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.
Differentiate between benign and malignant tumors.
| Benign tumors | Malignant tumors |
| Benign tumors are those tumors that remain confined to their original location and do not spread. | Malignant tumors are those which invade the surrounding cells and travel to distant sites along with blood and start a new tumor where they get lodged. |
| Slow and cause less damage. | Rapid action and causes more damage. |
(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.
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