Tube example sentences

The pollen grains germinate on the stigma and the resulting pollen tubes grow through the tissues of stigma and style and reach the ovule.The DCTs of many nephrons open into a straight tube called collecting duct, many of which converge and open into the renal pelvis through medullary pyramids in the calyces.Groundwater is a source of water for wells, tubewells, springs and many rivers as you learnt in Chapter 1 Thus, it becomes the most common route for water borne diseases.Electricity powers all the tubewells in the fields and is used in various types of small business.The pollen tube enters the embryo-sac where two male gametes are discharged.But most of chemical reactions are carried out not at constant volume, but in flasks or test tubes under constant atmospheric pressure.Charges do not flow in a copper wire by themselves, just as water in a perfectly horizontal tube does not flow.Note that the system may be defined by physical boundaries, like beaker or test tube, or the system may simply be defined by a set of Cartesian coordinates specifying a particular volume in space.Also, continuous use of groundwater for tubewell irrigation has reduced the water-table below the ground.If 'hydro' means water and 'chemo' refers to chemicals, what would 'hydrotropism' and 'chemotropism' mean? Can we think of examples of these kinds of directional growth movements? One example of chemotropism is the growth of pollen tubes towards ovules, about which we will learn more when we examine the reproductive processes of living organisms.The farmers in these regions set up tubewells for irrigation, and made use of HY seeds, chemical fertilizers and pesticides in farming.If we repeat the experiment taking two tubes of different diameters we find that at equilibrium the level of coloured water in two cylinders is different.The toothbrush and tube containing the paste are made of plastics from petroleum.Soon, however, farmers started setting up private tubewells.While the growth of a pollen tube is measured in terms of its length, an increase in surface area denotes the growth in a dorsiventral leaf.