Composition of the biosphere and living matter
Answers are for parents and teachers.
1
If every 1000 radiolarian shells give 6 mg of silicon, how many mg do 7000 give?
42
2
Group these: basalt, peat, soil, bacterium, meteorite. Write a group name for each.
Basalt – solid; peat – biogenic; soil – bio-inert; bacterium – living; meteorite – cosmic.
3
Give one example each of active and passive movement of living matter.
Active: a fish swims against the current; passive: wind carries a plant seed.
4
Which two atmospheric gases does the gas-exchange function keep in balance?
Oxygen (photosynthesis) and carbon dioxide (respiration).
5
Why is living matter called a «powerful force» even though its mass is tiny compared with the whole biosphere?
Because it continuously changes the atmosphere, soil, rocks and the cycling of matter.