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
Which of the following is used as green manure?
Azolla
Azadirachta
Crotolaria juncea
Hevea brassiliansis
Among plants "pheromones" are secreted by the cells of the following plants for given function
all plants for growth and development
Yeast for facilitating mating
all fungi for sexual reproduction
Rhizopus for formation of zygospore
The gases that produce green house gases are
CH4, CFCs, CO2
CO2, N2O, H2
CFCs, NO2, O2
CO2, N2, water vapour
A.
CH4, CFCs, CO2
Green house effect is the CO2 effect. It is due to CO2 layer in atmosphere and also by CFCs, SO2, NO2, CH4. These gases come from factories, automobile, agriculture, refrigerators, deforestation. These gases entrap the solar heat and prevents the escape of heat from earth to outer space, thus increasing the temperature of earth which further leads to global warming.
Increase in toxic concentration from one trophic level to another trophic level is called
ecological toxification
bio- magnification
bioconcentration
cytological effect
Which of the following workers are related as ecologist, palaeobotanist and embryologist respectively?
B. Salmi, R. Mishra, P. Maheshwari
R Mishra, B. Sahni, P. Maheshwari
B. Sahni, P. Maheshwari, R Mishra
P. Maheshwari, R Mishra, B. Sahni
The Triticale is an intergeneric hybrid between
wheat and maize
maize and rye
wheat and rye
bajra and wheat
For the formation of tetrasporic embryosac, how many megaspore mother cells are required?
1
2
3
4