221.
Plasmid are A
Virus
B
New types of micro organism
C
Extra chromosomal genetic material of bacteria
D
Essential bacterial genetic materials
Answer :
Extra chromosomal genetic material of bacteria
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222.
A good green manure in rice fields is A
Aspergillus
B
Azolla
C
Salvinia
D
Mucor
Answer :
Azolla
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Aspergillus is a fungus, Mucor is also a fungus. Azolla harbors blue-green algae Anabaena which fixes $${N_2},$$ increasing fertility.Notes : Azolla is unique because it is one of the fastest growing plants on the planet – yet it does not need any soil to grow. Unlike almost all other plants, Azolla is able to get its nitrogen fertilizer directly from the atmosphere. Azolla is able to do this because it has a unique mutually beneficial ‘symbiotic relationship’ with a cyanobacterium (blue-green alga) called Anabaena.
223.
Mucor mucedo is a A
Homothallic fungus
B
Heterothallic fungus
C
Heteroecius fungus
D
None of the above
Answer :
Heterothallic fungus
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224.
Professor Nanda and Professor Ranjan are known for their contribution in A
Plant embryology
B
Plant physiology
C
Pathlogy
D
Breeding
Answer :
Plant physiology
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225.
Lichens are ecologically important because A
They are associted with mycorrhizal roots
B
They are association of algae and fungi
C
They are pioneers (earliest settlers on barren rocks) and pass xeric conditions successfully
D
They can grow in greatly polluted area
Answer :
They are pioneers (earliest settlers on barren rocks) and pass xeric conditions successfully
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226.
Membrane-bound organelles are absent in: A
Saccharomyces
B
Streptococcus
C
Chlamydomonas
D
Plasmodium
Answer :
Streptococcus
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Membrane bound organelles are absent in Streptococcus. It is a bacterium that is included under kingdom Monera. Monerans are prokaryotes which lack membrane bound organelles like mitochondria, E.R, Golgi e.t.c. Saccharomyces, Chlamydomonas and Plasmodium are eukaryotes that have membrane bound organelles.
227.
Pyorrhoea is aggravated by A
Entamoeba hastmanni
B
Entamoeba coli
C
Entamoeba histolytica
D
Entamoeba gingivalis
Answer :
Entamoeba gingivalis
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228.
Which of the following sets of conditions favour rapid spread of white rust disease A
High temperature + High humidity
B
Low temperature + High Humidity
C
High temperature + Low humidity
D
Low temperature + Low humidity
Answer :
Low temperature + High Humidity
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229.
What is the agent of transformation is bacteria A
DNA
B
RNA
C
Protein
D
Murein
Answer :
DNA
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230.
Life cycle of Saccharomyces cerevissae is A
Haplonitc
B
Diplontic
C
Haplo-diplonitc
D
Diplo-haplontic
Answer :
Haplo-diplonitc
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