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?
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.
Normal varieties of crops are prone to infection by various pathogens which lead to poor growth of crops. To get rid of existing problems, the farmers should grow improved hybrid varieties as these are mostly resistant to most pathogens and give higher yield.
Crop disease - Hybrid variety
(a) White rust - Pusa Swarnim
(b) Leaf and stripe rust - Himgiri
(c) Black rot Pusa - Shubhra
(d) Jussids Pusa - Sem 3
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