Evironment and Ecology has becoming a crucial section for the IAS Prelims Exam year after year. There is no dearth of the material for the Environment and Ecology but the candidates are required to read the full books even when most of the part are irrelevant from the point of view of IAS Prelims Exam. Even the IAS Toppers also suggest to study relevant study material for IAS Exam.
Here, we have provided Environment questions for IAS Prelims Exam which will help IAS aspirants to prepare well for the IAS Prelims Exam.
1. In every ecosystem, organisms are linked through feeding relationships. Which of the following process deals with the relationship between the number of primary producers and consumers?
Ecological pyramids are the graphic representations of trophic levels in an ecosystem. They are pyramidal in shape and they are of three types: The producers make the base of the pyramid and the subsequent tiers of the pyramid represent herbivore, carnivore and top carnivore levels. The ecological pyramid deals between the relationship with the number of primary producers and consumers (herbivores and carnivores) of different orders.
2. The main agents of transportation of seeds are:
(ii)Birds and animals
(iii)Running water and ocean current
a. (i) and (ii)
b. (i), (ii) and (iii)
c. (ii), (iii) and (iv)
d. All of the above
Seed dispersal is the movement or transport of seeds away from the parent plant. Plants have very limited mobility and consequently rely upon a variety of dispersal vectors to transport their propagules, including both abiotic and biotic vectors. The main agents of transportation of seeds are wind, birds, animals, running water, ocean currents and human beings. They transport seeds of various kinds in varying amounts in different parts of the world.
3. The network of feeding interactions is called:
In most ecosystems, feeding relationships are much more complicated than the relationships shown in a food chain. The network of feeding interactions is called a food web. Trophic levels in an ecosystem are not linear rather they are interconnected and make a food web. Thus food web is a network interconnected food chains existing in an ecosystem. One animal may be a member of several different food chains. Food webs are more realistic models of energy flow through an ecosystem
4. The sequence of energy transfer from the lower level to the higher trophic level is called
Transfer of food energy from green plants (producers) through a series of organisms with repeated eating and being eaten is called a food chain. Each step in the food chain is called trophic level. In the above example, grasses are 1st, and eagle represents the 5th trophic level.
The sequence of energy transfer from the lower level to the higher trophic level is called Food Chain e.g. a hawk eats a lizard, the lizard has just eaten a grasshopper and the grasshopper was feeding on grass blades.
5. Which of the following is correctly matched?
(a) Grasshopper (i) Primary Consumer
(b)Frog (ii) Tertiary Consumer
(c)Vulture (iii) Secondary Consumer
Primary Consumers are those which feed on green plants ( autographs) e.g- grasshopper, insects etc Secondary Consumers are those which feed a primary consumer e.g. frog, lizard etc. Tertiary consumers are those that feed on secondary consumers e.g. vulture.