Question

Identify the correct sequence of stages in Ross cycle of Plasmodium (a) Sporocyst (b) Ookinete (c)Sporozoite (d) Zygote (e) Oocyst

• A. $d\to b-a-e-c$
• B. c-a-e-b-d
• C. $d\to e\to b\to a\to c$
• D. $d\to b\to e\to a\to c$

Answer 1

Answer: (D)

$d\to b\to e\to a\to c$

• The correct sequence of stages in the Ross cycle of Plasmodium is :
• When a mosquito bites an infected human, it ingests the gametocytes, which develop further into mature sex cells called gametes.
• The fertilized female gametes, the zygote develops into actively moving ookinetes that burrow through the mosquito's midgut wall and form oocysts on the exterior surface.
• Inside the oocyst, thousands of active sporozoites develop. The oocyst eventually bursts, releasing sporozoites into the body cavity that travel to the mosquito's salivary glands.
• Hence, the correct sequence of stages in the Ross cycle of Plasmodium is zygote, ookinete, oocysts, sporocyst and sporozoite.
• So, the correct answer is 'd-> b -> e -> a -> c.