Organisms and Populations Test

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Organisms and Populations Test - 88

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Weekly Quiz Competition

Question 1
1 / -0

Few interactions are given following. How many of them are not examples of mutualism ?

A
Fungus & roots of higher plants- mycorrhiza

B
Clown fish and sea anemones

C
Cuckoo and crow

D
Orchids and bumblebees

E
Cuscuta and Hedge plants
Question 2
1 / -0

Which of these forests are found between the equator and the Tropic of Cancer?

A
Tropical

B
Temperate

C
Boreal

D
All of the above

Solution

Tropical forests are found between equator and tropic of cancer. The region between them is called tropics and ecosystem found in this area is mostly tropical rain forests, seasonal tropical forests, dry, spiny forests, deserts etc.
The tropics are divided into paleotropics and neotropics which together is called as pantropic.
So, the correct answer is 'Tropical'.
Question 3
1 / -0

They may reduce survival, growth and reproduction of host and reduce its population density. They might render organisms more vulnerable to predation by making it physically weak. They are

A
predator

B
parasite

C
Amensal

D
commensal
Question 4
1 / -0

Association of an alga with a fungus in a lichen in an example for

A
Mutual-ism

B
Commensalism

C
Neutralism

D
Parasitism

Solution

Parasitism, the relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism. The fungus grows around the bacterial or algal cells. The fungus benefits from the constant supply of food produced by the photosynthesizer.
So the above-selected option is correct.
Question 5
1 / -0

Carrying capacity for a population is estimated at 500 the population size is currently 400 and max=0.01. What is dN/dt?

A
0.01

B
0.8

C
8

D
50

Solution

The logistic population growth model is represented by :
dN/dt = rN (K-N/ K)
Here, N = Population density at time t = 400
r = Intrinsic rate of natural increase = 0.01
K = Carrying capacity = 500
So, dN/dt can be given by,
dN/ dt = 0.01 × 400 × (100/500)
dN/ dt = 0.8
So, the correct option is '0.8'
Question 6
1 / -0

Which type of interaction shows in this graph between two organism X and Y

A
Mutualism

B
Commensalism x

C
Parasitism

D
Predation

Solution

This graph shows the interaction between two species X and Y . One of the two species act as Predator and the other one act as Prey. The interaction between Predator and Prey is given by lotka-volterra equation . It is a first order non differential equation .It describes the interaction between two species in which one of the species is a Predator whereas another one species is prey . So the correct answer is ' (D) predation ' .
Question 7
1 / -0

Match the column-I with Column-II:
Column-I Column-II
(1) Cuscuta (A) Hemiparasite
(2) Lianas (B) Holoparasite
(3) Viscum (C) Commensal

A
1-C ; 2-A ; 3-B

B
1-A; 2-B; 3-C

C
1-C ; 2-B 3-A

D
1-B; 2-C; 3-A

Solution

(1) Cuscuta- B.holoparasite
(2) Lianas- C.Commensal
(3) Viscum- A.Hemiparasite
So, the correct option is '1-B, 2-C, 3-A'.
Question 8
1 / -0

Choose the incorrect one:

A
In logistic growth equation when N < K then r > 0

B
In logistic growth equation when N=K then r= constant

C
In logistic equation N > K then r <0

D
In logistic growth equation N > K then r > 0
Question 9
1 / -0

Increased IMR and decreased MMR in a population will?

A
Cause rapid increase in growth rate

B
Result in decline in growth rate

C
Not cause significant change in growth rate

D
Result in an explosive population

Solution

i) If IMR has been increased then it will result in a decline in growth rate.
ii) While decreased MMR will cause a rapid increase in growth rate.
iii) Therefore, in the above situation, if IMR has been increased and MMR has been decreased in a population, it will not cause any significant change in growth rate.

So the correct answer is option C. Not cause a significant change in growth rate.
Question 10
1 / -0

Above given graph showing interactions between two species A and B identify the interaction between them:

A
Commensalism

B
Predation

C
Competition

D
Mutualism
Solution
- In commensal interactions, one species benefits and the other is unaffected.
- As you can see in the given graph A is benefitted at the same time B is unaffected.
- Predation is an interaction in which one organism, the predator, eats all or part of the body of another organism, the prey.
- Competition is an interaction between organisms or species in which both the organisms are harmed. Competition occurs when two species each require a resource that is in short supply.
- Mutualism is an interaction between organisms or species in which both the organisms are benefitted.
So, the correct answer is option A.

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Column-I	Column-II
(1) Cuscuta	(A) Hemiparasite
(2) Lianas	(B) Holoparasite
(3) Viscum	(C) Commensal

Organisms and Populations Test - 88

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Organisms and Populations Test - 88

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Question 1

Fungus & roots of higher plants- mycorrhiza

Clown fish and sea anemones

Cuckoo and crow

Orchids and bumblebees

Cuscuta and Hedge plants

Question 2

Tropical

Temperate

Boreal

All of the above

Solution

Question 3

predator

parasite

Amensal

commensal

Question 4

Mutual-ism

Commensalism

Neutralism

Parasitism

Solution

Question 5

0.01

0.8

8

50

Solution

Question 6

Mutualism

Commensalism x

Parasitism

Predation

Solution

Question 7

1-C ; 2-A ; 3-B

1-A; 2-B; 3-C

1-C ; 2-B 3-A

1-B; 2-C; 3-A

Solution

Question 8

In logistic growth equation when N < K then r > 0

In logistic growth equation when N=K then r= constant

In logistic equation N > K then r <0

In logistic growth equation N > K then r > 0

Question 9

Cause rapid increase in growth rate

Result in decline in growth rate

Not cause significant change in growth rate

Result in an explosive population

Solution

Question 10

Commensalism

Predation

Competition

Mutualism

Solution

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