Part of the plant mongo day 3
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Mongo seeds are the familiar white bean sprouts seen in stores and restaurants. They're also known as mung beans, or mungbeans; their taxonomic name is Vigna radiata. They're easy to sprout in the classroom or home, and they illustrate the stages of germinating dicotyledonous seedlings -- dicots for short. Dicots sprout with separate leaves on a stem, unlike single-leaf monocots like grass. Mongos are also epigeal, meaning the seedlings emerge from their seed husks and leave them below ground.
Taking up Water
The first step is to soak the dry beans so they absorb water to begin the germination process. Any beans that float will not be viable. Given a day of soaking, the beans will swell as they take in water. Mung beans more than double their weight, and nearly triple their volume. While the water level in the container doesn't change, the swelling beans take up a greater proportion of the volume.
A Root Emerges
The seed husk, called the testa, swells more quickly than the embryonic seedling inside. The first sign of germination is the emergence of the white root tip called the radicle. Since this growth process requires oxygen, the beans are drained for exposure to air while sprouting. With each day, these roots grow longer. If the beans are sprouted in soil, there's nothing to see yet above the surface while this is happening.
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