1.
Formation of ozone is
A
oxidation reaction
B
reduction reaction
C
photochemical reaction
D
thermal reaction
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Formation of ozone is
oxidation reaction
reduction reaction
photochemical reaction
thermal reaction
The layer of atmosphere containing much of ozone gas is
Troposphere
Mesosphere
Thermosphere
Stratosphere
Important abiotic factors in ecosystems include which of the following?
temperature
water
wind
all of the above
Hydrosphere includes
Animals
Soil
Plants
Water bodies
Food chain always starts with
Respiration
Transpiration
Nitrogen fixation
Photosynthesis
Example of omnivores is
Lion
Hawk
Human
Snake
Eutrophication means
thermal change in water
filling up of water body with aquatic due to extra nourishment
solid waste
none of the above
5th June is observed as
World forest day
World environment day
World wildlife day
World population day
Earthworms and bacteria are called
Producers
Consumers
Decomposers
None of these
Detritus food chain starts from
Green plants
Grass
Dead organic matter
Phytoplankton
Deforestation generally decreases
Rainfall
Soil erosion
Draught
Global warming
Conversion of ammonia to nitrite and then nitrate is called
Nitrogen fixation
De nitrification
Nitrification
Ammonification
Consumers are also called
Photoautotrophs
Saprotrophs
Heterotrophs
Reducers
Chipko movement was started to conserve
Forests
Grasslands
Deserts
Soil
Atomospheric ozone layer which protect us from UV-B & C is getting depleted most by addition of
Chloro flurocarbon
Carbon monooxide
Carbon dioxide
Sulpur dioxide
Atmosphere may extents to a height of about following kms above the earth surface
80 km
8000 km
800 km
8 km
Air pollution is caused by
Insecticides
Sewage
Smoke
Loud speakers
Afforestation is necessary for
Soil conservation
Soil erosion
Well control
Low humidity
According to Thomas Malthus human population increase in
arithmetic ratio
geometric ratio
exponension ratio
all above
71% of earth surface is covered with:
land
air
water
coal