a) Producers2. Which of the following group of gases cause photochemical smog?
b) Tertiary Consumers
c) Secondary consumers
e) Primary consumers
a) Ozone, PAN and CO3. Which of the following statements regarding species interdependence are true?
b) HC, NO and PAN
c) O2, PAN, and NO2
d) O2, PAN and NO2 (e) O3, PAN and NO2
A) An association of two species where one is benefitted and other remains unaffected called mutualism
B) An interspecific association where both partners derive benefit from each other is called commensalism
C) A direct food relation between two species of animals in which one animals kills and feed on another is referred as predation
D) A relationship between two species of organism where both the partners are benefitted from each other is called symbiosis.
a) A and B only4. The species of plants that play a vital role in controlling the relative abundance of other species in a community are called
b) C and D only
c) A and C only
d) B and C only
e) B and D only
a) Edge species5. Habitat loss and fragmentation, over exploitation, alien species invasion and co extinction are causes for
b) Link species
c) Pioneer species
d) Successional species
e) Keystone species
a) Population exploitation6. The formula of growth rate for population in given time is
d) Ecological succession
e) Biodiversity loss
a) dt/dN=rN7. One greenhouse gas contributes 14% to total global warming and another contributes 6%. These are respectively identified as
a) N2O and CO28. Which of the following is false?
b) CFCs and N2O
c) Methane and CO2
d) Methane and CFCs
e) CFCs and CO2
a) Quantity of biomass in a trophic level at a particular period is called as standing crop9. Many freshwater animals cannot live for long in sea water and vice versa mainly because of the
b) The energy content in a trophic level is determined is determined by considering a few individuals of a species in that trophic level.
c) The succession that occurs in newly cooled lava is called primary succession
d) Rate of succession is faster in secondary succession
e) phytoplanktons are the pioneers in the aquatic ecosystem
a) Change in N levels10. Which of the following regarding ecological pyramids is not correct?
b) Change in the levels of thermal tolerance
c) Variations in light intensity
d) Osmotic problems
e) Spectral quality of solar radiation
a) In most ecosystems, the pyramid of numbers and biomass are up rightAnswers
b) In tree dominated ecosystem the pyramid of numbers is inverted
c) The pyramid of energy expresses mainly the rate of food production
d) In deep water ecosystem, the pyramid of biomass is upright
e) The total energy flow at successive tropical level always decreases
1. a) Producers
2. e) O3, PAN and NO2
3. b) C and D only
4. e) Keystone species
5. e) Biodiversity loss
6. d) dN/dt=rN
7. b) CFCs and N2O
8. b) The energy content in a trophic level is determined is determined by considering a few individuals of a species in that trophic level.
9. d) Osmotic problems
10. a) In most ecosystems, the pyramid of numbers and biomass are up right