ENVIRONMENT - CLASS 9- 13/12/2021
LOSS OF BIODIVERSITY: How biodiversity gets destructed ? *currently we are experiencing anthrophocene extinction. *more changes are made by humans to the nature. CAUSES OF BIODIVERSITY LOSS: * Natural cause *Man made cause NATURAL CAUSE: *Climate change , hot and cold cycle of climates *Forest fire: *slash and burn cultivation *firing the ground in search of deer Horn *gender reveal culture by US Citizens MANMADE CA…
Environment Class 8- 06/12/2021
Presentation of Earth's Biodiversity As per IUCN Total number of Species- 1.5 million Out of which 22% are plants and 78% animals. 70% of animals are insects. Number of Fungal species is greater than that of amphibians, reptiles and fishes. India has 24% of Land but nearly 7% of world's species diversity. Importance of Biodiversity: Helps with ecosystem services, provides natural beauty, stabilises the environment and has ethical significance. Measurement of Biodiversity: a) Alpha diversity b) Beta diversity c) Gamma div…
Environment Class 6- 27/11/2021
Ecosystem Services Outputs, conditions or processes of natural systems that directly or indirectly benefit humans or enhance their welfare. Types : 1)Provisioning Services that people extract from nature Eg: Water, air, Timber 2) Regulating : Ecosystem processes that regulate natural phenomena 3)Cultural : Non-material benefit associated with culture. Eg: Musics, dance of tribes associated with culture. 4)Suporting : Services that sustain nature itself. ie the services that support other 3 services. Adaption : Living beings ada…
Environment Class 5- 18/11/2021
ECOSYSTEM – Structure and Functions. Definition: Ecosystem is the total interaction between living (biotic) and non-living (abiotic) components capable of independent existence. Stratification: vertical distribution of different species occupying different levels in an ecosystem (each layer has plants and animals). Functions of an Ecosystem: 1. Productivity 2. Decomposition 3. Energy flow 4. Nutrient cycling PRODUCTIVITY: The rate at which radiant energy is fixed in the form of organic food due to the photosynthetic …
Environment CLASS-4 10-11-2021
GENETICALLY MODIFIED CROPS: Genetically modified crops (GM crops) are plants used in agriculture, the DNA of which has been modified using genetic engineering techniques.Genetic Modification is also done to increase nutritional value, bioremediation and for other purposes like production of pharmaceutical agents, biofuels etc.It allows selected individual genes to be transferred from one organism into another, also between non-related species. Foods/Crops produced from or using GM organisms are often referred to as GM foods/crops. Bt cotton is…
Environment class 3- 07/11/2021
Ecological Niche Specific role and position a species has in its environment . When 2 species have a same ecological niche , competition arises between them. As a result of the competition: 1) Either of the species gets killed 2) Relocates 3) Undergoes physiological and behavioral changes. Eg: Lions preys at day while hyenas prey at night. Ecological Succession : Gradual and fairly predictable change in the species composition of a given area. Some species colonize an area and their populations increase while others decline in nu…
Environment Class 2 - 30/10/2021
Negative Interactions – Interaction between two species where atleast one of the species gets harmed. Types : Predation (+,-): Ø It is the relationship between the predator and the prey where the prey is food for the predator. Ø Ex) Cheetah and deer. Cheetah hunts the deer for food. Ø Predation is a natural process which controls the population growth of the prey without which the ecosystem won’t survive. Parasitism (+,-): Ø It is the interaction between two species in which one (the parasite) obtains its food from the other …
Environment - Class 1: 11/10/2021
Environment: Ecology and its terms: Ecology is the study of the ecosystem. An ecosystem is a place where living (biotic) and non-living things (abiotic) exist and interact with each other. Levels of organization in ecology: Individual / Organism - individual living being that can act independently ( An adult organisms that can reproduce). Population - a group of organisms belonging to the same species living in the same area. Attributes of the population are birth rate (reproduction per time), the death rate (death per time) and sex ratio (…
