G5 EVS LN -3 A natural balance ppt.pptx
- 2. Look at my friends! What are they doing?
- 3. Look at the pictures and speak about: What do they eat? Who will get food for them?
- 5. All living things need food to survive. Animals are dependent on plants for food, shelter and oxygen while green plants make their own food. How do plants make their own food?
- 6. LEAF Leaves are flat blade like structures that are attached to the stem. They prepare food for the plant. So, they are called the food factory of the plant. Plants breathe through small openings on their leaves called stomata. Carbon dioxide is absorbed through this stomata. All leaves are green due to the presence of a green pigment in the leaf called chlorophyll.
- 7. Food for Plants (Green Plants) Plants (Producers) FOOD (Sugar or glucose) (Leaves) sunlight water and minerals carbon-di- oxide PHOTOSYNTHESIS Photo light, synthesis putting together stomata
- 8. Photosynthesis Green plants absorb energy from the sun. This energy is absorbed with the help of a pigment called chlorophyll, which is present in all the leaves. Water and minerals are absorbed by the roots and are carried to the other parts of the plant. Carbon-di-oxide is absorbed through tiny pores in the leaves called stomata. Water and minerals
- 9. Carbon-di-oxide + water Sugar + oxygen Sunlight, water and carbon-di-oxide are used to make food in the form of glucose or sugar and oxygen is released into the air. sunlight chlorophyll A portion of glucose is used by plants for their growth. The remaining glucose is stored as starch in different parts of the plants such as roots, stems, leaves, seeds and fruits. Some vegetables like potato and tapioca are rich in starch.
- 10. Extended Learning Have you seen these kind of leaves? Why are they in different colours? How do they prepare food for them without chlorophyll? Yellow-Orange colour is due to the presence of a pigment called Carotenoids. Red or purple colour is due to the presence of a pigment called Anthocyanins. The large amount of red, yellow and purple pigment mask the green colour of chlorophyll in these leaves. But still chlorophyll is present in small amount.
- 11. Extended Learning Do you know how the animals who eat only leaves are called? They are called folivores. E.g.: koala bears, giraffes, caterpillars etc. Which tree has the longest leaf in the world? Raphia regalis, a species belonging to the palm tree.
- 12. Video link: New Words survive stomata chlorophyll glucose released starch
- 13. Home Fun Question Time! 1. ____________ is the food factory of a plant. (stem / leaf) 2. What do plants need for photosynthesis? 3. Name the pigment which is present in the leaves. (chlorophyll / stomata) 4. The gas which is absorbed through the stomata of leaves (Oxygen / carbon dioxide) 5. The pigment which is present in yellow coloured leaves (Carotenoids / Anthocyanins) 6. Name a folivore - ____________ Place a healthy, growing, leafy plant by the window for three days. Take a tape and cover it over some of the leaves. After three days, remove the tape and observe the colour. Take a picture, write your observation and send it to me.
- 14. Parasitic Plants Plants obtain nutrients from the soil. Overtime these nutrients run out and need to be replaced. This is why gardeners add manure and fertilizers in the soil. Plants that obtain nutrition by growing on other plants are called parasitic plants. The plants on which the parasitic plants feed are called host plants. Host plant Parasitic plant
- 15. Parasitic plants attach themselves firmly to the stems or roots of the host plant to absorb nutrients. E.g. Mistletoe, dodder or cuscuta. Non-green plants like mushroom, mosses and some fungi depend on other plants for food.
- 16. Epiphytes They are plants that grow on another plant or an object for physical support. E.g. Orchids, ferns and mosses.
- 17. Carnivorous or Insectivorous Plants Plants that obtain nutrition by eating small animals such as insects, flies and bugs are called carnivorous or insectivorous plants. They grow in soil and lacks certain nutrients like nitrogen. They trap insects to get nitrogen. However, all carnivorous plants derive energy from the sun and depend on animals for nutrition. Carnivorous plants digest their prey using enzymes. E.g. Pitcher plant, sundew and Venus fly trap. Sun dew plants have a gel-like sticky substance that covers the leaf. Insects easily get stuck to the plant and become prey.
- 19. Carnivorous or Insectivorous Plants Sun dew plants have a gel-like sticky substance that covers the leaf. Insects easily get stuck to the plant and become prey.
- 21. The Venus fly trap has jaw like leaves with spiky teeth along the edges. As soon as an insect sits on the leaf, the leaf closes and traps it.
- 23. A pitcher plant looks like a pitcher with a lid. It has hair and nectar inside that attracts insects. As soon as an insect sits on it, the lid closes, thus trapping the insect.
- 24. New Words Video link: https://www.youtube.com/watch?v=4yvUjwt2-jI&t=57s : chlorophyll parasitic carnivorous insectivorous enzyme pitcher stomata pitcher photosynthesis
- 25. Food for Animals All animals are consumers as they depend on plants as well as animals for food. Plants Producers Animals Consumers Based on the kind of food they eat, animals are classified as: Animals who feed on only plants. E.g. cows, deer, elephants, goat etc. Animals who feed on other animals. They indirectly depend on plants for their food. E.g. lions, tigers, leopards etc. Animals who feed on both plants and animals. E.g. crows, cockroaches, bear etc.
- 26. The animals who help us to keep the environment clean by eating dead animals. E.g. Hyenas, vultures, crows etc. The organisms that obtain their food by consuming dead and decaying plants and animals. E.g. Bacteria, fungi and earthworms. All dead plants and animals are recycled in nature by the decomposers that help to release nutrients from them into the soil, which are then used by the plants for nutrition.
- 27. Interdependence It is the dependence of two or more living organisms on each other. Plants and animals depend on each other for various needs. Plants depend on animals for carbon-di-oxide, insects such as bees and birds help in seed dispersal and earthworms help to make the soil fertile for plant growth.
- 28. Animals and human beings depend on plants for food and oxygen. Some animals depend on plants for shelter. Human beings also depend on plants for other needs such as clothes and medicines. Plants are sources of non-renewable resources like coal, petroleum and wood.
- 29. New Words Video link: :https://www.youtube.com/watch?v=4-zRIZlpih8 consumers herbivores carnivores omnivores scavengers decomposers interdependence bacteria fungi
- 30. Food chain It is the chain formed when plants are eaten by animals and then these animals are eaten by other animals. Food chains show how energy is passed form the sun to producers, from producers to consumers and from consumers to decomposers. Plants are eaten by herbivores, which in turn are eaten by carnivores. Sun producers consumers decomposers
- 31. Food chain on land A rabbit eating grass is an example of a simple food chain
- 32. Food chain in water In pond or a river, the food chain starts with aquatic plants such as algae because they are producers. Snails feed on algae and are then eaten by fish. Fish are eaten by cranes. algae snail fish crane
- 33. Food web A food chain does not exist independently in nature. Different interconnected food chains form a food web. Organisms of one food chain can be eaten by different organisms of another food chain. Plants are eaten by herbivores such as grasshoppers, rabbits and deer. Herbivores are eaten by many carnivores such as tigers, lions and wolves. In the same way, lions can eat deer, rabbits, zebras and cows.
- 34. Food chains and food webs maintain a natural balance in the population of living things on the Earth. Animals, plants, birds and marine species are as important as human beings. If the population of one organism increases or decreases, the entire food chain gets disturbed.
- 35. Extinction of Living Organisms All living organisms on the Earth have a unique place in the food chain that helps them contribute to the ecosystem. An ecosystem is a community of interacting organisms and their physical environment. However, many animals, plants are endangered. An endangered species is an animal or plant species that is danger of becoming extinct, that is, its number is decreasing rapidly. This happens because of an increase in the number of predators, climate change or loss of natural habitat. Video Link: https://www.youtube.com/watch?v=RBdLF0JlvW8