Biology · General Awareness

Disease Vectors and Pathogens

820 Questions

Disease vectors and pathogens examine how organisms like Plasmodium and Leishmania transmit infections. Test items require matching vectors to specific diseases. Studying these life cycles is essential for scoring well.

Plasmodium infective stagesDisease transmission modesDisease vectors and fleasIntracellular parasitesElephantiasis causes

Disease Vectors and Pathogens Questions

Multiple choice

The protective effect against malaria is related to

  1. HbF

  2. HbH

  3. HbS

  4. HbM

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

HbS (sickle hemoglobin) confers protection against Plasmodium falciparum malaria. The parasite cannot easily infect sickle cells due to reduced oxygen tension and premature cell destruction. This heterozygote advantage maintains the sickle gene in malaria-endemic regions.

Multiple choice

Schuffner's dots observed in erythrocytes are due to which of the following?

  1. Giardiasis

  2. Filariasis

  3. Malaria

  4. Kala-azar

  5. Laryngitis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Schüffner's dots refers to a hematological finding that is associated with malaria, exclusively found in Plasmodium ovale and Plasmodium vivax. Plasmodium vivax induces morphologic alterations in infected host erythrocytes that are visible by light microscopy in Romanovsky-stained blood smears as multiple brick-red dots.

Multiple choice

Directions: Read the following passage and answer the question that follows.

We have learned throughout that tigers and sharks are dangerous animals. We are also scared of them because they are big and powerful. However, as we get older we learn that sometimes the most dangerous animals are also the tiniest animals. In fact, the mosquito is the animal that kills many people every year and is probably the most dangerous. It may seem that all mosquitoes are biters, but this is not actually the case. Male mosquitoes eat plant nectar. On the other hand, female mosquitoes feed on animal blood. They need this blood to live and produce eggs. When a female mosquito bites a human being, it transmits a small amount of saliva into the blood. This saliva may or may not contain a deadly disease. The result of the bite can be as minor as an itchy bump or as serious as death by a disease like malaria and yellow fever. Although mosquitoes may not seem as scary as larger, more powerful animals, they are far more dangerous to human beings.

Male mosquitoes eat

  1. dead animals

  2. cow dung

  3. plant nectar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The line "Male mosquitoes eat plant nectar" suggests the answer.

Multiple choice

Directions: Read the following passage and answer the question that follows.

We have learned throughout that tigers and sharks are dangerous animals. We are also scared of them because they are big and powerful. However, as we get older we learn that sometimes the most dangerous animals are also the tiniest animals. In fact, the mosquito is the animal that kills many people every year and is probably the most dangerous. It may seem that all mosquitoes are biters, but this is not actually the case. Male mosquitoes eat plant nectar. On the other hand, female mosquitoes feed on animal blood. They need this blood to live and produce eggs. When a female mosquito bites a human being, it transmits a small amount of saliva into the blood. This saliva may or may not contain a deadly disease. The result of the bite can be as minor as an itchy bump or as serious as death by a disease like malaria and yellow fever. Although mosquitoes may not seem as scary as larger, more powerful animals, they are far more dangerous to human beings.

The deadliest animal that we face in our daily life is the

  1. tiger

  2. lion

  3. mosquito
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The line "...the mosquito is the animal that kills the most people every year and is probably the most dangerous" suggests the answer.

Multiple choice

Which of the following organisms is carrier of Plasmodium vivax?

  1. Virus

  2. Amoeba

  3. Anopheles

  4. None

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The female Anopheles mosquito is the biological vector or carrier that transmits Plasmodium vivax, the parasite causing one type of malaria. The mosquito picks up the parasite from an infected human and injects it into a healthy person during feeding.