12th Grade > Biology
BIOLOGICAL CLASSIFICATION MCQs
Total Questions : 39
| Page 4 of 4 pages
Answer: Option D. -> Monerans and fungi
:
D
Most of themonerans and fungi are decomposers i.e., that is biotic component of ecosystem
:
D
Most of themonerans and fungi are decomposers i.e., that is biotic component of ecosystem
Answer: Option D. -> Mode of nutrition
:
D
Whittaker's system of classification is based on complexity of cell structure and mode of nutrition.
:
D
Whittaker's system of classification is based on complexity of cell structure and mode of nutrition.
Answer: Option C. -> They have indestructible wall layer deposited with silica
:
C
Inchrsophytes,the cell walls form two thin overlapping shells, which fit together as in a soap box. The walls are embedded with silica and thus, the walls are indestructible.
:
C
Inchrsophytes,the cell walls form two thin overlapping shells, which fit together as in a soap box. The walls are embedded with silica and thus, the walls are indestructible.
Answer: Option A. -> Monera
:
A
Monerans have the maximum nutritional diversity as some of them are - autotrophs - can prepare their own food (eg. Cyanobacteria),heterotrophs - depend on others for food (eg. Escherichia coli),saprophytes - feed on dead and decaying matter,parasitic - live on other host cells for survival and cause,symbiotic - in mutual relation with other organisms (eg. Anabaena ),commensalism - it is where one organism is benefited and the other is not affected (eg. Salmonella),mutualism - where both the organisms are benefited.
:
A
Monerans have the maximum nutritional diversity as some of them are - autotrophs - can prepare their own food (eg. Cyanobacteria),heterotrophs - depend on others for food (eg. Escherichia coli),saprophytes - feed on dead and decaying matter,parasitic - live on other host cells for survival and cause,symbiotic - in mutual relation with other organisms (eg. Anabaena ),commensalism - it is where one organism is benefited and the other is not affected (eg. Salmonella),mutualism - where both the organisms are benefited.
Answer: Option C. -> Mycoplasmas
:
C
Mycoplasmais a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.
:
C
Mycoplasmais a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.
Answer: Option B. -> 32 X 105 cells
:
B
The time taken by a bacterium to divide is calledgeneration time (G) or doubling time,since each parent cell divides into two daughter cells.
In this particular culture, the doubling time is 35 minutes. We are asked what will be cell concentration after 175 min.
Given,thegeneration time Gis 35 min.The total time elapsed (t)=175 min.
Then the cells would have divided or doubled 5 times (175/35=5), in this period. This means n=5 (wheren is the number of generations).
After one doubling, a single cell would become 2 cells. In the second generation, these 2 cells would double to 4 cells and so on.
This gives a simple formula= 2n. Given that n=5, then 25=32.
This calculation, assumes that the starting culture contained a single cell.
In the problem, we are informed that the culture contained an initial cell concentration of 105cells/mL.
Therefore, the final cell concentration after 175 min should be 105X 32 cells/mL.
:
B
The time taken by a bacterium to divide is calledgeneration time (G) or doubling time,since each parent cell divides into two daughter cells.
In this particular culture, the doubling time is 35 minutes. We are asked what will be cell concentration after 175 min.
Given,thegeneration time Gis 35 min.The total time elapsed (t)=175 min.
Then the cells would have divided or doubled 5 times (175/35=5), in this period. This means n=5 (wheren is the number of generations).
After one doubling, a single cell would become 2 cells. In the second generation, these 2 cells would double to 4 cells and so on.
This gives a simple formula= 2n. Given that n=5, then 25=32.
This calculation, assumes that the starting culture contained a single cell.
In the problem, we are informed that the culture contained an initial cell concentration of 105cells/mL.
Therefore, the final cell concentration after 175 min should be 105X 32 cells/mL.
Answer: Option D. -> TMV contains dsRNA
:
D
The plant viruses –Tobamo viruses(tobacco mosaic virus) tomato mosaic virus;Potex viruses (potato virus X, papaya mosaic virus); yellow mosaic virus, tobacco necrosis virus, alpha mosaic virus; satellite tobacco necrosis virus and some animal viruses –Togaviurs,Picornaviruses (Polivirus), etc., contain single stranded RNA.
:
D
The plant viruses –Tobamo viruses(tobacco mosaic virus) tomato mosaic virus;Potex viruses (potato virus X, papaya mosaic virus); yellow mosaic virus, tobacco necrosis virus, alpha mosaic virus; satellite tobacco necrosis virus and some animal viruses –Togaviurs,Picornaviruses (Polivirus), etc., contain single stranded RNA.
Answer: Option C. -> Crystal violet
:
C
Primary stain used is crystal violet.Crystal violet stains all thecells blue/purple.
:
C
Primary stain used is crystal violet.Crystal violet stains all thecells blue/purple.
Answer: Option D. -> Symbiosis – Lichens
:
D
Symbiosis - association between two organisms where both get benefited. Lichens are symbioticassociation between algae and fungi.
:
D
Symbiosis - association between two organisms where both get benefited. Lichens are symbioticassociation between algae and fungi.
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