Q. No.Identify the A, B, C and D in the given table
Interaction
Effects on species X
Effects on species Y
Mutualism
A
(+)
B
(+)
(-)
Competition
(-)
C
D
(-)
0
A
B
C
D
1.
(+)
Parasitism
(-)
Amensalism
2.
(-)
Mutualism
(+)
Competition
3.
(+)
Competition
(0)
Mutalism
4.
(0)
Holard
(+)
Parasitism
Interaction
Effects on species X
Effects on species Y
Mutualism
A
(+)
B
(+)
(-)
Competition
(-)
C
D
(-)
0
A
B
C
D
1.
(+)
Parasitism
(-)
Amensalism
2.
(-)
Mutualism
(+)
Competition
3.
(+)
Competition
(0)
Mutalism
4.
(0)
Holard
(+)
Parasitism
Match the following and choose the correct combination from the options given below:
|
|
Column I (Interaction) |
|
Column II (Examples) |
|
I. |
Mutualism |
i) |
Trichoderma and Penicillium |
|
II. |
Commensalism |
ii) |
Balanophora, Orobanche |
|
III. |
Parasitism |
iii) |
Orchids and Ferns |
|
IV. |
Predation |
iv) |
Lichen and Mycorrhiza |
|
V. |
Amensalism |
v) |
Nepenthes and Diaonaea |
|
|
I |
II |
III |
IV |
V |
|
1. |
i |
ii |
iii |
iv |
v |
|
2. |
ii |
iii |
iv |
v |
i |
|
3. |
iii |
iv |
v |
i |
ii |
|
4. |
iv |
iii |
ii |
v |
i |
A biologist studies the population of rats in a barn.
He found that the average natality was 250, average
mortality is 240, immigration is 20 and emigration to be
30. The net increase in population is
1. 10
2. 15
3. 05
4. Zero
Mammals:
| 1. | breed many times during their lifetime and produce a small number of large-sized offspring |
| 2. | breed many times during their lifetime and produce a large number of small-sized offspring |
| 3. | breed many times during their lifetime and produce a small number of small-sized offspring |
| 4. | breed only once during their lifetime and produce a small number of large-sized offspring |
Pollination in Ophrys (a mediterranean orchid) occurs by
| 1. | Insect through clip mechanism |
| 2. | Insect through trap door mechanism |
| 3. | Insect through pseudocopulation mechanism |
| 4. | Insect through lever mechanism |
What type of human population is represented by the following age pyramid?
1. Expanding population
2. Vanishing population
3. Stable population
4. Declining population
When all Pisaster starfish were removed from an enclosed intertidal area of the American Pacific Coast, the result was:
| 1. | extinction of many invertebrate species due to interspecific competition |
| 2. | increase in number of many invertebrate species due to lack of predation |
| 3. | immigration of the Pisaster starfish returning the original conditions |
| 4. | the role of Pisater was overtaken by other species |
Carnivorous animals - lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as -
1. Character displacement
2. Altruism
3. Resource partitioning
4. Competitive exclusion
Between which among the following, the relationship is not an example of commensalism?
| 1. | Orchid and the tree on which it grows |
| 2. | Cattle Egret and grazing cattle |
| 3. | Sea Anemone and Clown fish |
| 4. | Female wasp and fig species |
What does competitive exclusion theory state?
| 1. | Two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually |
| 2. | Human beings are the most widespread agents of disturbance |
| 3. | In a competition for similar resource, both the participants are benefitted in limited resources |
| 4. | In a competition, both the participants are in state of diapouse |
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