biology : class12 Red Blood Cell Stage : Causative Organism, Plasmodium, Life Cycle, Symptoms, Prevention : Malaria MCQ Questions and Answers
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Red Blood Cell Stage
MCQ questions and answers.
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MCQ Questions
1. Which Plasmodium stage enters red blood cells after being released into the bloodstream?
A.
Merozoite
B.
Ookinete
C.
Sporozoite
D.
Zygote
Correct Answer:
Merozoite
Explanation:
Merozoites invade red blood cells and begin the erythrocytic, or red blood cell, stage of the Plasmodium life cycle.
2. What is the ring-shaped stage of Plasmodium found inside a red blood cell called?
A.
Gametocyte
B.
Ring-stage trophozoite
C.
Ookinete
D.
Sporozoite
Correct Answer:
Ring-stage trophozoite
Explanation:
After entering a red blood cell, Plasmodium develops into a young trophozoite that has a characteristic ring shape.
3. What does Plasmodium mainly do inside a red blood cell during the trophozoite stage?
A.
Feeds and grows
B.
Produces eggs
C.
Forms a mosquito gut wall
D.
Moves through the salivary gland
Correct Answer:
Feeds and grows
Explanation:
During the trophozoite stage inside a red blood cell, Plasmodium obtains nutrients and increases in size.
4. Which stage develops when Plasmodium divides repeatedly inside a red blood cell?
A.
Schizont
B.
Sporozoite
C.
Ookinete
D.
Zygote
Correct Answer:
Schizont
Explanation:
A trophozoite develops into a schizont, in which repeated division produces many new merozoites inside the red blood cell.
5. What happens when a mature Plasmodium schizont inside a red blood cell ruptures?
A.
Merozoites are released
B.
Sporozoites enter the liver
C.
An ookinete forms in the stomach
D.
A zygote enters a red blood cell
Correct Answer:
Merozoites are released
Explanation:
Rupture of an infected red blood cell releases newly formed merozoites, which can invade other red blood cells.
6. The repeated invasion and rupture of red blood cells by Plasmodium is mainly associated with which symptom?
A.
Recurring fever
B.
Improved vision
C.
Increased bone growth
D.
Permanent skin coloring
Correct Answer:
Recurring fever
Explanation:
The synchronized rupture of infected red blood cells releases parasite material and is associated with recurring fever attacks in malaria.
7. Which cell is directly invaded by merozoites during the blood stage of malaria?
A.
Red blood cell
B.
Nerve cell
C.
Bone cell
D.
Skin cell
Correct Answer:
Red blood cell
Explanation:
Merozoites specifically invade red blood cells during the erythrocytic stage of Plasmodium.
8. What is the immediate result of a red blood cell being infected by Plasmodium?
A.
The parasite begins its blood-stage development
B.
The parasite becomes a mosquito egg
C.
The red blood cell becomes a liver cell
D.
The parasite forms a bacterial colony
Correct Answer:
The parasite begins its blood-stage development
Explanation:
Once inside a red blood cell, Plasmodium develops through the ring, trophozoite, and schizont stages.
9. Which sequence correctly represents the main stages of Plasmodium inside a red blood cell?
A.
Ring stage, trophozoite, schizont
B.
Sporozoite, zygote, ookinete
C.
Ookinete, gamete, sporozoite
D.
Zygote, schizont, ookinete
Correct Answer:
Ring stage, trophozoite, schizont
Explanation:
Inside red blood cells, Plasmodium develops from the ring stage into a trophozoite and then into a schizont.
10. Why can malaria cause anemia during the red blood cell stage?
A.
Many infected red blood cells rupture
B.
White blood cells become red blood cells
C.
Platelets produce excess hemoglobin
D.
The parasite stops all blood circulation
Correct Answer:
Many infected red blood cells rupture
Explanation:
Repeated rupture and destruction of infected red blood cells can reduce the number of red blood cells and contribute to anemia.
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