A gardener asks how the parts of a mango tree get their oxygen…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A gardener asks how the parts of a mango tree get their oxygen.
- Name the openings through which a leaf exchanges gases.
- Name the openings in the bark of an old branch.
- How does a root get its oxygen?
- Why does the tree not need a tube to carry oxygen from the leaves to the roots?
Need a reminder? The key ideaShow
Plants exchange gases through stomata, lenticels and roots, and each part looks after itself. Cellular respiration breaks food down in steps and traps energy in ATP. One mole of glucose holds kJ, and one mole of ATP holds about kJ. The share kept in ATP is the energy kept divided by the energy of the glucose.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) A leaf exchanges gases through its stomata.
Step 2. (b) An old branch exchanges gases through its lenticels.
Step 3. (c) A root takes oxygen from the air that lies between the soil particles, through its surface.
Step 4. (d) Each part of the plant exchanges its own gases, and very little gas moves from one part to another. The distance is also short, and the need for gas exchange is low.
Answer: (a) stomata; (b) lenticels; (c) from the air in the soil, through the root surface; (d) every part looks after its own gas exchange.
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