CLAPSTONE LEARNING

Effect of Light Intensity on the Rate of Photosynthesis  Light intensity   is one of the factors affecting the rate of photosynthesis. Other factors are concentration of carbon dioxide, temperature and to a lesser degree, water.  Light intensity directly affects the  light-dependent  reaction in photosynthesis and indirectly affects the light-independent reaction. Light is  a limiting factor  when the light intensity is too low to allow the light-dependent reaction to proceed at its maximum rate. Light is not normally a limiting factor except for plants in forest understory of other shaded plants. Very high light intensities  may slow the rate of photosynthesis due to bleaching of chlorophyll. However, plants exposed to such conditions usually have protective features to include thick, waxy cuticles and hairy leaves. Measuring the rate of oxygen evolution using a water plant is commonly used to measure the rate of photosynthesi...

Why Are Sunsets Red Orange? Science Experiment | STEM (Video) Last updated  05/16/2017 Since our popular experiment “ Why is the sky blue?” , many have been asking, “Why are sunsets red / orange in color?” I’m so glad these people have asked such an excellent question, like all good scientists do! So I came up with another experiment, but I wasn’t sure if it would succeed in demonstrating how the sky would turn from blue to red / orange. My daughter had much more confidence in me than I did and kept urging me to try it. And she was right! See the video above for the amazing result. Besides moving a flashlight around, sunset colors can also be created when white light travels for a long distance through a medium filled with small particles. The following are two more ways you can create a homemade sunset. What you need a  rectangular clear glass container  or a long clear drinking glass water soap (preferably white, I used  Kirk’s Castile...

Why Is The Sky Blue? Simple Science (Video) Last updated  05/25/2017 The Blue Sky On a clear day, you can see that the color of the sky is blue even though sun light does not seem to contain any color. So  why is the sky   blue  if sunlight is colorless? Refraction Of Light The “colorless” light from the sun is actually white light. It is made up of all the rainbow colors – red, orange, yellow, green, blue, indigo, violet – mixed together. Light bends when it passes from one medium (e.g. air) into another medium of a different density (e.g. water). This bending of light is called  refraction . Different colors are  refracted  by different angles because they have different wavelengths. As a result, when white light is refracted, it is separated into different colors, known as  dispersion of light . A rainbow is an excellent demonstration of the dispersion of light. After or during rainfall, you can see a  rainb...

Brilliant Biology Student Diffusion & Osmosis Investigating Osmosis Using Potato Strips Investigate Osmosis using Potato Strips Osmosis can be easily demonstrated in biological systems using  potato strips, water and salt or sugar solution. Remember that osmosis is defined a net movement of particles of  solvent  along its concentration gradient, across a  selectively permeable membrane , until equilibrium is established. In this experiment the solvent particles are water particles, the selectively permeable membrane are the cell membranes of the cells in the potato tissue. The concentration gradient is  the result of the difference in the concentration of solute in the cytoplasm of the potato cells and the solutions. Apparatus & Materials 3 Potato strips (5 x  1 x 1) cm  (or potato cylinders/cores  of equal length e.g. 5 cm  diameter, made wit...