A young seed has 9 g of dry matter and 60% of its total mass is water…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A young seed has g of dry matter and of its total mass is water. As the seed matures, it loses water but no dry matter, and its water falls to of its total mass.
- What is the total mass of the young seed?
- What is the total mass of the mature seed?
- How much water does the seed lose?
Need a reminder? The key ideaShow
The zygote becomes the embryo, the PEN becomes the endosperm, the integuments become the seed coat, and the ovule becomes the seed. The embryo, the seed coat and the perisperm are diploid, and the endosperm is triploid. A mature seed has about to water. The dry matter does not change when the seed loses water.
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.
Given. Dry matter g. Water: then .
Plan. Divide the dry matter by the dry share of the total mass.
Step 1. The young seed. The dry matter is of the mass. g.
Step 2. The mature seed. The dry matter is . g.
Step 3. The water lost. g.
Answer: g; g; g.
Check. The water in the young seed is g and in the mature seed g, and the difference is g.
Watch out. The water share is a share of the total mass, and not of the dry matter.
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