PASTEUR succeeded in disproving the spontaneous generation theory because
1). he was lucky
2). he was ingenious in drawing out the neck of glass flasks, so as to provide access to air but not to microorganisms
3). of the fact that sample of yeast taken by him was dead
4). of the clear surrounding of his laboratory
Wrinkling in old age is due to
1). Collagen
2). Myosin
3). Keratin
4). Actin
The food chain in which microorganisms break down the energy rich compounds synthesised by producers is
1). detritus food chain
2). predator food chain
3). consumer food chain
4). parasitic food chain
Continuity of germplasm theory by WEISMANN was proposed in
1). 1838
2). 1883
3). 1865
4). 1859
The youngest layer of secondaryh1oem in woody dicot stem is located
1). Just outside the vascular cambium
2). Just on the inner side of cambium
3). Between periderm and primary cortex
4). Just outside pith