Read these seeds: pea, wheat, groundnut, castor, bean, maize and black pepper…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Read these seeds: pea, wheat, groundnut, castor, bean, maize and black pepper. A student wants to sort them.
- Which of them are non-albuminous?
- Which of them are albuminous because they keep endosperm?
- Which of them also keeps a part of the nucellus, and what is it called?
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. Seven seeds.
Plan. Sort them by what is left in the ripe seed.
Step 1. Non-albuminous. Pea, groundnut and bean. Their embryos use all of the endosperm.
Step 2. Albuminous. Wheat, castor and maize. They keep a part of the endosperm.
Step 3. The nucellus. Black pepper keeps left-over nucellus, called perisperm.
Answer: (a) pea, groundnut, bean; (b) wheat, castor, maize; (c) black pepper, the perisperm.
Watch out. Beet also has perisperm. In the non-albuminous seeds, the food is stored in the cotyledons.
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