Organisms and Populations Test

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Organisms and Populations Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

The formula for the calculation of population density is
$$D=\frac{n/a}{t}$$, in this formula 'a' represents

A
Whole world population

B
Unit of time

C
Population density

D
Area of the land
Question 2
1 / -0

The eqn. $$\frac{\Delta \: N_{n}}{\Delta \: N_{t}}=B $$ represents which of the following

A
Natality

B
Growth rate

C
Mortality

D
All of these
Question 3
1 / -0

'Parasitic castration' refers to

A
Parasites induce their hosts to form antibodies

B
Parasites make their hosts to form fibrous capsules around them

C
Change brought about by the parasite on the host resulting in sexual impotency

D
None of the above

Solution
Question 4
1 / -0

Match the above and choose the correct combination from the options given below.

A
A- 1, B- 5, C- 4, D- 3, E- 2

B
A- 2, B- 1, C- 5, D- 4, E- 3

C
A- 3, B- 2, C- 1, D- 5, E- 4

D
A- 5, B- 4, C- 1, D- 2, E- 3

E
A- 1, B- 2, C- 3, D- 4, E- 5.
Solution
- Mutualism is a mutually beneficial interaction between organisms of two different species with none of the two capable of living separately. For example, Orchid Ophrys and bee pollinators.
- In commensalism, one species is benefited without the other being harmed. For example, epiphytes like mosses, ferns, orchids, etc., perched on other plants for space only to grow.
- In parasitism, one organism called parasite obtains nourishment from another organism called as host. For Example, ticks are ectoparasites on dogs.
- Competition is fighting between organisms for obtaining the same resource. For example, Balanus nearly excludes smaller barnacle Chthamalus from the intertidal area. When the Balanus population is reduced or eliminated, Chthamalus begins to flourish.
- In predation, one organism called predator that captures and eats another organism called prey. Predators are generally carnivorous animals but some herbivorous which destroy whole plants/ seeds are also called as predators. For example, birds like sparrow feeding on seeds.
Thus, the correct answer is option D.
Question 5
1 / -0

The minimum temperature in the sea is .......... , while in freshwater ponds it never goes below ..........

A
-3$$^o$$C, 0$$^o$$C

B
-10$$^o$$C, -4$$^o$$C

C
20$$^o$$C, -10$$^o$$C

D
25$$^o$$C, -100$$^o$$C

Solution

The temperature of the surface waters varies mainly with latitude. The polar seas (high latitude) can be as cold as -2 degrees Celsius (28.4 degrees Fahrenheit), while the Persian Gulf (low latitude) can be as warm as 36 degrees Celsius (96.8 degrees Fahrenheit).
Temperature varies in ponds and lakes seasonally. During the summer, the temperature can range from $$4^0$$C near the bottom to $$22^0$$C at the top. During the winter, the temperature at the bottom can be $$4^0$$C, while the top is $$0^0$$C (ice).
Thus, the correct answer is option A.
Question 6
1 / -0

Exponential growth of cell population is defined by the expression

A
$$P=4n$$

B
$$n=2P$$

C
$$P=2n$$

D
$$n=4P$$

Solution

'P' is the size of the population of cells and 'n' is the number of cycles of cell reproduction.
So the correct option is C.
Question 7
1 / -0

Exponential growth in plants can be expressed as

A
$$L_{t} = L_{o} + rt$$

B
$$L_{e} = L_{t}rt$$

C
$$W_{1} = W_{0}e^{rt}$$

D
$$W_{1} = W_{0}ert$$
Question 8
1 / -0

Alpine forests occur at altitude

A
3000-6000 m

B
2900-3000 m

C
1000-1500 m

D
500-1000 m

Solution

Alpine forests occurs at altitudes ranging between 2,900 to 3,500 m or even up-to 3800 m above sea level, depending upon the location and the variety of species.
Question 9
1 / -0

The percentage of land covered by forest in the world is

A
9-18%

B
18-27%

C
27-36%

D
More than 50%

Solution

The total land which is covered by the forests in the world is 31%. This percentage descibes the land surface covered by the forests in the world. This percentage covers about 4 billion hectares. There are many countries which show very low forests cover. South America have the largest forest cover area.
So, the correct answer is option C.
Question 10
1 / -0

If the number of a species increase in any national park it can be due to

A
Intraspecific competition

B
Interspecific competition

C
Emigration

D
Mutualism

Solution

The given situation is the example of interspecific competition. It is a type of competition where the individuals of different species compete for the resources. Intraspecific competition is an interaction in the population where the members of the same species compete for limited resources which lead to the reduction in fitness for both individuals. Members of the same species have very similar resources requirements whereas different species have a smaller contested resource overlap, resulting in intraspecific competition generally being a stronger force than interspecific competition. Individuals can compete for food, water, space, light, mates or any other resource which is required for survival. Thus, the correct answer is option B.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 72

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Organisms and Populations Test - 72

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SHARING IS CARING

Question 1

Whole world population

Unit of time

Population density

Area of the land

Question 2

Natality

Growth rate

Mortality

All of these

Question 3

Parasites induce their hosts to form antibodies

Parasites make their hosts to form fibrous capsules around them

Change brought about by the parasite on the host resulting in sexual impotency

None of the above

Solution

Question 4

A- 1, B- 5, C- 4, D- 3, E- 2

A- 2, B- 1, C- 5, D- 4, E- 3

A- 3, B- 2, C- 1, D- 5, E- 4

A- 5, B- 4, C- 1, D- 2, E- 3

A- 1, B- 2, C- 3, D- 4, E- 5.

Solution

Question 5

-3$$^o$$C, 0$$^o$$C

-10$$^o$$C, -4$$^o$$C

20$$^o$$C, -10$$^o$$C

25$$^o$$C, -100$$^o$$C

Solution

Question 6

$$P=4n$$

$$n=2P$$

$$P=2n$$

$$n=4P$$

Solution

Question 7

$$L_{t} = L_{o} + rt$$

$$L_{e} = L_{t}rt$$

$$W_{1} = W_{0}e^{rt}$$

$$W_{1} = W_{0}ert$$

Question 8

3000-6000 m

2900-3000 m

1000-1500 m

500-1000 m

Solution

Question 9

9-18%

18-27%

27-36%

More than 50%

Solution

Question 10

Intraspecific competition

Interspecific competition

Emigration

Mutualism

Solution

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