Seeds - Plant Science - Lecture Slides, Slides for Plant Biotechnology. Shree Ram Swarup College of Engineering & Management

Plant Biotechnology

Description: Plant science is not only a subject but a field of biology. This lecture covers following important points: Seeds, Basic Parts of Seeds, Food Supply, Ovary Wall or Seed Coat, Germination, Needed for Germ, Seed Absorbs Water, Embryonic Shoot Emerges, Monocot Seeds, Seed Coat Protection
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Plant Classification

Seeds

What are seeds?

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Basic Parts of Seeds

• 1. Embryo • 2. Food Supply • 3. Ovary wall or seed coat

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Germination • Needed for Germ • 1. Temperature • 2. Moisture • 3. Air • 4. Light or absence of it

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Germination • Process • 1. Seed absorbs water • 2. Seeds proteins activated • 3. Radicle (root) emerges

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Germination • 4. Plumule or embryonic shoot emerges • 5. Leaves form and food production begins

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Monocot Seeds • 1. Seed coat-protection • 2. Endosperm- a source of energy • 3. Embryo-miniature plant that has

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Monocot Seeds • 3.Embryo:

– Epicotyle-shoot above cotyledon – Hypocotyl-part of stem below the cotyledon – Radicle- primary root, supports seedling

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Dicot Seeds

• 1. Seed Coat-protection • 2. Embryo miniature plant

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Dicot Seeds • 2. Embryo-

– 2 cotyledons-seed leaves – Epicotyl-true leaves – Hypocotyl-first stem, pulls seed upward – Radicle-forms roots

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Monocot Germination • 1. Seed swells • 2. Radicle grows down • 3. First internode and epicotyl grows upward

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Monocot Germination • 4. New leaves form and food production

starts • 5. New root system develops • 6. Temporary root system ceases to function

and dies

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Dicot Germination • 1. Seed swells • 2. Radicle grows down • 3. Hypocotyl forms arch that breaks soil

surface

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Dicot Germination

• 4. Hypocotyl reaches light and straightens up • 5. Cotyledons turn green and make food • 6. As new leaves develop, cotyledons dry up

and fall off

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