Organisms and Populations Test

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Organisms and Populations Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

A high density elephant population in an area will result in ______________.

A
Mutualism

B
Predation on one another

C
Interspecific competition

D
Intraspecific competition
Question 2
1 / -0

Maximum growth rate occurs in

A
Stationary phase

B
Lag phase

C
Exponential phase

D
Senescent phase
Solution
Correct option: C
Explanation:
The growth curve of any population shows 4 phases- lag, exponential, stationary, and senescent phase.
The exponential phase is where the growth is maximum and increases.
It is the period where food is abundant in the population and no competition.
The lag phase is also called the preparatory phase in which cells prepare themselves to divide.
In the stationary phase, the number of cells formed is equal to the number of cells being destroyed.
The senescent phase is where the number of cells getting destroyed is greater than the number of cells formed.
Hence, the maximum growth rate occurs in the "Exponential phase".
Question 3
1 / -0

Choose the correct option of alphabets for phases in accompanying growth curve

A
a-rapid growth, b-diminishing growth, c-stationary, d-slow growth

B
a-slow growth, b-exponential growth, c-diminishing growth, d-stationary

C
a-stationary, b-slow growth, c-rapid growth, d-diminishing growth

D
a-diminishing growth, b-exponential growth, c-slow growth, d-stationary growth

Solution

The graph is called Growth curve. The graphical representation of growth as a function of time is called Growth curve. It is used in statistics to determine the type of growth pattern quantity is it linear, exponential or cubic. Its shows three phases, Lag phase, Log phase and Stationary phase.
So, the correct option is ‘a-slow growth, b-exponential growth, c-diminishing growth, d-stationary’.
Question 4
1 / -0

For food, light and space, the greatest competition is between two

A
Closely related species of the same niche

B
Closely related species of the different niches

C
Unrelated species of the same niches

D
Unrelated species of the different niches
Question 5
1 / -0

There is more competition for survival between

A
Different animals for same niche

B
Same animals of same niche

C
Different animals of different niche

D
Same animals of different niche
Question 6
1 / -0

A cuckoo laying eggs in the nest of other species of birds is an example of

A
Adelphoparasitism

B
Broodparasitism

C
Ectoparasitism

D
Hyperparasitism

Solution

Cuckoo clock is the bird in which has the habit of laying their eggs only in the nests of other species of birds. This is known as Blood parasitism.
So the correct option is B.
Question 7
1 / -0

Many of the bacteria living in the human large intestine feeding on undigested food without harming the host are

A
Predators

B
Commensals

C
Symbionts

D
Parasites

Solution

When bacteria feed on undigested food, they neither harm nor benefit the organism. Apart from this, the bacteria get nutrition from this undigested food and thus they are benefited. So, the bacteria are said to be commensals as they depict the population interaction 'commensalism'.
So, option B is the correct answer.
Question 8
1 / -0

Which statements regarding response of organisms to abiotic factors in false?

A
All birds and mammals are capable of thermoregulation.

B
Majority of animals and nearly all plants cannot maintain a constant internal environment.

C
Shivering is a kind of exercise which produces heat and raises body temperature.

D
Very small animals are commonly found in polar regions as they have to spend less energy to generate heat.

E
Diapause is a stage of suspended development seen in zooplankton.
Solution
- The majority of animals cannot regulate their body temperature with the change in environment.
- Thermoregulation is expensive for most of the organisms, especially smaller organisms.
- As heat gain and loss depend on the surface area, small animals have more surface area relative to volume, so they lose more body heat.
- This is why small animals are hardly found in polar regions.
- Shivering is a kind of exercise which produces heat and raises body temperature.
- Diapause is a stage of suspended development seen in zooplankton.
- So, the correct answer is option D.
Question 9
1 / -0

A permanent loss from population can be due to

A
Immigration

B
Emigration

C
Migration

D
All of the above

Solution

When a particular number of individuals of a species move out of the species, it is called emigration. When the same number of species migrate into a particular area, it is called immigration. As a result of emigration, a particular number of individuals move out permanently and as a result, it is permanent loss of population.
So, option B is the correct answer.
Question 10
1 / -0

In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during year. Using exponential equation, the number of people present in 2015 is predicted as:
Using exponential equation, the number of people present in 2015 is predicted as:

A
25 millions

B
17 millions

C
20 millions

D
18 millions
Solution
- The exponential equation for population growth is given by :
N_t =N₀ e^rt
Here, Nt = Population after time t
No = Initial population.
r = growth rate = b-d = 0.028-0.008 = 0.02
t = time difference = 10 years.
Applying it to the given equation,
Nt = 14 × e^ 0.02*10
Nt = 14 × 1.22 = 17 millions.

So, the correct option is '17 millions'.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 45

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Organisms and Populations Test - 45

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SHARING IS CARING

Question 1

Mutualism

Predation on one another

Interspecific competition

Intraspecific competition

Question 2

Stationary phase

Lag phase

Exponential phase

Senescent phase

Solution

Question 3

a-rapid growth, b-diminishing growth, c-stationary, d-slow growth

a-slow growth, b-exponential growth, c-diminishing growth, d-stationary

a-stationary, b-slow growth, c-rapid growth, d-diminishing growth

a-diminishing growth, b-exponential growth, c-slow growth, d-stationary growth

Solution

Question 4

Closely related species of the same niche

Closely related species of the different niches

Unrelated species of the same niches

Unrelated species of the different niches

Question 5

Different animals for same niche

Same animals of same niche

Different animals of different niche

Same animals of different niche

Question 6

Adelphoparasitism

Broodparasitism

Ectoparasitism

Hyperparasitism

Solution

Question 7

Predators

Commensals

Symbionts

Parasites

Solution

Question 8

All birds and mammals are capable of thermoregulation.

Majority of animals and nearly all plants cannot maintain a constant internal environment.

Shivering is a kind of exercise which produces heat and raises body temperature.

Very small animals are commonly found in polar regions as they have to spend less energy to generate heat.

Diapause is a stage of suspended development seen in zooplankton.

Solution

Question 9

Immigration

Emigration

Migration

All of the above

Solution

Question 10

25 millions

17 millions

20 millions

18 millions

Solution

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