Which hypothesis was proposed by Paul Ehrlich to suggest the importance of species richness in the maintenance of ecosystems?

Match the fish species given in List - I with their type of food habits in pond in List - II.

Select the correct answer using the codes given below:

Which of the following is an artificial ecosystem?

Environmental Impact Assessment (EIA) involves several stages, and each stage is equally important in determining the overall performance of a project. Arrange the following stages in the correct chronological order:

1. Scoping

2. Impact Analysis

3. Screening

4. Mitigation

​____________ is the phenomenon of movement of a species from its own habitat to some other habitat for a particular time period every year for a specific purpose like breeding. ​

Which of the following organisms can initiate ecological succession even in bare rocks?

What is a population (or subspecies or race) that is adapted to local environmentalconditions called? 

Who mentioned ecosystem as 'the basic unit in ecology' in 1956?

In a forest ecosystem of Grass → Impala → Hyena, if all the Hyena are taken away, what will happen ultimately?

The increased concentration of suspended solids in water and their accumulation onbottoms where they are undesirable, creates what kind of water pollution?