NEB Class 12 Biology case studies

NEB Class 12 Biology · Put your knowledge to work in context.

NEB Grade 12 Biology (कक्षा १२ जीवविज्ञान) is a subject examination of the National Examinations Board (राष्ट्रिय परीक्षा बोर्ड), Sanothimi, Bhaktapur, Nepal's government examinations authority, which administers Grade 12 (कक्षा १२) papers including Biology. It is taken by students who have completed Grade 11 science study and need a Grade 12 subject result for higher study, particularly for BSc, agriculture, forestry, nursing, pharmacy, medicine and veterinary pathways. The NEB Class 12 Biology case studies are 5 cases and about 3,184 words.

Newborn Blood Groups and a Suspected Nursery Swap

At a district hospital in Nepal, two newborns were placed in the same nursery within 20 minutes of birth. Couple 1: mother group A, Rh-negative; father group O, Rh-positive.

709 words, about 4 min 2

An Oxygen Sag in a Mid-Hill Lake Receiving Sewage

A community forest users group monitors a mid-hill lake that receives untreated sewage from a growing bazaar. They sample three stations on the same morning in April: Station U (400 m upstream of the discharge), Station D (at the discharge point), and Station R (2 km downstream, after a shallow riffle).

672 words, about 3 min 3

Acid-Base Status and Ascent Decisions at 4,200 Metres

A 29-year-old trekker from Kathmandu flies to Lukla and walks to 4,200 m over three days. On the third morning she has a mild headache but no breathlessness at rest.

543 words, about 3 min 4

Failed CO2 Enrichment in a Polyhouse Tomato Crop

A commercial tomato grower in Chitwan installs CO2 enrichment in a polyhouse, raising daytime CO2 from 400 to 1,000 micromol/mol. Measurements at midday: air temperature 34 degrees C, relative humidity 35%, leaf-to-air VPD 3.4 kPa, stomatal conductance 0.12 mol m-2 s-1, leaf water potential -1.8 MPa, net photosynthesis 17 micromol m-2 s-1 (versus 18 at 400 ppm), and substantial midday wilting despite soil moisture at field capacity.

547 words, about 3 min 5

Directional Cloning with an Insert That Contains EcoRI Sites

A student lab has a 4.0 kb plasmid with a single EcoRI site at position 100, BamHI at 800, HindIII at 1,500, and XhoI at 2,700 (positions in kb from a reference point). The gene of interest is a 1.2 kb insert that contains internal EcoRI and HindIII sites but no BamHI or XhoI sites.

713 words, about 4 min