Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

1. Western Ghat

2. Meghalaya

3. Corbett National Park

4. Keoladeo National Park

A sedentary sea anemone gets attached to the shell lining of a hermit crab. The association is :

1. Symbiosis

2. Commensalism

3. Amensalism

4. Ectoparasitism

A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

1. 15

2. 05

3. zero

4. 10

According to Darwin, organic evolution is due to:

What type of human population is represented by the following age pyramid? 

  
1.  Stable population
2.  Declining population
3.  Expanding population
4.  Vanishing population

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

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 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