Q23 of 30 Page 1

(i) Write the scientific names of the two species of filarial worms causing filariasis.

(ii) How do they affect the body of infected person(s)?


(iii) How does the disease spread?


i) Scientific names of filarial worms are:-

a) Wuchereria bancrofti


b) Loa loa


ii) They affect the body by causing severe swelling in an arm, leg, breast or the genital area. The skin of the affected area becomes susceptible to bacterial infection. The skin could become scaly, swelled, thickened and hard.


iii) The disease spreads through the cysts which are spread through faeco-oral route.


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(a) Name the part of the plant used as explant by the scientists.


(b) Describe the procedure the scientists followed to recover the healthy plants.


(c) Name the technology used for crop improvement.


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(i) Name the enzyme that catalyses the transcription of hnRNA.

(ii) Why does the hnRNA need to undergo changes? List the changes hnRNA undergoes and where in the cell such changes take place.


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Name the genus to which baculoviruses belong. Describe their role in the integrated pest management programmes.

 25

Unambiguous, universal and degenerate are some of the terms used for the genetic code. Explain the salient features of each one of them.