Here's what happens: 1  The receptors, which are nerve endings in your nasal passageways, detect an irritant. 2  Nerves carry these impulses to the sneezing center in your brain stem. 3  The sneezing center sends its instructions along your facial nerve and the nerves that lead to your lungs and diaphragm. 4  Your eyes start to water, and your nasal ...
TOP. THE MAIN EVENTS OF PHOTOSYNTHESIS (higher level). Photosynthesis takes place in two stages; the light stage and the dark stage. The light stage needs light so it is called the light-dependent stage. The dark stage is called the light-independent stage. TOP. THE LIGHT STAGE. The light stage takes place in the chloroplast s thylakoid membranes. The events of the light stage are as follows: 1. Light Absorption: All the colours of white light (except green light) are absorbed by pigments in the chloroplast.
The whole process doesn't happen all at one time. The process of photosynthesis is divided into two main parts. The first part is called the light dependent reaction. This reaction happens when the light energy is captured and pushed into a chemical called ATP. The second part of the process happens when the ATP is used to make glucose (the Calvin Cycle).