Q17 of 44 Page 1

Write the causative agent of filariasis in human. Mention its mode of transmission and symptoms of the disease.

Wuchereria (W. bancrofti and W. malayi), the filarial worms, cause filariasis in human. Filariasis or elephantiasis is a slowly developing chronic inflammation of the organs including limbs and genitals.


Mode of transmission:


The pathogens are transmitted to a healthy person through the bite by the female mosquito vectors.


Symptoms of the disease:


a. Fever with chills


b. Skin exfoliation


c. Limb or genital swelling


More from this chapter

All 44 →
10

What is a vaccine ? How do they act to provide long term immunity to an individual who is vaccinated ?

 16

Name the specific enzyme responsible for nucleotide polymerisation in DNA replication. Write two characteristic features of this enzyme. Name the region on E. coli DNA where this enzyme can initiate replication.

 20

Name and explain the technique that helps in the separation of DNA fragments for DNA recombinant technology experiments. How can these separated DNA fragments be visualised ?

 25

(a) Explain the development of female gametophyte from a megaspore mother cell in an angiosperm.

(b) Draw a labelled diagram of a fully developed embryo sac.


OR


(a) Draw a diagrammatic sectional view of a seminiferous tubule (enlarged) of human male and label (i) Spermatogenium, (ii) Sertoli cell, (iii) Primary spermatocyte. Write the function of each labelled part.


(b) Differentiate between spermatogenesis and spermiogenesis.