Question

STEM CONNECT WORKSHEET 6 Date 302 Under Adult CAUTION Supervision Biodegradability test using boiling water You will need: a kettle to boil water a glass beaker or jug lengths of string, each about three times the depth of the beaker binder or foldback clips four different materials to test, including at least one made of plastic a stopwatch m 500 400) 300 200) Method: Tie a piece of string through the loops of each clip. 2. Check that the strings are all long enough: put the clips in the bottom of the empty beaker, with the strings hanging over the sides. The ends of the strings should reach at least to the table. 3. Make any observations or measurements you want before you start, and record them. 4. Clamp a clip around each piece of material. 5. Boil water in the kettle. 6. Carefully pour boiling water into the beaker. You might need an adult to help you with this step. Add the clipped pieces of material to the beaker, making sure the strings hang over the sides, Be very careful not to touch the boiling water! 8. Start the stopwatch. 9. Record your observations or measurements at your planned times. If you want to remove the materials at any point, pull on the strings carefully, and leave the item to cool for a few minutes before touching it or removing the clip. 10. After 30 minutes, remove all the items and record your final observations or measurements.​

Answer 1

• Photophosphorylation is the process of utilizing light energy from photosynthesis to convert ADP to ATP. It is the process of synthesizing energy-rich ATP molecules by transferring the phosphate group into ADP molecule in the presence of light.