Plasmodium

Plasmodium

Q. 1

Infective form of Plasmodium falciparum in mosquito is –

 A

Merozoites

 B

Sporozoites

 C

Gametocytes

 D

Trophozoites

Q. 1

Infective form of Plasmodium falciparum in mosquito is –

 A

Merozoites

 B

Sporozoites

 C

Gametocytes

 D

Trophozoites

Ans. C

Explanation:

Ans. is. ‘c’ i.e., Gametocytes


Q. 2

Infectious stage of plasmodium is –

 A

Trophozoite

 B

Cryptozoite

 C

Sporozoite

 D

Merozoite

Q. 2

Infectious stage of plasmodium is –

 A

Trophozoite

 B

Cryptozoite

 C

Sporozoite

 D

Merozoite

Ans. C

Explanation:

Ans. is ‘c’ i.e., Sporozoite


Q. 3

In plasmodium falciparum the number of cycles, the parasite undergoes in the liver is ‑

 A

0

 B

1

 C

2

 D

3

Q. 3

In plasmodium falciparum the number of cycles, the parasite undergoes in the liver is ‑

 A

0

 B

1

 C

2

 D

3

Ans. B

Explanation:

Ans. is ‘b’ i.e., 1

There is only pre-erythrocytic schizogony in falciparum malaria, exo-erythrocytic cycle is absent.


Q. 4

True about epidemiology of malaria – 

 A

Extrinsic incubation period 0-14 days

 B

In India common during January to June

 C

Man act as definitive host

 D

Mosquito acts as definitive host

Q. 4

True about epidemiology of malaria – 

 A

Extrinsic incubation period 0-14 days

 B

In India common during January to June

 C

Man act as definitive host

 D

Mosquito acts as definitive host

Ans. D

Explanation:

Ans. is ‘d’ i.e., Mosquito acts as definitive host 

Malaria

o Malaria is a protozoal disease caused by infection with parasite of genus plasmodium and transmitted to man by certain species of infected female Anopheline mosquito.

o Definitive host Mosquito (sexual life cycle)

o Intermediate host —> Man (Asexual cycle)

o Season In India maximum prevalence is from July to November.

o Reservoir —> With possible exception of chimpanzees in tropical Africa, which may carry the infection with P.malariae, no other animal reservoir is known to exist. Man harbouring sexual forms (gametocytes) is the only reservoir.

o Extrinsic incubation period (in mosquito) —> 10 to 20 days. It is the period of time required for the development of parasite from gametocyte to sporozoite stage (infective stage to man) in the body of mosquito.


Q. 5

Incubation period of plasmodium vivax is- 

 A

5-7 days

 B

7-10 days

 C

10-14 days

 D

15-30 days

Q. 5

Incubation period of plasmodium vivax is- 

 A

5-7 days

 B

7-10 days

 C

10-14 days

 D

15-30 days

Ans. C

Explanation:

Ans. is ‘c’ i.e., 10-14 days 


Q. 6

Malaria is transmitted in Rural areas by ‑

 A

Anopheles stephensi

 B

Anopheles dirus

 C

Anopheles culicifacies

 D

None

Q. 6

Malaria is transmitted in Rural areas by ‑

 A

Anopheles stephensi

 B

Anopheles dirus

 C

Anopheles culicifacies

 D

None

Ans. C

Explanation:

Ans. is ‘c’ i.e., Anopheles culicifacies 


Q. 7

Malaria is transmitted by –

 A

Anopheles stephensi

 B

Anopheles culicifacies

 C

Culex

 D

a and b

Q. 7

Malaria is transmitted by –

 A

Anopheles stephensi

 B

Anopheles culicifacies

 C

Culex

 D

a and b

Ans. D

Explanation:

Ans. is `a’ i.e., Anopheles stephensi; ‘b’ i.e., Anopheles culicifacies 

Also know

o The key factor in the transmission of malaria is the life span of vector.

o The vector mosquito must live for at least 10-12 days (extrinsic incubation period) after an infective blood meal to become infective.

o The strategy in malaria eradication is to shorten the life span of mosquitoes to less than 10 days.


Q. 8

Most common anopheles mosquito for malaria in India-

 A

Anopheles stephensi

 B

Anopheles subpictus

 C

Anopheles fluviatilis

 D

Anopheles dims

Q. 8

Most common anopheles mosquito for malaria in India-

 A

Anopheles stephensi

 B

Anopheles subpictus

 C

Anopheles fluviatilis

 D

Anopheles dims

Ans. A

Explanation:

Ans. is ‘a’ i.e., Anopheles stephensi 

“Anopheles stephensi is the major malaria vector in India ______________ Foundation of Community Medicine


Q. 9

True about plasmodium falciparum is:

September 2005

 A

Preferentially infects old erythrocytes only

 B

Schuffner’s dots is characteristic

 C

Crescentic macrogametocyte

 D

Large schizonts

Q. 9

True about plasmodium falciparum is:

September 2005

 A

Preferentially infects old erythrocytes only

 B

Schuffner’s dots is characteristic

 C

Crescentic macrogametocyte

 D

Large schizonts

Ans. C

Explanation:

Ans. C: Crescentic macrogametocyte

Plasmodium falciparum preferentially infects young erythrocytes, but can infect all stages.

Schizonts are small, compact and seldom seen in peripheral smear.

Macrogametocytes are crescentic with deep blue cytoplasm and compact nucleus.

In falciparum malaria, parasitized erythrocytes may be sequestered in tissue capillaries resulting in a falsely low parasite count in the peripheral blood (‘visible’ parasitemia).

In such instances, the developmental stages of the parasite seen on blood smear may help to assess disease severity better than parasite count alone. The presence of more mature parasite forms (>20% of parasites as late trophozoites and schizonts) and of more than 5% of neutrophils containing malarial pigment indicates more advanced disease and a worse prognosis. One negative blood smear makes the diagnosis of malaria very unlikely (especially the severe form); however, smears should be repeated every 6-12 hours for 48 hours if malaria is still suspected


Q. 10

Band forms are evident at what stage of the plasmodium malariae life cycle?

 A

Trophozoite

 B

Schizont

 C

Male gametocyte

 D

Female gametocyte

Q. 10

Band forms are evident at what stage of the plasmodium malariae life cycle?

 A

Trophozoite

 B

Schizont

 C

Male gametocyte

 D

Female gametocyte

Ans. A

Explanation:

Ans. is ‘a’ i.e., Trophozoite


Q. 11

The spike of fever in malaria is at the time of release of ‑

 A

Sporozoites

 B

Hypnozoites

 C

Merozoites

 D

None

Q. 11

The spike of fever in malaria is at the time of release of ‑

 A

Sporozoites

 B

Hypnozoites

 C

Merozoites

 D

None

Ans. C

Explanation:

Ans. is ‘c i.e., Merozoites 



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