RBSE SS Biology case studies
RBSE SS Biology · Put your knowledge to work in context.
The RBSE Senior Secondary Biology examination is the Class 12 biology paper set by the Rajasthan Board of Secondary Education (BSER), also called the Board of Secondary Education, Rajasthan. It is taken by students completing senior secondary schooling in Rajasthan and is used for board certification, eligibility for undergraduate science and biology-linked courses, and as a baseline for competitive entrance examinations. The RBSE SS Biology case studies are 5 cases and about 4,456 words.
1Two group-O children of a group-AB father: paternity, cis-AB or Bombay phenotype?
A couple from a town near Jaipur is referred for genetic counselling. The father's red cells are agglutinated by both anti-A and anti-B sera; his serum agglutinates A cells and B cells but not his own.
687 words, about 3 min2Polyuria after head injury: diabetes insipidus, diabetes mellitus or primary polydipsia?
A 24-year-old man is admitted after three weeks of passing 7-9 L of urine a day and drinking constantly, including at night. Six months earlier he had a road accident with a base-of-skull fracture.
786 words, about 4 min3Two chlorosis patterns in one tomato field on calcareous soil
An 8-hectare tomato field near Jodhpur is irrigated with tube-well water of pH 8.4 that is high in bicarbonate. The farmer applies 120 kg N, 60 kg P2O5 and 40 kg K2O per hectare as urea, DAP and muriate of potash, plus well-rotted farmyard manure, but no micronutrient fertiliser.
967 words, about 5 min4Fish kill at dawn in a sewage-fed lake
A 40-hectare lake on the edge of Jaipur receives untreated municipal sewage through a drain entering at the northern shore. Monitoring in May, when water temperature is 31 degrees Celsius, gives: total phosphorus 1.2 mg/L and total ammonia 3.5 mg/L at the inlet; BOD5 of 22 mg/L at the inlet, 6 mg/L two kilometres downstream and 1.5 mg/L at an upstream reference point; chlorophyll-a 180 micrograms/L in the lake; dissolved oxygen 12 mg/L at 16:00 and 1.7 mg/L at 05:30 near the inlet.
951 words, about 5 min5Pink bollworm surviving Cry1Ac cotton: resistance, refuges and verification
A cotton-growing block in Rajasthan has grown Bt cotton carrying only Cry1Ac on 92% of its area for eight seasons. The non-Bt refuge area required by the approval conditions has never exceeded a tenth of the stipulated area, and the refuge is routinely sprayed with the same insecticides used on the Bt crop.
1,065 words, about 5 min