The driving force of an ecosystem is :
producers
biomass
solar energy
grassland
C.
solar energy
The driving force of an ecosystem is the solar energy which is obtained from sun, and is trapped by green plants for conversion into chemical energy. Only 10% of the energy is transferred from one trophic level to the next trophic level and rest of the energy is used up in biological activity and gets wasted in the environment.
The correct match of atmospheric gases is :
Nitrogen - 0.03%; Oxygen - 78.08%; Argon - 0.93%; CO2 - 20.95%
Nitrogen - 78.08%; Oxygen - 20.95%; Argon - 0.03%; CO2 - 0.03%
Nitrogen - 0.03%; Oxygen - 78.08%; Argon - 20.95%; CO2 - 0.93%
Nitrogen - 78.08%; Oxygen - 20.95%; Argon - 0.93%; CO2 - 0.03%
Evolutionary convergence is characterized by:
development of characteristics by random mating
replacement of common characteristic in different related groups
development of dissimilar characteristics in closely related groups
development of a common set of characteristics in groups of different ancestry
Allopatric speciation is due to :
geographical separation of population
hybridization between closely related species
migration of the members of a species from one to other population
both (b) and (c)
Darwin finches are related to which of the following evidences ?
Fossils
Embryology
Anatomy
Geographical distribution
The pioneers in the field of 'organic evolution' are:
Karl Landsteiner, Hugo de Vries, Malthus
Darwin, Hugo de Vries, Lamarck, Huxley
Lamarck, Karl Landsteiner, Malthus, Hugo de Vries
Darwin, Lamarck, Karl Landsteiner, Hugo de Vries
What is a key stone species ?
A rare species that has minimal impact on biomass and on other species in community
A dominant species that constitutes a large proportion of biomass, which affects many other species
A common species that has plenty of biomass, yet has a fairly low impact on the community's organization
A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival
Prototherians are the connecting links between:
amphibians and aves
reptiles and mammals
fishes and amphibians
reptiles and amphibinas
