Q18 of 30 Page 1

Name the bacterium that causes typhoid. Mention two diagnostic symptoms. How is this disease transmitted to others?

Typhoid is caused by Salmonella typhi.

Symptoms:


a. Sustained high fever (39° to 40°C),


b. Stomach pain with constipation


It is transmitted to others by through food and water contaminated with them and migrate to other organs through blood.


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16

(a) Mention the cause and the body system affected by ADA deficiency in humans.

(b) Name the vector used for transferring ADA-DNA into the recipient cells in humans. Name the recipient cells.


 17

How did Ahmed Khan, plastic sacks manufacturer from Bangalore, solve the ever-increasing problem of accumulating plastic waste?

 19

(a) Explain the phenomena of multiple allelism and co-dominance taking ABO blood group as an example.

(b) What is the phenotype of the following:


(i) IAi


(ii) ii


 20

How does industrial melanism support Darwin’s theory of Natural selection? Explain.