Cbse grade 7 chapter 11 reproduction in plants
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1. Plants reproduce both sexually through the fusion of male and female gametes to form seeds, and asexually through vegetative propagation, budding, and spore formation involving a single parent. 2. Sexual reproduction involves pollination of flowers transferring pollen, fertilization fusing the gametes, and fruit and seed formation housing the embryo. 3. Asexual reproduction methods include vegetative propagation using plant parts like stems, roots, and leaves, as well as budding and spore formation which create clones of the parent plant.
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Cbse grade 7 chapter 11 reproduction in plants
- 1. 11 REPRODUCTION IN PLANTS y r. Arshad Keethadath
- 2. PLANT PARTS
- 3. REPRODUCTION IN PLANTS Reproduction is the process of producing young ones from their parents ASEXUAL REPRODUCTION Single Parent is involved Simple division of a plant body into two or more Parts or formation of spores SEXUAL REPRODUCTION Two parents are involved Fusion of male and female gametes produce zygote which develop into seed VEGETATIVE REPRODUCTION Cell, tissue or part of an organ of a plant develops into a new organism
- 4. ASEXUAL REPRODUCTION Formation of new plants from the cells of a single parent BUDDING A small bulb-like cellular out growth, called bud is formed on parent cell that develops into an independent organism. YEAST BUDDING A small bulb-like cellular out growth, called bud is formed on parent cell that develops into an independent organism. YEAST SPORE FORMATION Parent plant produce microscopic single or multi -celled spherical bodies which germinate into new plants during favourable condition. Ferns, Mosses SPORE FORMATION Parent plant produce microscopic single or multi -celled spherical bodies which germinate into new plants during favourable condition. Ferns, Mosses FRAGMENTATION The adult organism breaks up into two or more pieces called fragments, which grows to become a new plant Algae – Spirogyra, Fucus FRAGMENTATION The adult organism breaks up into two or more pieces called fragments, which grows to become a new plant Algae – Spirogyra, Fucus
- 5. VEGETATIVE REPRODUCTION Plants vegetative parts such as root, stem and leaf is used to produce new plants NATURAL METHOD Roots Stems (Rhizomes Bulbs Tubers Corms) Leaves NATURAL METHOD Roots Stems (Rhizomes Bulbs Tubers Corms) Leaves ARTIFICIAL METHOD Cutting Grafting Layering Tissue culture ARTIFICIAL METHOD Cutting Grafting Layering Tissue culture
- 6. ROOTS Tuberous roots of Dahlia, sweet potato and Asparagus
- 7. STEMS Most common for vegetative propagation Different kinds STEMS Most common for vegetative propagation Different kinds RunnersRunners Underground StemUnderground Stem Oxalis and grassOxalis and grass Chrysanthemum and mintChrysanthemum and mint VallisneriaVallisneria RhizomesRhizomes BulbsBulbs TubersTubers ComsComs
- 8. Oxalis and grassOxalis and grass Horizontal stems will produce new roots at nodes and then shoot grow upwards forming new plants at frequent intervals Chrysanthemum and mintChrysanthemum and mint Horizontal stems arise from the base of the erect shoot come out to form new aerial shoots and it become independent plants VallisneriaVallisneria Arched stems which cross over small obstacles develop small plantlets at their nodes RunnersRunners
- 9. Underground StemUnderground Stem RhizomesRhizomes BulbsBulbs Ginger, turmeric and banana Onions
- 10. TubersTubers ComsComs Buds in the eyes give rise to new plants - Potato Lots of rhizomes joined which develop into new plants - Gladiolus
- 11. LEAVES Leaves develop small buds called adventitious buds, on their margin. This grow into new plant once get touch with soil Bryophyllum LEAVES Leaves develop small buds called adventitious buds, on their margin. This grow into new plant once get touch with soil Bryophyllum
- 12. ARTIFICIAL METHODS • CUTTING • GRAFTING
- 13. • LAYERING • TISSUE CULTURE
- 14. SEXUAL REPRODUCTION • Carried out by flowering plants • Flowers are the reproductive organs of a plant The sexual reproduction is the formation of new plants through the fusion of male and female gametes The sexual reproduction is the formation of new plants through the fusion of male and female gametes Complete or Bisexual Flowers Contains both male and female reproductive cells Have all the four parts -Sepals -Petals -Stamens -Pistils Complete or Bisexual Flowers Contains both male and female reproductive cells Have all the four parts -Sepals -Petals -Stamens -Pistils Incomplete or unisexual Flowers Contains either male or female reproductive cells Have only three parts -Sepals -Petals -Stamens or Pistils Incomplete or unisexual Flowers Contains either male or female reproductive cells Have only three parts -Sepals -Petals -Stamens or Pistils Example: Hibiscus, CitrusExample: Hibiscus, Citrus Example: papaya, cornExample: papaya, corn
- 16. STAMENS (Male Organ) Bear Anthers – contain pollen grains which produce male cells/gametes STAMENS (Male Organ) Bear Anthers – contain pollen grains which produce male cells/gametes PISTLE (Female Organ) Composed of Stigma, style and ovary. The ovary produce female cells/gametes PISTLE (Female Organ) Composed of Stigma, style and ovary. The ovary produce female cells/gametes
- 17. Mature plant flowersMature plant flowers PollinationPollination FertilizationFertilization FruitsFruitsSeedsSeedsNew PlantsNew Plants
- 18. POLLINATION Transfer of pollen grains from anther to the stigma of a flower is known as pollination • Is the first step in the process of seed formation Two TypesTwo Types Cross-pollination Pollen grains are transferred from anther of one flower to the stigma of another flower of same kind (different plants) Cross-pollination Pollen grains are transferred from anther of one flower to the stigma of another flower of same kind (different plants) Self-pollination Pollen grains are transferred from anther to the stigma of the same flower Self-pollination Pollen grains are transferred from anther to the stigma of the same flower
- 20. AGENTS OF POLLINATION 1. Wind Wind blows away pollen grains from the anthers of one flower to the stigma of another flower Features of flowers – - Small. - Not brightly coloured. - Do not produce nectar. Features of pollen grains – - Very light - Produced in large numbers Examples: Pollination in wheat, rice and maize
- 21. 2. Water Pollen grains are released into the water are carried out by water current to other flowers. Example: Aquatic plants such as sea grass and Vallisnaria
- 22. 3. Insects Insects visit flowers for nectar – Some pollen grains stick to the body parts of these insects – when these insects visit another flower, the pollen grains fall on the stigma Features of flowers – - Sweet smell. - Brightly coloured petals for diurnal insects. Eg. Rose, sun flower - White/light green petals for nocturnal insects. Eg. Jasmine and Cacti - Rich in nectar. Features of pollen grains - Sticky pollen grains
- 23. FERTILIZATION After successful pollination the stigma secrete nutrients Pollen grains absorbs these and start growing in the form of a thin tube called pollen tube until it reaches the ovule inside ovary. Then releases male gamete into the ovule – fertilization takes place – results in the formation of zygote The process of fusion of male and female gamete is called fertilization
- 24. FRUIT AND SEED FORMATION • After Fertilization ovary enlarges to form the fruit • The wall of the ovary become the fruit wall • The ovules become seeds – a fruit may have one or more seeds • Petals, sepals and other parts of the flower usually dry up and fall off
- 25. The fruit is the seed-bearing part or the ripened ovary of the flowering plant The fruit is the seed-bearing part or the ripened ovary of the flowering plant The seed is the ripened ovule which contains an embryo and is a covered by a protective coat The seed is the ripened ovule which contains an embryo and is a covered by a protective coat The process by which the embryo in the seed becomes active and begins to grow into a new plant is called germination The process by which the embryo in the seed becomes active and begins to grow into a new plant is called germination
- 26. SEED DISPERSAL The process by which seeds or fruits are scattered is called dispersal Dispersal takes place by several mechanism • Dispersal by Explosion: Pea plants, castor and balsam • Dispersal by Wind: Dandelion, drumstick and maple • Dispersal by Water: Coconut • Dispersal by Animals: Plants having fleshy fruits