19029.Total amount of living material at the various trophic levels of a food chain is depicted by pyramids of
Numbers
Energy
Biomass
All of these
19031.Deserts, grasslands, forests and tundra are the examples of
Biomes
Biogeographical regions
Ecosystems
Biospheres
19032.Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
Goat
Frog
Sparrow
Lion
19033.Average total rainfall is 100 - 150 cm in ______, located in Australia, South America and Africa.
Tropical Savannas
Chaparrals
Deciduous forest
Temperate forest
19036.The tiny free-swimming animals on the surface of water constitute
Phytoplankton
Symbionts
Benthos
Zooplankton
19037.Organisms which break down detritus into matter particles
Herbivores
Carnivores
Detritivores
None of these
19038.Gradual and predictable changes in the species composition of a given area is
Primary succession
Ecological succession
Xerarch succession
Secondary succession
19039.The biomass available for consumption by the herbivores and the decomposers is called
Gross primary productivity
Net primary productivity
Secondary productivity
Standing crop
19040.Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?
Tertiary production
Gross production (GP)
Net production (NP)
Secondary production
19041.The species, though insignificant in number, determine the existence of many other species in a given ecosystem. Such species is known as
Keystone species
Sacred species
Endemic species
Extinct species
19043.The ecological pyramid which can be inverted in a tree eco-system is
Pyramid of Number
Pyramid of Energy
Pyramid of Biomass
both (b) and (c)
19044.Consider the following statements concerning food chains:
(a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(b) Removal of most of the carnivores resulted in an increased population of deer
(c) The length of food chains is generally limited to 3 - 4 trophic levels due to energy loss.
(d) The length of food chains may vary from 2 to 8 trophic levels.Which two of the above statements are correct?
(a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(b) Removal of most of the carnivores resulted in an increased population of deer
(c) The length of food chains is generally limited to 3 - 4 trophic levels due to energy loss.
(d) The length of food chains may vary from 2 to 8 trophic levels.Which two of the above statements are correct?
a, b
b, c
c, d
a, d
19046.DDT residues are rapidly passed through food chain causing biomagnification because DDT is
Water soluble
Lipo soluble
Moderately toxic
Non-toxic to aquatic animals