The pioneer species in xerarch and hydrarch succession are respectively
Lichens and sedges
Phytoplanktons and sedges
Lichens and zooplanktons
Lichens and phytoplanktons
Lichens and phytoplanktons
D.
Lichens and phytoplanktons
Xerarch succession - plant succession starting bare ground or rock, pioneer species are lichens and mosses.
Hydrarch succession - starts from the fresh water (pond or lake) and reaches to the wood land stage, phytoplanktons are the pioneer species.
The gross primary productivity of an ecosystem is 170 tons organic matter and amount used in respiration is 50 tons. Calculate the net primary productivity of the ecosystem.
120 tons
100 tons
70 tons
12 tons
12 tons
The rate of biomass production and the rate of production of organic matter during photosynthesis are called respectively
Total productivity, primary production
Gross primary productivity, gross secondary productivity
Net primary productivity, secondary productivity
Net productivity, gross secondary productivity
Net productivity, gross secondary productivity
Identify the ecologist from the given hints
(i) Has carried out long-term ecosystem experiments using outdoor plots
(ii) In his experiments he showed that increased diversity contributed to higher productivity
Ahmed Khan
David Tilman
Stanley Choen
Ernest Chain
Ernest Chain
Which of the following ecological pyramids is generally inverted?
Pyramid of energy
Pyramid of biomass in a forest
Pyramid of biomass in a sea
Pyramid of numbers in grassland
