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Malaria questions in NEET look easy until they ask where fertilisation happens, which stage the mosquito injects, or what haemozoin does. The answers come from one diagram in NCERT, and the stage names come from a slightly longer version of the same cycle. This post walks through both hosts in order, then tests it with a worked question.
What does the syllabus include?
Unit 8 of the NEET (UG) 2026 syllabus lists "Health and Disease; Pathogens; parasites causing human diseases (Malaria, Filariasis, ...)". The source chapter is Human Health and Disease in NCERT Class 12 Biology (2026-27 reprint), whose Figure 7.1 shows the stages of the Plasmodium life cycle. Check the syllabus for your exam year.
Why does malaria still matter?
The WHO malaria fact sheet estimates 282 million malaria cases and 610,000 deaths worldwide in 2024. It lists five Plasmodium species that cause malaria in humans, with *P. falciparum* and *P. vivax* posing the greatest threat. *P. falciparum* is the deadliest, and *P. vivax* is the dominant species in most countries outside sub-Saharan Africa.
NCERT names three species, *P. vivax*, *P. malariae* and *P. falciparum* (it prints the second as "P. malaria"), and calls the disease caused by *P. falciparum* malignant malaria, the most serious form, which can be fatal.
What happens inside the human?
Following NCERT, with stage names from the US CDC's DPDx malaria page:
An infected female Anopheles mosquito bites and injects sporozoites, the infectious form.
The sporozoites reach the liver, where they multiply inside liver cells. CDC describes them maturing into schizonts that burst and release merozoites.
Merozoites invade red blood cells and multiply again. The red blood cells rupture and release more merozoites.
NCERT links the rupture of red blood cells to the release of a toxic substance, haemozoin, responsible for the chill and high fever "recurring every three to four days".
Some parasites in red blood cells become male and female gametocytes, the sexual stage.
CDC adds that in *P. vivax* and *P. ovale*, a dormant liver stage called the hypnozoite can wake weeks or years later and cause a relapse.
What happens inside the mosquito?
A female Anopheles bites an infected person and takes up gametocytes with the blood.
In the mosquito's stomach, male gametes fertilise female gametes to form a zygote.
The zygote becomes a mobile ookinete, which goes into the gut wall and forms an oocyst.
The oocyst bursts and releases sporozoites, which move to the salivary glands.
When this mosquito bites a person, the cycle starts again.
So the parasite needs two hosts. Multiplication without fertilisation happens in the human; fertilisation happens in the mosquito. CDC describes humans as the parasite's intermediate host. NCERT points out that the female Anopheles is also the vector, the transmitting agent.
Worked example: true or false?
Mark each statement and give the reason.
"Male Anopheles mosquitoes inject sporozoites." False. NCERT names the infected female Anopheles as the one that bites and transmits.
"Fertilisation in Plasmodium happens in human red blood cells." False. Gametocytes form in red blood cells, but gametes fuse in the mosquito's stomach.
"Haemozoin is released when infected red blood cells rupture." True, and NCERT links it to the chills and fever.
"Sporozoites are stored in the mosquito's salivary glands." True.
Put in order: oocyst, sporozoite in liver, gametocyte, merozoite, ookinete. Answer: sporozoite in liver, merozoite, gametocyte, ookinete, oocyst.
How is malaria prevented?
NCERT's control measures focus on the vector: avoid stagnant water near homes, clean household coolers regularly, use mosquito nets, fit wire mesh on doors and windows, spray insecticides in ditches and swamps, and introduce fish such as Gambusia, which eat mosquito larvae, into ponds.
The WHO fact sheet notes that early symptoms are fever, headache and chills, usually starting 10 to 15 days after an infective bite. Anyone with a fever after mosquito exposure should see a doctor and get tested.
Which mistakes cost marks?
Calling Anopheles the pathogen. Plasmodium, a protozoan, is the pathogen; the mosquito is the vector.
Placing fertilisation in humans. Only gametocytes form there.
Mixing up mosquitoes. NCERT links dengue and chikungunya to Aedes, not Anopheles.
Confusing haemozoin with haemoglobin.
Copying "P. malaria". The species name is *Plasmodium malariae*.
For the rest of the chapter, see our guide to human health, immunity and vaccines. For how the mosquito link was found, read about Ronald Ross's work in India.
If a stage name keeps slipping, Fermi's Concept Library covers every concept in physics, chemistry, biology, mathematics and computing, so you can look it up without leaving your revision.
A practice routine
Draw the cycle from memory as two loops, human and mosquito, with every stage named.
Check your drawing against NCERT Figure 7.1 and mark anything you missed.
Write ten true-or-false statements like the ones above and swap them with a friend.
Revise the prevention measures as a list of five.
Repeat the drawing after three days and again after a week.
Today, close this page and draw the two loops from memory in under five minutes.
