Short Answer TypeName the causative organism of the disease amoebiasis. List three symptoms of the disease.
Prior to a sports event blood and urine samples of sports-persons are collected for drug tests.
(a) Why is there a need to conduct such tests/
(b) Name the drugs the authorities usually look for.
(c) Write the generic names of two plants from which these drugs are obtained.
(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) Filariasis is caused by organism called Wuchereria, two principal species belonging to this category are
Wuchereria bancrofti and
Wuchereria malayi
(ii) Filarial worm remain in the body for a long time and cause chronic inflammation. They inhabit the lymphatic vessels of lower limbs resulting in the swelling of lower limbs and the disease is called elephantiasis or filariasis. Genital organ also gets affected resulting in deformities in its shape and size.
(iii) Transmission of idisease generally occurs through bite of female mosquito vectors.
A mature embryo sac in a flowering plant may possess 7-cells, but 8-nuclei. Explain with the help of a diagram only.
In an agricultural field, there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
(a) White rust (b) Leaf and stripe rust
(c) Black rot (d) Jussids
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus, improve the crop yield.
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