Organisms and Populations Test

Result

Organisms and Populations Test - 65

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Ammensalism is an association between two species where

A
one species is harmed and other is benefited

B
one species is harmed and other is unaffected

C
one species is benefited and other is unaffected

D
booth the species are harmed

Solution

When one species is harmed and the other is benefited, it is called parasitism. Mutualism is the case when both the species is benefited. Commensalism is the condition in which one species is benefited and another is unaffected.
So, option B is the correct answer.
Question 2
1 / -0

If in a population, natality is balanced by mortality then there will be.

A
Decrease in population growth

B
Zero population growth

C
Increase in population growth

D
Over population

Solution

The standard formula for calculating growth rate is Gr= N / t. Here, Gr is the growth rate expressed as a number of individuals. N is the total change in population size for the entire time period, also expressed as a number of individuals. Therefore if Birth= Death then N(B-D)=0 hence Gr=0/t=0.
So, the correct option is ' Zero Population Growth'
Question 3
1 / -0

During population growth curve, which phase shows maximum growth?

A
Positive acceleration phase

B
Positive phase

C
Negative acceleration phase

D
Logarithmic phase

Solution

Population growth curve is S-shaped or sigmoid growth curve. At positive acceleration phase, there are only few organisms present and the population increases at very slow rate in the beginning. It is also called as lag phase. IN logarithmic phase, the population increases at very rapid rate. It is called as log phase. The last phase is negative acceleration phase. In this, an equilibrium is attained. It is also called as stationary phase.
Thus, the correct answer is 'Logarithmic phase.'
Question 4
1 / -0

If 8 individuals in a laboratory population of 80 fruitflies died in a week, then what would be the death rate for the population for that said period?

A
8%

B
10%

C
1%

D
80%

Solution

Death rate is the number of death in a particular area in a particular time period per 1000 individual. It is calculated by total number of death divided by total number of population.
Death rate = Total number of death / total population x 1000
= 8 /80 x 1000 = `100 individuals per 1000 individuals per week.
Thus, the death rate is 10% per week.
Thus, the correct answer is '10%.'
Question 5
1 / -0

Multiple Choice Questions.
Natality is characteristic of a population which means

A
the total number of individuals present per unit area at a given time

B
the increase in number of individuals in a population under given environmental conditions

C
loss of individuals due to death in a population under given environmental conditions

D
the movement of individuals into and out of population

E
each population has three different age groups.

Solution

Natality means number of births during a given time period in a population that are added to initial density.
Increase in number of individuals in a population under given environmental conditions can be due to natality and immigration.
So the correct answer is 'increase in number of individuals in a population under given environmental conditions'.
Question 6
1 / -0

Cuscuta is an example of

A
Endoparasitism

B
Predation

C
Ectoparasitism

D
Brood parasitism.
Solution
Answer: (C) Ectoparasitism.
Explanation:
Cuscuta is a stem parasite and it grows on hedge plants.
It wraps around the host plant's stem and sucks out all the nutrients from it.
Due to this, it has lost chlorophyll during the course of evolution.
This is an example of ectoparasitism.
Hence, Cuscuta is an example of ectoparasitism.
Question 7
1 / -0

Competition results in

A
Extinction

B
Mutation

C
Larger number of niches

D
Symbiosis.
Solution
- Competition is an interaction between organisms or species in which both the organisms or species are harmed. The limited supply of at least one resource (such as food, water, and territory) used by both can be a factor.
- The specific area where an organism inhabits is called niches.
- Competitive exclusion may be avoided if one or both of the competing species evolve to use a different resource, occupy a different area of the habitat, or feed during a different time of day. The result of this kind of evolution is that two similar species use largely non-overlapping resources and thus have different niches. Hence Competition results in a larger number of niches to prevent competitive exclusion.
- So, the correct answer is ' Larger number of niches'.
Question 8
1 / -0

Multiple Choice Questions.
The formula for exponential growth is

A
dt/dN

B
dN/rN = dt

C
rN/dN = dt

D
dN/dt = rN

Solution

In exponential growth resources are unlimited so the growth pattern is geometric. and formula for it is:
dN/dt = rN where N is the population density, t is time , r is intrinsic rate.
So the correct option is "dN/dt = rN"
Question 9
1 / -0

Two species can be said to be reproductively isolated if they are

A
Infertile

B
Not infertile

C
Not growing together in a common habitat

D
Growing together in a common habitat
Solution
Reproductive isolation refers to a barrier that prevents animals of the same group from breeding. Mainly three different types of reproductive isolation are seen.
Temporal isolation: two species will never come to contact since they have different mating seasons.
Behavioral isolation: where one species does not know the mating rituals of the other
Mechanical isolation: where the organism will try to mate but are physically unable.
Ecological isolation: where two species have different habitats and are not growing together.
So the correct option is C
Question 10
1 / -0

Exaggerated dread of a disease is known as

A
Haemotophobia

B
Algophobia

C
Pathophobia

D
Myophobia

Solution

A.Haemotophobia- An abnormal and persistent fear of blood is called hematophobia.

B.Algophobia - is a phobia of pain - an abnormal and persistent fear of pain that is far more powerful than that of a normal person.

C.Pathophobia- Exaggerated dread of a disease.

D.Myophobia- phobia will wash the hands after touching any object
So, the correct answer is 'Pathophobia'.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 65

Result

Organisms and Populations Test - 65

Score

-

Rank

-

SHARING IS CARING

Question 1

one species is harmed and other is benefited

one species is harmed and other is unaffected

one species is benefited and other is unaffected

booth the species are harmed

Solution

Question 2

Decrease in population growth

Zero population growth

Increase in population growth

Over population

Solution

Question 3

Positive acceleration phase

Positive phase

Negative acceleration phase

Logarithmic phase

Solution

Question 4

8%

10%

1%

80%

Solution

Question 5

the total number of individuals present per unit area at a given time

the increase in number of individuals in a population under given environmental conditions

loss of individuals due to death in a population under given environmental conditions

the movement of individuals into and out of population

each population has three different age groups.

Solution

Question 6

Endoparasitism

Predation

Ectoparasitism

Brood parasitism.

Solution

Question 7

Extinction

Mutation

Larger number of niches

Symbiosis.

Solution

Question 8

dt/dN

dN/rN = dt

rN/dN = dt

dN/dt = rN

Solution

Question 9

Infertile

Not infertile

Not growing together in a common habitat

Growing together in a common habitat

Solution

Question 10

Haemotophobia

Algophobia

Pathophobia

Myophobia

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.