Question

Herbicides allow cereal crops to be grown very efficiently, with virtually no competition from weeds. In britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated

Answer 1

Vallisneria is an aquatic plant in which pollination occurs by water. Hence, the pollen grains of Vallisneria are covered with a mucilaginous covering to protect them from wetting by water.