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
Correct Answer :
B. silt-sand and clay
Related Questions
The least porous soil among the following is
loam soil
clay soil
sandy soil
poeaty soil
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
Silent valley is situated in
Kashmir
Kerala
Africa
America
What is the major constituent of biomass of an organism
Nitrogen
Carbon
Phospnorus
Oxygen
Tropical evergreen forests are seen in
Himachal Pradesh
Haryana
Tamil Nadu
Assam
The nitrifying bacteria which oxidise nitrite to nitrates include
Nitrosomonas
Azotobacter
Nitrobacter
Closteridium
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
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
Hydrilla is a
suspended hydrophyte
submerged hydrophyte
floating and anchored plant
a free floating hydrophyte
Hie sequence blue green algae > crustose lichens � foliose lichens > mosses � shrubs � dicotyledonous tree represents
a food chain
genetic drift
ecological succession trend
a phylogenetic trend
Biosphere is:
In which individuals interact with each other
In which life originated
The name of a bird
Organic compound by which life diminih
One of these is a renewable source of energy:
Solar energy
Hydro-power
Natural gas
All of these
Which one of the following is associated with the conservation of forest ?
Bharatpur
Kaziranga
Silent Valley
Gir
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
The best indicator of SO^2 pollution is
Lichens
Algae
Fungus
Fems
The first stage of plant succession on earth is called
Adaptation
Acclimatisation
Colonisation
All the above
The ultimate source of energy for fish is
Protozoa
Oxygen produced by plants
Sunlight
Manure in the soil
Desert plants are generally
Succulents
Heterophyllous
Herbaceous
Viviparous
Deforestation may reduce the chances of
frequent cyclones
rainfall
frequent landslides
erosion of soil surface
Laterization is a process which results in the
purification of water
formation of soil
sterilization of soil
degradation of soil
Autumn colouration of leaves appears only in
Tropical regions
Deserts
Temperate deciduous plants
Deserts
Humus is an example of
soil structure
organic colloids
crystalloids
none of the above
Correct definition of ecosystem is :
A community of organisms interacting with one another
The abiotic component of a habitat
The part of the earth and its atmosphere which inhabits living organisms
The community of organisms together with environment in which they live
. 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
Radiation is a health hazard as it causes
leukaemia
polio
pneumonia
haemophilia
Pedology is the study of
soil
locomotion of animals
rocks
crop diseases
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
An American plant which had become a troublesome weed in India is
Typha latifolia
Cyperus rotundus
Parthenium
Eichhornia
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
Biologists celebrate 5th June as
Darwin's birthday
World hygiene day
World environment day
World population day