A thalasemic child needed repeated blood transfusions, got infected by HIV.
(i) use a rough diagramatic sketch and arrows to show how the virus increased in number.
(ii) Why did the increased number of HIV viruses deteriorate the child's immunity?
(iii) Which diagnostic test showed that the infective virus was HIV?

A thallasemic child needed repeated blood transfusions got infected by HIV. Use a rough diagrammatic sketch and arrows to show how the virus increased in number.

A thallasemic child needed repeated bloodd transfusions got infected by HIV. Which diagnositic test showed that the infective virus was HIV?

A thallasemic child needed repeated bloodd transfusions got infected by HIV. Why did the increased number of the HIV virus deteriorate the child's immunity?

Immuno - deficiencies are the diseases which occur due to impaired immune responses. These immuno - deficiencies may be primary or secondary. AIDS is a secondary immunodeficiency caused by a retrovirus Human Immunodeficiency Virus (HIV). Following diagram is that of HIV. Observe the diagram and answer the questions listed below the diagram : (i) State one difference primary immunodeficiency and secondary immunodeficiency. (ii) Why is HIV called a retrovirus? (iii) Identify the parts of the diagram labelled as A and B.

The given bar graph shows the number of identical articles sold by 5 different stores A, B, C, D and E during a particular month. Study the bar graph and answer the following questions : (i) Which store sold the largest number of articles ? (ii) By what per cent is the sale of store D more than that of store B ? (iii) Find the ratio of the total sale of the two highest selling stores to the total sale of the two least selling stores. (iv) By how much must store E increase its sale to catch up with its nearest rival store ?