Organisms and P...

Which of the following pairs contributes to an increase in population?

Organisms that can tolerate a wide range of salt concentration are termed as 

Study the characteristics of a population represented in the graphs below.
Mark the correct graph that represents the type of selection that this population is likely to undergo.
_____ : Past
.......... : Future

Which of the following representation shows the pyramid of numbers in a forest ecosystem?

Desert, rain forest, tundra, etc, are examples of 

Certain characteristic demographic features of developing countries are

In the given figure, identity the temperate forest and coniferous forest respectively from the marking A-F and select the correct option. 

Which of these interactions has negative effects?
(i) Predation
(ii) Mutualism
(iii) Commensalism
(iv) Parasitism

Study the four statements (i - iv) given below and select the two correct ones out of them.
(i) A lion eating a deer and a sparrow feeding on grains are ecologically similar in being consumers.
(ii) Predator star fish helps in maintaining species diversity of some invertebrates.
(iii) Predators ultimately lead to the extinction of prey species.
(iv) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders.
The two correct statements are

The fitness of individuals with different phenotypes of the same trait differs in two different situations P and Q. P and Q respectively indicate