Section A
Q1.
(a) Give two examples where microbes have helped in controlling soil and water pollution and mention how.
(b) What are phytotoxins and phytoalexins ? Discuss the role they play in plant pathogenesis.
(c) Give a brief account of structure and function of heterocyst.
(d) Briefly discuss the morphological and anatomical features of sporogonium of Marchantia.
(e) List five angiosperm-like features of Gnetum. However, justify its inclusion in gymnosperms.