is

A
58

B
86

C
85

D
15

E
40

Solution

The current Infant Mortality Rate (IMR) of India, as per the Sample Registration System (SRS) 2013, is 40 per 1,000 live births while the Under-5 Mortality Rate (U5MR) as per SRS 2012 is 52 per 1,000 live births.
So, the correct answer is option E.
Question 2
1 / -0

Highest infant mortality rate in India is in which of the following state?

A
U.P.

B
Bihar

C
M.P.

D
Rajasthan

Solution

For the 11$$^{th}$$ year in a row, the state of M.P. has registered the highest infant mortality rate in the country, according to the latest Sample Registration System report for 2013 released by the Registrar General and Census Commissioner of India. Infant mortality rate is the number of deaths of infants under one year per 1,000 live births. Madhya Pradesh, has the IMR of 54.
So, the correct answer is option C.
Question 3
1 / -0

The most thoroughly studied of the known bacteria-plant interactions is the

A
Cyanobacterial symbiosis with some aquatic ferns

B
Gall formation on certain angiosperms by Agrobacterium

C
Nodulation of Sesbania stems by nitrogen fixing bacteria

D
Plant growth stimulation by phosphate solubilizing bacteria
Solution
A. Correct option B
B. Explanation for correct option:
- Agrobacterium tumefaciens is soil-borne gram-negative bacteria that causes crown galls on most of the dicot leaves.
- It contains a plasmid also called the Ti (tumour inducing) plasmid, which is used widely in genetic engineering/recombinant DNA technology for creating transgenic plants or genetically modified plants.
- It contains a plasmid also called the Ti (tumour inducing) plasmid, which is used widely in genetic engineering/recombinant DNA technology for creating transgenic plants or genetically modified plants.
Question 4
1 / -0

Exponential growth in plants can be expressed as

A
$$L_t = L_O + rt$$

B
$$L_e = L_t rt$$

C
$$W_1 = W_O e^{rt}$$

D
$$W_1 = W_O + e^{rt}$$

E
None of the above
Solution
- The exponential growth can be mathematically represented as follows:
$$W_1 = W_O e^{rt}$$
Here, $$W_1$$ = final size (weight, height, number etc.),
$$W_0$$ = initial size at the beginning of the period, r = growth rate, t = time of growth and e = base of natural logarithms.
Mathematically, the arithmetic growth rate can be shown as follows:
$$L_t$$ = $$L_0$$ + $$rt$$.
Here, $$L_t$$ is the length at time t, $$L_0$$ is length at time 0 and r is the rate per unit time.

Hence, option C is the answer.
Question 5
1 / -0

Indian state having highest population density is

A
Kerala

B
West Bengal

C
Maharashtra

D
Punjab

Solution

West Bengal is the state with highest population density in India. According to the 2001 census, West Bengal has a population density of 903. Total population of West Bengal (as per 2001 census) is 8,01,76,197 and its area is 88,752 sq km.
Question 6
1 / -0

World population is increasing continuously due to

A
Increased food supply

B
Increased mortality

C
Industrialisation

D
Decreased infant mortality

Solution

Overpopulation can result from an increase in births, a decline in mortality rates, an increase in immigration, or an unsustainable biome and depletion of resources.
So, the correct answer is option D.
Question 7
1 / -0

At present, growth of human population is represented in

A
Lag phase

B
Exponential phase

C
Exponential phase almost terminating stationary phase

D
Stationary phase

Solution

Population growth occurs due to the availability of enough resources. Rapid reproduction, the decline in death rates, produces a net increase in the population size. Populations tend to grow exponentially as long as there are resources available. Most populations have the potential to expand at an exponential rate since reproduction is generally a multiplicative process. Thus, the correct answer is option B.
Question 8
1 / -0

Lowest infant mortality rate in India, is in which of the following state?

A
Uttar Pradesh

B
Madhya Pradesh

C
Rajasthan

D
Kerala

Solution

There are multiple factors, which affect the size and density of the population. It includes natality, mortality, emigration and immigration.
The mortality rate is the number of deaths per thousand individuals per year. It decreases the population size and its density. It is the rate at which people die. It leads to decrease in the population. Lowest infant mortality rate in India is in Kerala. It tops the chart with just 6 deaths per 1000 live births in 2013.
So, the correct answer is option D.
Question 9
1 / -0

Rapid decline in population due to high mortality rate is

A
Population density

B
Population explosion

C
Population crash

D
All of the above

Solution

Population after reaching the upper growth limit during exponential phase, population density remains stable for some time and then declines abruptly due to decrease in food availability and increase competition. This rapid decline in population due to high mortality rate is Population crash.
So, the correct answer is option C.
Question 10
1 / -0

Information of birth rate, death rate, sex ratio, age distribution of a population can be obtained from

A
Natality table

B
Mortality table

C
Age-distribution table

D
Life table

Solution

Demographic processes such as births, deaths, immigration, and emigration, are those that affect the size and composition of a population. Life tables are tables of data on survivorship and fecundity of individuals within a population. They can then be used to determine age- or stage-specific fecundity and mortality rates, survivorship and basic reproductive rates, which in turn can be compared from cohort to cohort enabling an analysis of their annual variation.
So, the correct answer is option D.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 76

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Organisms and Populations Test - 76

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SHARING IS CARING

Question 1

58

86

85

15

40

Solution

Question 2

U.P.

Bihar

M.P.

Rajasthan

Solution

Question 3

Cyanobacterial symbiosis with some aquatic ferns

Gall formation on certain angiosperms by Agrobacterium

Nodulation of Sesbania stems by nitrogen fixing bacteria

Plant growth stimulation by phosphate solubilizing bacteria

Solution

Question 4

$$L_t = L_O + rt$$

$$L_e = L_t rt$$

$$W_1 = W_O e^{rt}$$

$$W_1 = W_O + e^{rt}$$

None of the above

Solution

Question 5

Kerala

West Bengal

Maharashtra

Punjab

Solution

Question 6

Increased food supply

Increased mortality

Industrialisation

Decreased infant mortality

Solution

Question 7

Lag phase

Exponential phase

Exponential phase almost terminating stationary phase

Stationary phase

Solution

Question 8

Uttar Pradesh

Madhya Pradesh

Rajasthan

Kerala

Solution

Question 9

Population density

Population explosion

Population crash

All of the above

Solution

Question 10

Natality table

Mortality table

Age-distribution table

Life table

Solution

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