621.
A Semi parasite relationship between the algal and fungal components of a lichen is termed as A
Helotism
B
Epiphytism
C
Parasitism
D
Predation
Answer :
Helotism
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622.
Aflatoxin is produced by A
A virus
B
Aspergillus flavus
C
Agaricus
D
An algae
Answer :
Aspergillus flavus
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623.
What is true for cyanobacteria? A
Oxygenic with nitrogenase
B
Oxygenic without nitrogenase
C
Non-oxygenic with nitrogen
D
Non-oxygenic without nitrogenase
Answer :
Oxygenic with nitrogenase
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Cyanobacteria are oxygenic photoautotroph. Many members perform nitrogen fixation.
624.
Which one of the following statements is wrong? A
Cyanobacteria are also called blue-green algae
B
Golden algae are also called desmids
C
Eubacteria are also called false bacteria
D
Phycomycetes are also called algal fungi
Answer :
Eubacteria are also called false bacteria
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Eubacteria are the true bacteria.Notes : Eubacteria are prokaryotic organisms, as characterized by the lack of a membraneenclosed nucleus, predominantly unicellular, with DNA in single circular chromosome, and have peptidoglycan on cell wall when present. They include most of the familiar bacteria of medical and economic importance such as E. coli.
625.
In which of the following endomitosis take place in Amoeba A
Binary fission
B
Sporulation
C
Multiple fission
D
Rejuvenation
Answer :
Sporulation
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626.
What is common about Trypanosoma, Noctiluca, Monocystis and Giardia? A
They have flagella
B
They produce spores
C
These are all parasites
D
These are all unicellular protists
Answer :
These are all unicellular protists
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Trypanosoma, Noctiluca, Monocystis & Giardia are unicellular protists i.e. unicellular eukaryotes.
627.
Sex factor in bacteria is A
Chromosomal replicon
B
F-replicon
C
RNA
D
Sex-pilus
Answer :
F-replicon
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Sex-factor or F-factor in bacteria results in high frequency conjugation. It allows bacteria to produce sex pilus necessary for conjugation.
628.
Artificial system of classification was first used by A
Linnaeus
B
De Candolle
C
Pliny the Elder
D
Bentham and Hooker
Answer :
Pliny the Elder
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During the early period in taxonomy, only external morphology (the characters observable with naked eye) were the sole criteria to classify plants and animals. Theophrastus gave names and description of 480 plants in his book “Historia plantarum”, on the basis of their habit but Pliny the Elder introduced first artificial system of classification in his book Historia Naturalis. He classified both plants and animals.
629.
The badidiomycetes includes A
Rusts
B
Smuts
C
Mushrooms
D
All of the above
Answer :
Mushrooms
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630.
Which is not present in prokaryotes A
Ribosome
B
Mitochondria
C
Cytoplasm
D
Mesosome
Answer :
Mitochondria
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