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Nutrition-in-Plants for class 7 dav Or school
- 1. Nutrition in Plants ByPrasanta choudhury
- 2. What is Nutrition •Life Processes • Nutrition • Autotrophs • Heterotrophs • Autotrophic nutrition • Photosynthesis • Chlorophyll
- 3. Life Processes • LifeProcesses- Living things breathe, eat, excrete, reproduce. All these process are essential for life And ate therefore called life process. • The process by which an organism takes food and uses it is called nutrition
- 4. Autotrophs & Heterotrophs •All livings things including plants obtain nutrients from food. Those organisms which make their own food, they are called autotrophs • Those organisms that do not make their own food are called Heterotrophs • The mode of nutrition in which living things make their own food by using simple substances is called autotrophic nutrition
- 5. Photosynthesis • Photosynthesis- Theprocesses by which green plants make their own food in presence of sunlight and chlorophyll by using carbon dioxide and water is called photosynthesis. Photo means light and synthesis means putting together • Carbon dioxide + Water-(Sunlight– Chlorophyll-- Glucose + Oxygen
- 6. The Product ofPhotosynthesis • Carbohydrate. Glucose, Starch • Phloem • By product Carbohydrate and oxygen
- 7. Conditions necessary forPhotosynthesis • The presence of chlorophyll- Chlorophyll is present in the leaves in green structure called chloroplasts • The presence of Light- Experiments • The availability of Carbon dioxide- Stomata and Each stomata is guarded by two guard cells • The availability of water- Roots, A tissue called xylem forms continuous column of tubes from roots to the leaves
- 8. Importance of photosynthesis •Plants store starch in different parts like leaves, stems and roots. So without photosynthesis, we would have no food • Photosynthesis releases oxygen as a by- product. • It also helps to control the level of Carbon dioxide in the air.
- 9. Heterotrophic Nutrition inPlants • Heterotrophic Nutrition in plants • The mode of nutrition in which an organism obtains food from other organisms is called heterotrophic nutrition • Parasitic Plants- A parasitic plant lives on or inside another living plant. It obtains nutrients from the other plants, which is called host. • The dodder or cuscuta does not carry out photosynthesis
- 10. • Insectivorous plants-The leaf of the pitcher plant forms a jug- like structure with digestive juice inside. Once an insect lands in the pitcher, it is trapped and digested • The Sundew plant has sweet, Sticky drops on the leaves to attract and trap insects • The Venus flytrap has hinged leaves with sensitive hairs on the inner side
- 11. Saprotrophic Nutrition • SaprotrophicNutrition Organisms like mushrooms are called fungi. They do not have chlorophyll. Fungi get their nutrients from dead plant or animal matter. They release digestive juice on the dead materials break it down to a liquid and absorb the nutrients. This kind of nutrition is called Saprotrophic Nutrition
- 12. Symbiotic Relationships • SymbioticRelationships- The kind of interaction, in which organisms live together or close to each other in some way, is called symbiosis. A good example for symbiosis is lichen. It looks like a plant, but is made up of an agla and a fungus. In this relationship, the alga prepare food through photosynthesis and provide it to the fungus. The fungus on the other hand fixes the alga to the surface and provides it with water and minerals. .
- 13. Replacing Nutrients inthe Soil • Replacing Nutrients in the Soil we know that plants absorb minerals from the soil, as a result , the nutrient content of the soil keep decreasing. The symbiotic relationship between Rhizobium bacteria and leguminous plants helps to replenish the soil with nitrogen naturally. The leguminous plants provides food for the bacteria, which live in the roots of the plants and form nodules. The bacteria in return convert atmospheric nitrogen into a form that the plant can use.
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