Vous avez cherché: cotyledon (Anglais - Hindi)

having one cotyledon in the seed as in most flowering plant .
बीज में एक बीजपत्रक होना जैसा अधिकतर पुष्प पादपों में होता है

in dicotyledon plant two cotyledon appears at the time of germination .
द्विबीजपत्रकों में अंकुरण के समय दो बीजपत्रक दिखाई देते हैं

in plants of class dicotyledonae two cotyledon appears at the time of germination .
डाइकोटिलीडनी वर्ग के पादपों में अंकुरण के समय दो बीजपत्रक दिखाई देते हैं

the germination process through seed germination, a seed begins to grow, up to the surface to become a seedling, and then to hopefully flourish into a plant. a seed needs proper materials to 'come alive' from a dormant state and kick-start the process of growth. in this lesson, we'll learn what nutrients seeds need to 'wake up' and start to grow, and we'll look at the structures that emerge in germination. here is a seedling that has begun to grow after waking up in germination seed germinating proper nutrition in order for seeds to germinate, they need water, oxygen, correct temperatures, and sometimes light. remember, seeds do not have leaves that are able to absorb light and carry out photosynthesis. due to this, most of the energy is utilized via aerobic respiration, much like in an animal cell, which requires oxygen and water in order to work correctly. the seed will already have stored sugars, proteins, and other nutrients, so it will need oxygen and water to help break these apart. in our own bodies, we use oxygen and water to break chemical bonds in order to harness that energy. seeds are very similar to us in that sense because they lack the ability to 'make' their food like a fully grown plant will. many plants need cold to begin the process of growing and still others need heat, some extreme heat, to spark growth. this will be dependent upon the particular type of seed that is growing. our common houseplants, vegetables, and landscaping-type plants usually require average temperatures anywhere from 50-80 degrees to germinate. while light may not affect seeds in the typical manner it affects grown plants, it can have some effect. some seeds will not begin to germinate until the forest allows for enough light. this way, once the seed breaks the surface, it will be able to gather the light needed for proper growth. growth in order to understand how exactly germination happens, we need to learn more about types of seeds. there are two types of plants that produce seeds. angiosperms produce seeds that are covered in a protective coating. these include fruits, such as an apple. then we have gymnosperms, whose seeds are 'naked', such as pine trees. among the angiosperms, there are monocots (one cotyledon) and dicots (two cotyledons). monocots include grains, bananas, palms, bamboo, and flowers that grow from bulbs (crocuses, irises, lilies etc). dicots include plants like oaks, magnolias, sunflowers, tomatoes, strawberries, squash, legumes, lettuce, and most of the plants we normally see. it's important to distinguish between monocots and dicots because they germinate differently. cotyledon is literally translated as 'seed leaf'. cotyledons are the first leaves that are produced by the seed upon germination. if you were to cut open the seed, the cotyledon is one of the largest parts that you can see right away. notice the difference between a monocot that has one cotyledon (left) and a dicot that has two cotyledons (right). monocot and dicot regardless of the type of seed, monocots and dicots will sprout (grow) somewhat similarly. in both seeds, the radicle (the primary root, the seed's first root) grows out of the seed and anchors itself into the ground. this allows for nutrients and water to be taken up into the seed. once sufficient water is absorbed, an embryonic shoot emerges. this is where monocots and dicots diverge. here you can compare the seed structure of a dicot (1) and a monocot (2). dicot: a: seed coat; b: cotyledons (two cotyledons); c: hilum; d: plumule; e: radicle / monocot: a: seed coat; b: cotyledon (one cotyledon); d: plumule; e: radicle; f: endosperm dicot and monocot seeds in dicots, you can have two different types of germination, epigeal and hypogeal. the embryonic shoot has three parts: the cotyledons, the hypocotyl (part below the cotyledons), and the epicotyl (part above the cotyledons).
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