BIO 101 | 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
pseudopodia 
B
nucleus 
C
contractile vacuole 
D
general surface 
Explanation.
In Amoeba and Paramecium osmoregulation occurs through contractile vacoule. Osmoregulation is a phenomenon in which contractile vacuole plays an important role in maintaining the water balance of the cell. Paramaecium contains two contractile vacuoles which have fixed position. <br />One contractile vacuole is present near the anterior end while another is present towards posterior end of the body. Each contractile vacuole is surrounded by 5-12 radial canals. Excess of water is transferred from the cytoplasm to the radial canals. The latter pour water into the contractile vacuole. The contractile vacuole expels water outside the body. <br />Thus the contractile vacuoles and radial canals are for osmoregulation. In Amoeba the endoplasm, at its posterior end, contains a single, clear rounded and pulsating contractile vacuole, filled with a watery fluid and enclosed by a unit membrane. Surrounding this membrane is a region containing many tiny feeder vacuoles and mitochondria. It helps in the osmoregulatory and excretory activities of the animal.

Correct Option:
C
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Question 23
A
species 
B
gcr.us 
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
sexual cycle 
B
pre-crythrocytic schizogony 
C
exoerythrocytic schizogony 
D
post-erythrocytic schizogony. 
Explanation.
Plasmodium has two hosts. <br />(i) Female Anopheles mosquito: Here the sexual phase of the malaria parasite occurs and it is considered the definitive host of material parasite, (ii) Human beings: Here the asexual phase of malaria parasite occurs. It is considered as the intermediate host. Options (b), (c) and (d) are the stages of the asexual phase of Plasmodium.

Correct Option:
A
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Question 26
A
cuvier 
B
haeckel 
C
theophrastus 
D
linnaeus. 
Explanation.
The term phylum was given by Cuvier.

Correct Option:
A
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Question 27
A
class-phylum-tribe-order family- genus species 
B
di vision-class-family-tribe-order-genus- species 
C
division-class-order-family-tribe-genus- species 
D
phylum-order-class-tribe-family-genus- species 
Explanation.
To construct the hierarchy of classification, one or more species are grouped into a genus, one or more of genera into a family, families are clubbed into order, order into class, classes into phylum and various phyla into kingdom.

Correct Option:
C
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Question 28
A
Leishniania 
B
Trypanosoma 
C
A scar is 
D
Plasmodium. 
Explanation.
Plasmodium is digenetic i.e. it completes its life cycle in two hosts, asexual cycle in man and sexual cycle in Anophelesmosquito. The breeding place of this mosquito is ponds, marshes, swampy areas etc. So, if all the ponds and puddles are destroyed, Anopheles will not be able to survive leading to destruction of its parasite, Plasmodium.

Correct Option:
D
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Question 29
A
erythrocytes 
B
liver cells 
C
erythrocytes and liver cells 
D
erythrocytes, liver cells and spleen cells. 
Explanation.
Schizont stage of Plasmodium occurs in human erythrocytes and liver cells. Within the human blood the sporozoites, circulates about half an hour and enters into the liver cell. The kupffer cells of the liver clear the sporozoites from the blood stream and kill many of the organisms. A fraction of sporozoites escape destruction, however, and penetrate the hepatocytes where they take up the residence. Here they multiply by schizogony.

Correct Option:
C
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Question 30
A
binomial nomenclature 
B
theory of biogenesis 
C
discovery of microscope 
D
discovery of blood circulation. 
Explanation.
Binomial nomenclature of scientific naming was first given by C. Linnaeus (1735) in his book System a Naturae and later in Species Plantarum (1753). He used two Latin words for any organism, the first being generic name and the second is specific name. The generic name begins with capital letter and the species name with small letter.

Correct Option:
A

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