BIO 102 | Study Mode

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Question 21
A
Plasmodium vivax transmitted by Tsetse fly
B
Trypanosoma lewsii transmitted by Bed Bug
C
Trypanosoma gambiense transmitted by Glossina palpalis
D
Entamoeba gingivalis spread by Housefly.
Explanation
Trypanosoma gambiense is the parasitic zoo flagellate which causes one of the deadliest ailments in human beings called sleeping sickness or trypanosomiasis. The disease is common in humid and subhumid zones of the African continent. The disease is transmitted by shade loving tsetse fly (Glossinapalpalis) which acts as the vehicle that carries the culprit protozoan parasite.

Correct option: C
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Question 22
A
eating balanced food
B
eating plenty of fruits
C
drinking boiled water
D
using mosquito nets.
Explanation
Amoebiasis can be prevented by drinking boiled water as it mainly occurs by ingestion of cysts of E. histolytica in food or drinks. The contamination of food or drinks occurs by (i) unhygienic habits of food handlers who by habit scratch the anus and then put the fingers in the food which they serve, (ii) habit of defecating in open fields causing contamination of vegetables and then washing the bottom in ponds causing the contamination of water, (iii) transmission of cysts from stools to food and drinks by flies and cockroaches. So, one should take following preventive measures:

(I) Proper sanitation of roads, streets, lanes and open drains.

(II) Purification of drinking water (by boiling).

(III) Proper disposal of sewage.

(IV) Covering of the food articles by the traders.

(V) Chemical trcatent of huma faeces to be used as fertilizer.


Correct option: C
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Question 23
A
species
B
genius
C
order
D
taxon.
Explanation
A taxon (plural taxa) or taxonomic unit, is a name designating an organism or group of organisms. A taxon is assigned a rank and can be placed at a particular level in a systematic hierarchy reflecting evolutionary relationships.

Correct option: D
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Question 24
A
resemblances in morphology
B
anatomical and physiological traits
C
breeding habits
D
presence or absence of notochord.
Explanation
Taxonomy and classification are a part of the broader field of systematics which is the study of diversity of organisms. Classification of a part of systematics as it lists the unique characters of each taxon.

Correct option: B
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Question 25
A
de Candolle
B
Linnaeus
C
Theophrastus
D
Darwin.
Explanation
Linnaeus, 1758 developed Binomial system of nomenclature, de Candolle gave the term taxonomy. Theophrastus, father of botany, gave names and descriptions of 480 plants in his book. Histuria plantarum and Darwin proposed the theory of natural selection or origin of species.

Correct option: C
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Question 26
A
Bentham and Hooker
B
Linnaeus
C
Julian Huxley
D
A.P. de Candolle.
Explanation
The term New Systematics was given by Julian Huxley (1940). This classification takes into account the cytological, morphological, genetical, anatomical, palynological and physiological characters.

Correct option: C
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Question 27
A
artificial
B
natural J U.
C
phylogenetic
D
numerical.
Explanation
Classification given by Bentham and Hooker is Natural System. Monocots were placed after dicots; closely related families were seperated; gymnosperms were placed between dicots and monocots.

Correct option: B
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Question 28
A
Ronald Ross
B
Mendel
C
Laveran
D
Stephens.
Explanation
Laveran discovered that malaria is caused by protozoan parasite (Plasmodium) in 1880. He discovered Plasmodium and got Nobel Prize in 1907.

Sir Ronald Ross in 1897, a doctor in Indian Army, established that malaria parasite is transmitted by the bite of a female Anopheles mosquito and in 1902; he got Nobel Prize for this discovery.


Correct option: C
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Question 29
A
single stranded RNA
B
double stranded DNA
C
proteinaceous
D
double stranded RNA.
Explanation
Tobacco Mosaic Virus is a ribovirus and contains single stranded RNA. It was proved by the experiments ofFrankel Conart that RNA is the genetic material in this virus. It does not contain any DNA and is composed of 6 % RNA surrounded by a hollow cylinder of portion subunits.

Double stranded RNA is found in Reovirus and Tumor virus.

Retroviruses have two copies of single stranded RNA.


Correct option: A
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Question 30
A
motile on surface of bacteria
B
non-motile
C
motile on surface of plant leaves
D
actively motile in water.
Explanation
The tailed bacteriophages contain a hollow helical tail which serves both as cell attachment organ and as a tube that facilitates the entry of nucleic acid into the host cell. The tail consists of tail plate and the caudal fibres.

Correct option: A

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