Name any four heart-related conditions that occur commonly in humans. Briefly explain the cause and symptoms of each of them.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Name the pathogen that causes amoebiasis in human . Given the symptoms and the mode of transmission of the disease.

Name any four non-infectious diseases and their causes.

Name any two secondary lymphoid organs in a human body and state the function of any of them.

(a) Name the Protozoan parasite that causes amoebic dysentery in humans. (b) Mention two diagnostic symptoms of the disease. (c) How is this disease transmitted to others?

Draw a schematic arrangement for winding of primary and secondary coil in a transformer when the two coils are wound on top of each other. (ii) State the underlying principle of a transformer and obtain the expression for the ratio of secondary to primary voltage in terms of the (a) number of secondary and primary windings and (b) primary and secondary currents. (iii) Write the main assumption involved in deriving the above relations. (iv) Write any two reasons due to which energy losses may occur in actul transformers.

(I) Name any two helminths which are known to the pathogenic to human. (ii) List any two symptoms of the diseases caused by any one of them.

Name the causative agent and give any one symptom of Gonorrhoea.

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