instruction:
In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 
question:
The spider picks a suitable place. The spider produces sticky silk from its abdomen. The spider attaches it to objects where it wants to build the web. The spider strings this silk back and forth between objects. A web is created. 
answer:
How does a spider make its web?


question:
A flowering plant has stamen and pistils. An insect ot bird lands on the plant. Some of the pollen sticks to it. The insect or bird travels to another plant of the same species. The pollen is tranferred to the new plant. 
answer:
How does pollination happen?


question:
When water freezes it becomes 10% bigger, or takes up 10% more space. As water expands it puts great pressure on the walls of anything containing it, including any rocks which happen to be surrounding it. The force of the pressure exerted on the rock surrounding it is enough to wedge the walls of the crack farther apart, thus expanding and deepening the crack. Clay expends when wet like ice does. This causes rock to break apart. Some plants like mosses and lichens are capable of growing without soil on bare rock. When they do this their roots penetrate pores and crevices and cause rocks to split apart as the roots force their way down through the rocks. 
answer:

How does weathering cause rocks to break apart?


