Shyam took a thin layer of onion peel with a drop of water then he stained the sample with the solution. After staining, he washed with water and kept it on a clean surface of slide and with the help of blotting paper, he removed the excess of water. Then he transferred it on a slide and added a drop of glycerine and placed the coverslip on the glass slide to observe the cells under a microscope. 3(a). Coverslip is put on the mounted material on a slide very gently to Avoid oozing of stain
Avoid oozing of glycerine
Avoid entry of air bubbles
Avoid the crushing of mounted materials​

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary