CBSE Class 10 Science 2017 · Paper 31/2/1 · Question 35
You have to perform the experiment, “To identify the different parts of an embryo of a gram seed.” Describe the procedure that you would follow.
Answer
Soak gram seeds, remove the seed coat, separate the cotyledons and identify the plumule and radicle with a hand lens.
1. Soak a few gram seeds in water overnight; drain them and keep them covered with a wet cloth for about a day so that they stay moist.
2. Take a soaked seed and gently remove its seed coat.
3. Carefully separate the two cotyledons without damaging the embryo attached between them.
4. Observe with a hand lens and identify the cotyledons (food store), the plumule (future shoot) and the radicle (future root); draw a labelled diagram.
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