Lichen is the pioneer vegetation on which succession?
Hydrosere
Lithosere
Psammosere
Xerosere
B.
Lithosere
Lithosere is a type of xerosere originating on bare rock surfaces. The original substratum is deficient in water and lacks any organic matter having only minerals in disintegrated state. The pioneer vegetaion is therfore, lichens.
Hydrosere originates in a pond with the colonization of some phytoplanktons which form the pioneer plant community.
Which of the following is used as green manure?
Azolla
Azadirachta
Crotolaria juncea
Hevea brassiliansis
Nitrifying bacteria are able to
convert atmospheric nitrogen into soluble forms
convert ammonia to nitrate
ammonia to nitrogen
nitrate to nitrogen
Green plants constitute
first trophic level
second trophic level
third trophic level
complete food chain
The presence of diversity at the junction of territories of two different habitats is known as
bottleneck effect
edge effect
junction effect
Pasteur effect
Gases found in primitive atmosphere are
CH4, NH3, H2, H2O (vapour form)
CH4, NH3, CO2, H2O
CH4, H2O, CO2
CH4, O2, CO2
Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as
antibiosis
commensalism
predation
parasitism
the group of Anamniota includes
reptiles and birds
birds and mammals
fishes an amphibians
reptiles and mammals
If decomposers are removed what will happen to the ecosystem?
Energy cycle is stopped
Mineral cycle is stopped
Consumers cannot absorb solar energy
Rate of decompostion of mineral increases
The effect of intraspecific competition on niches is to make them
smaller
larger
change location
more triangular
