441.
Harmful activity of Blue green algae is A
Denirification
B
Water - bloom
C
Increase alkalinity of soil
D
Decrease fertility of soil
Answer :
Water - bloom
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442.
Early blight of potato is caused by A
Alternaria
B
Albugo
C
Rhizopus
D
Puccinia
Answer :
Alternaria
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443.
Tailed bacteriophage are A
Motile on the surface of bacteria
B
Actively motile in liquid water
C
Motile on the surface of its host
D
None motile
Answer :
None motile
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444.
Which part of a virus enters into its host A
Envelope
B
Capsid
C
Nucleic acid
D
All together
Answer :
Nucleic acid
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445.
Who studies sexual recombination is cynabacteria A
P.K. De
B
R.N. Singh
C
Leder berg
D
H.D. Kumar
Answer :
H.D. Kumar
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446.
Entomophagous fungi is A
Collatotrium
B
Cercospora
C
Dactyllela
D
Rhizopus
Answer :
Dactyllela
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447.
The diatomaceous earth is sued for insulting boilers and steam pipes because A
The diatomaceous earth is very cheap
B
It is a good conductor of heat
C
It is a bad conductor of heat
D
It is composed of calcium carbonate
Answer :
It is a bad conductor of heat
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448.
Which character favour nonliving nature of virus A
Absence of RNA
B
Absence of nucleous
C
Abiotic state
D
Ability of reversible crystallization
Answer :
Ability of reversible crystallization
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449.
The organisms participating most actively in nitrogen cycle in nature are A
Bacteria
B
Lengumes
C
Parasitic algae
D
Fungi
Answer :
Bacteria
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450.
The causal organism for African sleeping sickness is A
Trypanosoma cruzi
B
T. rhodesiense
C
T. tangela
D
T. gambiense
Answer :
T. gambiense
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African sleeping sickness disease also called trypanosomiasis, that is common in Africa which is caused by parasite, Trypanosoma gambiense. The parasite is transmitted by Tse-Tse fly (Glossina palpalis).