George comes on a vacation to Indiaf rom US. The long journey disturbs his biological system and he suffers from jet lag. What is the cause of his discomfort?

George comes on a vacation to India from US. The long journey disturbs his biological system and he suffers from jet lag. What is the cause of his discomfort?

The immune system of a person is suppressed. In the Elisa test, he was found positive to a pathogen. (a) Name the disease the patient is suffering from. (b) What is the causative organism? (c) Which cells of body are affected by the pathogen?

On holidays, Rahul used to go to morning walk with his grandfather and on the way he used to collect milk from milk man for his home. One day, the milkman told dadaji that he is going to purchase a Murrah breed buffalo as he is not able to fulfill the demand of his customers to supply good quality milk. Rahul asked his grandfather following questions: (i) What are Murrah buffaloes ? (ii) What are the advantages of keeping them in dairy ?

A man started his journey on his car from location A and came back. The given graph shows his position at different times during the whole journey. (a) At what time did he start and end his journey? (b) What was the total duration of journey? (c) Which journey, forward or return, was of longer duration? (d) For how many hours did he not move? (e) At what time did he have the fastest speed?

A person is using a concave lens for his clear vision. Then he must be suffering from

A person is able to see objects clearly only when these are lying at a distance between 50 cm and 300 cm from his eye. (a) What kind of defects of vision is he suffering from ? (b) What kind of lenses are required to increases his range of vision from 25 cm to infinity ? Explain briefly.