Photochemical smog formed in congested metropolitan cities mainly consists of
ozone, peroxyacyl nitrate and NOx
smoke, peroxyacyl nitrate and SO2
hydrocarbons, SO2 and CO2
hydrocarbons, ozone and SO2
A.
ozone, peroxyacyl nitrate and NOx
Photochemical smog is a grey or yellowish brown opaque smog having oxidizing environment but little smokes. It is formed at high temperature over cities and towns due to still air, emission of NO2 oxides and hydrocarbons from automobile exhausts. Nitrogen dioxide splits into nitric oxide and nascent oxygen. Nascent oxygen combines with molecular oxygen to form ozone. Ozone reacts with hydrocarbons to form aldehydes and ketones. Nitrogen oxides, oxygen and ketones combine to form peroxy-acyl-nitrates (PAN).
One out of the following is not responsible for biodiversity loss
Alien species invasion
Co-extinction
Ex-situ conservation
Deforestation
Assertion: A mangrove tree growing in marshy place has pneumatophores.
Reason: Pneumatophores help in better anchorage to marshy soil.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Which of the following statements is not true
The biodiversity decreases with increasing latitude.
The biodiversity decreases with increasing altitude.
The fishes show greatest biodiversity among vertebrates.
The biodiversity of bryophytes is greater than that of angiosperms
Which of the following options consist of nonessential amino acids only
Valine, leucine, glycine, alanine
Glycine, serine, proline, glutamic acid
Proline, aspartic acid, glutamic acid, methionine
Cysteine, tyrosine, alanine, isoleucine
Assertion: There are 34 biodiversity hotspots in the world.
Reason: High level of species richness is a criteria for selection of a biodiversity hotspot.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
Assertion :Now-a-days, the biodiversity is declining with an accelerated rate.
Reason : Exotic species are considered to be a major cause of extinction of species.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following is best method of germplasm conservation
Herbarium
Botanical garden
Seed bank
Zoological park
