Biology 9700/21 Oct Nov 2014 | Cambridge AS Level Past Papers With Mark Scheme

1. Small intestine cell structure functions, mitochondrial abundance in cell B, and goblet cells’ mucus production role in gas exchange.

2. Immunity types: active, passive, natural, and artificial; smallpox eradication factors and global vaccination program impacts.

3. Formation of dipeptides through condensation reactions, primary structure of angiotensin, and pressure regulation in pulmonary circulation.

4. Chromosomal behavior across mitotic stages in Allium cepa root tip cells, and the role of mitosis in root growth.

5. Dual nutritional mode in Drosera rotundifolia (autotroph and heterotroph) and impact of anammox bacteria on nitrogen cycling in marine ecosystems.

6. Water transport pathways in plant roots via apoplast, symplast, and transmembrane routes, and structures facilitating water movement.