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.
1 The process of photosynthesis is divided into two main parts: light dependent reactions and light independent or dark reactions. 2  The light dependent reaction happens when solar energy is captured to make a molecule called ATP (adenosine triphosphate).