Assam HS Class 11-12 Biology case studies
Assam HS Class 11-12 Biology · Put your knowledge to work in context.
The Assam Higher Secondary (HS) Biology examination is the Biology theory paper of the H.S. Final Examination, the Class 12 board examination for higher secondary students in Assam. The Assam HS Class 11-12 Biology case studies are 5 cases and about 2,744 words.
1Potato Osmosis: When Length Says 'No Change' but Mass Says Otherwise
An HS first-year practical group is studying osmosis with potato cylinders cut to 4.0 cm and blotted dry. Four cylinders of equal initial mass (2.00 g each) are placed for 30 minutes in 100 mL of distilled water, 5% sucrose, 10% sucrose, and 1.0 M sucrose.
519 words, about 3 min2Salivary Amylase: Separating pH, Temperature and Iodine Colour
During a practical on enzyme activity, students use salivary amylase to digest 1% starch. They set up tubes at pH 3, pH 7, and pH 9 using buffer, and at 20 °C, 37 °C, and 60 °C.
571 words, about 3 min3An Unaffected Sibling Asks for a Recurrence Risk
A couple, both unaffected, have two children. Their son is affected by a rare metabolic disorder confirmed to be autosomal recessive; their daughter is unaffected and is now 24 years old.
525 words, about 3 min4Primary and Booster Antibody Responses in a Child
A 10-year-old child is given a primary dose of an inactivated subunit vaccine on day 0. Blood samples show antibody titre: day 0 <1 unit, day 7 2 units, day 14 20 units, day 21 40 units, day 60 12 units, day 90 6 units.
576 words, about 3 min5A Pond, Poultry Runoff and a Fish Kill
A village pond receives runoff from a poultry farm. In week 1 the water is clear, with dissolved oxygen (DO) 8 mg/L, low algal count, and biochemical oxygen demand (BOD) 2 mg/L.
553 words, about 3 min