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Where will you look for the sporozoites of the malaria parasites?
(a) The saliva of the infected female Anopheles mosquito.
(b) Red Blood Corpuscles of the human suffering from malaria.
(c) The spleen of the infected human.
(d) Salivary glands of trashy molted female Anopheles mosquito.

Answer
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Hint: When an infected person is bitten, Plasmodium which is the parasite responsible for causing malaria enters the mosquito's body and undergoes further development. The parasites multiply within them to form sporozoites.

Complete answer
We know that when an infected female Anopheles mosquito bites a healthy human being Plasmodium enters as sporozoites. The mature infective stages of the malarial parasite which are transferred from mosquito to man are known as sporozoites. During the process, the nucleus of the oocysts divides first by meiosis and subsequently by mitosis, which forms a large number of small haploid nuclei, as well as large vacuoles, were developed at the same time. Those tiny nuclei and cytoplasmic masses form elongated and spindle-shaped bodies which are called sporozoites. From each oocyst, about 1,000 sporozoites were produced. When the mature oocysts rupture, the tiny elongated sporozoites are liberated into the hemocoel of the mosquito. The sporozoites are motile. They can move to different organs in the body cavity of the mosquito. But many of them penetrate the salivary glands of the mosquito and store in their saliva. When the female Anopheles mosquito bites a healthy person, those sporozoites are injected into that person’s blood along with saliva. These sporozoites start their cycle again in the human body.

Additional information:
1) The malaria parasite life cycle involves two hosts. During the blood meal, an infected female Anopheles mosquito inoculates sporozoites into the human host. After that sporozoites infect liver cells of that human being and mature into schizonts, which finally rupture and release merozoites.
2) Plasmodia are protozoa. Only the species Plasmodium falciparum, P. vivax, P. malariae, and P. ovale are usually infectious for humans. Of these, P. falciparum is the most dangerous.
3) The malaria disease shows up in three successive stages. The first is a 15 to 60 minute i.e the cold stage which is characterized by shivering and a feeling of cold. In the next stage, a 2-6 hour hot stage, in which there is a fever, sometimes reaching 41°C, flushed, dry skin, and often a headache, nausea, and vomiting. Finally, in the 3rd stage, there is a 2-4 hour sweating stage during which the fever drops rapidly, and the patient sweats.
So, the correct answer is sporozoites are found in, ’(a) The saliva of the infected female Anopheles mosquito.’.

Note: Malaria can be life-threatening, it causes high fever, chills, and flu-like symptoms as well as nausea, vomiting, and diarrhea. Besides malaria may also cause anemia and jaundice (yellow coloring of the skin and eyes) because of the loss of red blood cells. If not properly treated in time, the infection can become severe and may cause kidney failure, seizures, mental confusion, coma, and death.