Name the toxin responsible for the appearance of symptoms of malaria in humans. Why do these symptoms occur periodically?

Write down symptoms of malaria.

Shievering and high fever are the common symptoms of malaria in humans. Explain the cause of these symptoms.

Name some symptoms of viral diseases.

Name the hormone responsible for the descent of testes into the scrotum. Why does the failure of the process result in sterlity ?

What are the symptoms of phosphorus deficient plant? Where do these symptoms first appear in a plant?

Name the group of viruses responsible for causing AIDS in humans. Why are these viruses so named?

Why do some metals occur in native state ?