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Soil Science-8

Q.1
There is no chemical control so far achieved in the field for_________.

Virus infection
Bacterial infection
Nematodes infection


Q.2
In the nitrogen cycle, the bacteria in root nodules of leguminous plants can convert atmospheric nitrogen into nitrate. These bacteria are called_________.
Nitrifying bacteria
Nitrite bacteria
Nitrogen –fixing bacteria


Q.3
Bacteria and cynobacteria are the member of the kingdom________.
Monera
Protoctista
Protophyta


Q.4
Which of the following are the characteristics of a virus?
Respiration
Growth
Reproduction


Q.5
Viruses are reproduce only_________.
At certain temperatures
Inside a living cell
In dry conditions


Q.6
Prokaryotes are usually single celled and comprise the________.
Monera kingdom
Plantae kingdom
Animalia kingdom

Q.7
This is non -living cells and non-living bio-chemical.

Virus
Bacteria
Algae


Q.8
The bacteria which oxidize reduced inorganic sulphur compounds converted to sulphate in soil.
Thiobacillus
Ferrobacillus
Nitrosomonas


Q.9
The bacteria which oxidized ammonium to nitrite in soil________.
Thiobacillus
Nitrobactor
Nitrosomonas


Q.10
The bacteria which oxidized nitrite to nitrate in soil__________.
Thiobacillus
Nitrobactor
Nitrosomonas


Q.11
True fungi are composed of filaments and masses of cells which makeup the body of the organisms, known as_______.
mycellium
sporos
filaments


Q.12
Aspirgillus is important genera of_______.
Fungi
Bacteria
Virus


Q.13
The dinitrogen (N2) fixation is performed by the enzymes_________.
Nitrogenase
Nitrodenase
Nitrofinase


Q.14
It is found to formed nodules both in roots and stems and is most important host plant for the symbiotic N 2 fixation..
Dhaicha
Guavar
Cowpea


Q.15
The anaerobic bacterium which was found responsible for an increase of the nitrogen content in soil.
Clostridium pasteurianum
Ferrobacillus
Nitrobactor


Q.16
Purity of colour denoted by___________.
Hue
Light
Chroma


Q.17
“The limiting velocity of a particle falling in fluid medium will be proportional to the square of its diameter.” This low is given by:___________.
Beer
Stoke
Lambert


Q.18
This enzyme is involved in the BNF.
Rhizobium
Azotobacter
Nitrogenase


Q.19
“Enrichment of water bodies by nutrients and consequent bloom of algal and other aquatic plants” This is the process known as:_________.
Illuviation
Elluviation
Eutrophication


Q.20
A branch of soil science which deals with the soil from the crop production point of view_________.
Pedology
Ecology
Edaphology


Q.21
In montmorillonite, most of the negative charges are developed by__________.
Dissociation of OH group
Ionic substitution
Ionic structure


Q.22
Particle density is also known as:_________.
True density
Bulk density
Aopparent density


Q.23
Total porosity is more in________.
Sandy soil
Clayey soil
Silty soil


Q.24
The dominant potential in saline soil is___________.
Metric
Osmotic
Gravitational


Q.25
The phenomenon by which hydrogen atoms act as links between water molecules is called as___________.
Polarity
Hydrogen bonding
Surface tension

Number of score out of 25 = Score in percentage =


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