Zoology Q52 – AP-EAMCET 2025

Home Zoology Human Health and DiseaseQuestion #18

Match the following

\begin{array}{lcl} Parasites & Infective stages to man \\ A) Entamoeba histolytia & I) Sporozoite \\ B) Plasmodium vivax & II) 3rd stage microfilaria \\ C) Ascaris lumbricoides & III) 2nd stage rhabditiform larva \\ D) Wuchereria bancrofti & IV) Tetranucleate cyst \\ V) Gametocyte \end{array}

Clue 1 of 3: Parasite Life Cycles

Understanding the life cycle of common human parasites is crucial to identify their infective stages.

🧠 Full Solution Path

Step 1: Identify the Infective Stage for Entamoeba histolytica✦ Active

$E n t a m o e b a h i s t o l y t i c a$ is an intestinal parasite that causes amoebiasis. The infective stage for humans is the mature quadrinucleate (tetranucleate) cyst, which is ingested through contaminated food or water.

Therefore, A matches with IV.

Step 2: Identify the Infective Stage for Plasmodium vivax○ Expand

$P l a s m o d i u m v i v a x$ is the causative agent of malaria. Humans get infected when an infected female $A n o p h e l e s$ mosquito bites them and injects $s p o r o z o i t e s$ into the bloodstream.

Therefore, B matches with I.

Step 3: Identify the Infective Stage for Ascaris lumbricoides○ Expand

$A s c a r i s l u m b r i c o i d e s$ is a large intestinal roundworm. Humans become infected by ingesting embryonated eggs containing the second-stage rhabditiform larva, usually through contaminated soil or food.

Therefore, C matches with III.

Step 4: Identify the Infective Stage for Wuchereria bancrofti○ Expand

$W u c h e r e r i a b a n c r o f t i$ is a filarial nematode that causes lymphatic filariasis. Humans are infected when an infected mosquito (e.g., $C u l e x$ , $A n o p h e l e s$ , $A e d e s$ ) bites them and transmits the third-stage filariform larvae (microfilaria).

Therefore, D matches with II.

Step 5: Combine the Matches and Select the Correct Option○ Expand

Based on the individual matches, the correct combination is: A - IV, B - I, C - III, D - II.

Comparing this combination with the given options, Option 3 matches perfectly.

💡 Teacher's Secret Hint

Always double-check all individual matches before selecting the final option to avoid errors.

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Zoology Question 52 – AP-EAMCET 2025

Clue 1 of 3: Parasite Life Cycles

🧠 Full Solution Path