Why had the water drops appeared only along the leaf margins?
Ans11. Since it was cold season and the field was well irrigated, the water droplets were seen as a result of the process of guttation, which occurs in the herbaceous plants in nights. The water drops were seen only on the margins of leaf because the ‘Hydathodes’ from which guttational water loss occurs are found near the vein endings only. Q12. Give the scientific name of the modern wheat. Why is it quoted as a typical example of rapid speciation? Ans12. Modern wheat is Triticum aestivum. It is quoted as a typical example of rapid speciation because it has originated by natural interspecific crossing and diploidisation of the hybrids. The final hexaploid Triticum aestivum is very different from any of its parents: T. monococcum, T. durum, Aegilops speltoides, or A. squarrosa. Q13. Name any two of cyanobacteria and explain how they serve as main sources of bio-fertilizers. Ans13. Nostoc and Anabaena are two of the cyanobacteria. Cyanobacteria are main sources of biofertilisers because
