by Milan Sanader | Jan 26, 2021 | Gr. 11-12 Biology, Gr. 11-12 Chemistry, Gr. 11-12 Physics
Trees create immense negative pressures of 10’s of atmospheres by evaporating water from nanoscale pores, sucking water up 100m in a state where it should be boiling but can’t because the perfect xylem tubes contain no air bubbles, just so that most of it...
by msander | Jul 14, 2019 | Gr 7-8 Science & Tech, Gr 9-10 Science, Gr. 11-12 Biology
Trees can weigh hundreds or even thousands of tons, but where do they get this mass from? A few common answers are: the soil, water, and sunlight. But the truth is the vast majority of a dry tree’s mass comes from the air – it originated as carbon...
by msander | Mar 15, 2018 | Gr 9-10 Science, Gr. 11-12 Biology
Introduction Watch as chlorophyll transforms from an intense green to a bright red colour as UV light is absorbed and photons are emitted from the solution. Discussion Chlorophyll is the green pigment essential for photosynthesis. It is found in all plants and readily...
by msander | Mar 16, 2017 | Gr 4-6 Science & Tech, Gr 7-8 Science & Tech, Gr 9-10 Science, Gr. 11-12 Biology, Gr. 11-12 Chemistry
There’s a new trend in agriculture called vertical farming. As humans learned to farm, we arranged plants outside in horizontal fields, and invented irrigation and fertilizer to grow bumper crops. But with modern technology and farmers’ cleverness, we can now stack...
by msander | Jun 22, 2015 | Gr 9-10 Science
This activity is just one of 40 activities in the Grade 9/10 demo series available at the STAO website. Introduction The cells of green plants contain the pigment chlorophyll in organelles called chloroplasts. Chloroplasts capture the Sun’s energy and store...
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