Q18 of 30 Page 1

Write the names of causal organisms of the following:

a) Typhoid


b) Pneumonia


c) Elephantiatis (Filariasis)


d) Amoebiasis


OR


Expand the following:


a) AIDS


b) ELISA


(a) Typhoid is caused by the pathogenic bacterium Salmonella typhi.


(b) Pneumonia is caused by bacteria like Streptococcus pneumoniae and Haemophillus influenza.


(c) Elephantiasis (Filariasis) is caused by filarial worm Wuchereria.


(d) Amoebiasis or amoebic dysentery is called by protozoan parasite Entamoeba histolytica.


OR


(a) AIDS stands for Acquired Immuno Deficiency Syndrome. AIDS is caused by HIV.


(b) ELISA stands for Enzyme Linked Immuno-Sorbent Assay. It is a widely used diagnostic test for AIDS.


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16

DDT content in the water of a lake that supplies drinking water to the nearby villages is found to be 0.004 ppm. The pelicans of that area are reported to have 2.6 ppm of DDT. Why has the concentration increased in these birds? What possible harm will this cause to the bird population? Name the phenomenon.

 17

The gradual and predictable change in the species composition of a given area is called ecological succession. What do you understand with the pioneer and climax community in this context?

 19

Study the graph given above showing the levels of ovarian hormones during menstruation and correlate the uterine events that take place according to the hormonal levels on:


(i) 6-15 days


(ii) 16 - 25 days


(iii) 26 - 28 days (if the ovum is not fertilized)


 20

Expand the following and explain any one of them.

a) IVF


b) ZIFT


c) IUI


d) MTP