Increasing accumulation of DDT in organisms of a food chain in higher trophic levels is known as
biotic potential
biotic component
biological value
biological amplification
Correct Answer :
D. biological amplification
Related Questions
Primary treatment of sewage means
encouragement of growth of microbes to decompose sewage
disinfection of sewage
removal of heavy grit from sewage in the settling chambers
pumping of sewage into aeration tanks for increased microbial activity
Which of the following functions performed by forests help most in controlling drought
Forest prevent soil erosion
Forests act as water sheds
Forests have lots of water plants
Forests bring rainfall, in monsoon
Soil particles arranged in order of increasing size are
sand-silt and clay
silt-sand and clay
clay-sand and silt
clay-silt and sand
Biologists celebrate 5th June as
Darwin's birthday
World hygiene day
World environment day
World population day
An area of soil is thoroughly wetted and allowed to drain until capillary movement of water is stopped. The water content of the soil now gives
storage water
capillary water
field capacity
gravitational water
Which one of the following is associated with the conservation of forest ?
Bharatpur
Kaziranga
Silent Valley
Gir
Mark which is true
A food chain is a chain of food consumers
A food chain is chain of food producers
A food chain is a series of organisms through which food energy flows in an ecosystem
None of the above
The first stage of plant succession on earth is called
Adaptation
Acclimatisation
Colonisation
All the above
Radiation is a health hazard as it causes
leukaemia
polio
pneumonia
haemophilia
Autumn colouration of leaves appears only in
Tropical regions
Deserts
Temperate deciduous plants
Deserts
First link in any food chain is green plant because
green plants systhesize food
the green plants eat everything
they are fixed at a place
none of these
Smog is a common pollutant in places having
excessive so2 in their air
excessive ammonia in the air
low temperature
high temperature
Vegetation in Delhi is predominantly
halophytic
mesophytic
xerophytic
hydrophytic
Deforestation may reduce the chances of
frequent cyclones
rainfall
frequent landslides
erosion of soil surface
The ultimate source of energy for fish is
Protozoa
Oxygen produced by plants
Sunlight
Manure in the soil
One of these is a renewable source of energy:
Solar energy
Hydro-power
Natural gas
All of these
In cities like Mumbai and Delhi, the major air pollutants are
ozone
carbon monoxide and oxides of sulphur
hydrocarbons and hot air
algae spores and marsh gas
Plankton, Nekton and Itenthon are not the components of one of the following ecosystems:
Marine
Freshwater
Grassland
Pond
Laterization is a process which results in the
purification of water
formation of soil
sterilization of soil
degradation of soil
Which is the correct food chain
grass � wolf > deer > buffalo
bacteria � grass � rabbit > wolf
grass � insect � bird � snake
grass > snake �insect � deer
Biosphere is:
In which individuals interact with each other
In which life originated
The name of a bird
Organic compound by which life diminih
When young plants are grazed too heavily they get killed because
the roots are starved
of the mechanical injury to roots
most of the aerial parts are eaten away
of the mechanical injury to branches
Desert plants are generally
Succulents
Heterophyllous
Herbaceous
Viviparous
Hydrilla is a
suspended hydrophyte
submerged hydrophyte
floating and anchored plant
a free floating hydrophyte
Tropical evergreen forests are seen in
Himachal Pradesh
Haryana
Tamil Nadu
Assam
The best indicator of SO^2 pollution is
Lichens
Algae
Fungus
Fems
The food chain in which microorganisms break down the energy-rich compounds synthesized by producers is
parasitic food chain
consumer food chain
detritus food chain
predator food chain
Competition for food, light and space is most severe in
closely related species growing in the same niche
closely related species growing in different habitats
distantly related species growing in same habitat
distantly related species growing in different habitats
. Biome is
the flora on land
the flora in ocean
a community of organisms interacting with each other
that part of earth and its atmosphere which inhabits living organisms
Pedology is the study of
soil
locomotion of animals
rocks
crop diseases