What will happen if our water resources are continued to be polluted by industrial wastes
Sufficient food will not be available to water organisms
Sufficient oxygen will not be available to water organisms
Drinking water will not be available
B.O.D value of water will decrease
Correct Answer :
B. Sufficient oxygen will not be available to water organisms
Related Questions
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
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
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
The least porous soil among the following is
loam soil
clay soil
sandy soil
poeaty soil
The source of energy in the ecosystem is:
decomposition of animals and plants by bacteria
photosynthesis by green plants
fermentation of sugars
sun-light
Vegetation in Delhi is predominantly
halophytic
mesophytic
xerophytic
hydrophytic
Autumn colouration of leaves appears only in
Tropical regions
Deserts
Temperate deciduous plants
Deserts
Which of the following is normally not at atmospheric pollutant
CO
Hydrocarbons
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
A habitat of long severe winters and growing season limited to a few months of summer constitutes
Taiga ecosystem
Tundra ecosystem
Savannah ecosystem
Tropical rainforest
Plankton, Nekton and Itenthon are not the components of one of the following ecosystems:
Marine
Freshwater
Grassland
Pond
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
The first stage of plant succession on earth is called
Adaptation
Acclimatisation
Colonisation
All the above
Which one of the following is associated with the conservation of forest ?
Bharatpur
Kaziranga
Silent Valley
Gir
Water plants usually have
a well developed root system
a well developed vascular system
a well developed stomatal system
a reduced vascular system
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
Silent valley is situated in
Kashmir
Kerala
Africa
America
Tropical evergreen forests are seen in
Himachal Pradesh
Haryana
Tamil Nadu
Assam
Carbon cycle includes
producer - consumer - decomposer
decomposer - consumer - producer
producer - decomposer - consumer
consumer - producer - decomposer
Desert plants are generally
Succulents
Heterophyllous
Herbaceous
Viviparous
The nitrifying bacteria which oxidise nitrite to nitrates include
Nitrosomonas
Azotobacter
Nitrobacter
Closteridium
Radiation is a health hazard as it causes
leukaemia
polio
pneumonia
haemophilia
The biggest herbarium of India is
Botanical Survey of India - Calcutta
St. Xavier's Herbarium - Mumbai
Central National Herbarium - Calcutta
IARI - New Delhi
Which is the correct food chain
grass � wolf > deer > buffalo
bacteria � grass � rabbit > wolf
grass � insect � bird � snake
grass > snake �insect � deer
Hie earliest settlers on barren lands are generally
Diatoms
Lichens
Mosses
Ferns
Commensalism is
when both organisms are benefited
when one organism is benefited without affecting the other
when one organism is affected
when both organisms are affected
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
What is the major constituent of biomass of an organism
Nitrogen
Carbon
Phospnorus
Oxygen
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