Between which of 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 Clownfish

4. Female wasp and fig species

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
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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

Subtopic:  Population Interactions: Competition |
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The formula for exponential population growth is :

1. dt/dN= rN

2. dN/rN= dt

3. rN/dN= dt

4. dN/dt= rN

Subtopic:  Population: Exponential Growth Model |
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Geometric representation of age structure is a characteristic of:

1. Biotic community

2. Population

3. Lanscape

4. Ecosystem

Subtopic:  Population Characters: Age Structure & Migration |
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A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations. A and B are twenty years apart. Select the correct interpretation about them: 
 
Interpretations

1. 'A' is more recent and shows a slight reduction in the growth rate
2. 'B' is an earlier pyramid and shows stabilised growth rate
3. 'B' is more recent showing that the population is very young
4. 'A' is the earlier pyramid and no change has occurred in the growth rate

Subtopic:  Population Characters: Density | Population Characters: Age Structure & Migration |
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The figure given below is a diagrammatic representation of the response of organisms to abiotic factors. What do (a), (b) and (c) represent, respectively? 
   

(a)

(b)

(c)

1.

Regulator

Conformer

Partial regulator

2.

Conformer

Regulator

Partial regulator

3.

Regulator

Partial regulator

Conformer

4.

Partial regulator

Regulator

Conformer

Subtopic:  Response of Organisms to Abiotic Factors |
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Study the four statements (a–d) given below and select the two correct ones out of them –
a. A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
b. Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
c. Predators ultimately lead to the extinction of prey species
d. Production of chemicals such as nicotine, strychnine by the plants are metaboilic disorders
The two correct stament are-
1. a and d
2. a and b
3. b and c
4. c and d

Subtopic:  Population Interactions: Predation |
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Which one of the following is categorized as a parasite in a true sense?
1. Human foetus developing inside the uterus draws nourishment from the mother
2. Head louse living on the human scalp as well as laying eggs on human hair
3. The cuckoo (koel) lays its eggs in a crow's nest
4. The female Anopheles bites and sucks blood from humans
Subtopic:  Population Interactions: Parasitism |
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What type of human population is represented by the following age pyramid? 

  
1.  Stable population
2.  Declining population
3.  Expanding population
4.  Vanishing population
Subtopic:  Population Characters: Age Structure & Migration |
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Consider the following four conditions (I-IV) and select the correct pair of them as an adaption to the environment in desert lizards. 
The conditions: 
I. Burrowing in soil to escape high temperature
II. Losing heat rapidly from the body during high temperature
III. Bask in the sun when the temperature is low 
IV. Insulating body due to the thick fatty dermis
 
1. (I) and (III) 2. (II) and (IV)
3. (I) and (II) 4. (III) and (IV)
Subtopic:  Adaptations |
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