Related Questions

Which of the following organisms fix nitrogen in aquatic ecosystems?
A Fungi
B Chemoautotrophs
C Cyanobacteria
D Phytoplankton
Which one of the following ecosystems covers the largest area of the earth's surface?
A Desert Ecosystem
B Grassland Ecosystem
C Mountain Ecosystem
D Marine Ecosystem
Which of the following ecosystems covers the largest area of the earth's surface ?
A Desert Ecosystem
B Mountain Ecosystem
C Fresh water Ecosystem
D Marine Ecosystem
The energy in most ecosystems comes from
A Water
B Carbon dioxide
C Sun
D Soil
When the two ecosystems overlap each other, the area is called
A Habitat
B Niche
C Ecotone
D Ecotype
What environmental issue involves the excessive use of fertilizers and run-off chemimls into bodies of water. causing oxygen depletion and harm to aquatic ecosystems?
A Acid rani
B Eutrophication
C Desertification
D Deforestation
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has
A High bond dissociation energy
B Smaller atomic radius
C Stable half filled 2p sub level
D High nuclear charge
Through nitrogen fixation process nitrogen in the atmosphere is converted into
A Ammonium
B Hydroxide
C Nitrate
D Chlorite
A person can travel from Dhaka to Faridpur in 5 different ways and then come back in any of these ways. How many different routes are possible for him to go to Faridpur and come back?
A 10
B 9
C 25
D 20
Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
A Ellipse
B Hyperbola
C Parabola
D Circle

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