ppt on envirnment made by akanksha

Views:
 
     
 

Presentation Description

it includes voice .... u can remove it as it is not clear

Comments

Presentation Transcript

PowerPoint Presentation:

TODAY …. I Akanksha Jarwal of class X is going to present a power point presentation on ……

PowerPoint Presentation:

Environment

PowerPoint Presentation:

What is environment??? The physical and biological world where we live is called ENVIRONMENT. The environment includes our physical surroundings like air (atmosphere), water bodies, soil(land), and all the organisms such as plants, animals, human beings, and micro-organisms like bacteria and fungi ( called decomposers). All these constituents of the environment are dependent one another. Interact with one another and maintain a balance in the environment in a natural way.

PowerPoint Presentation:

ECOSYTEM !!! An  ecosystem is a community of living organisms (plants, animals and microbes) in conjunction with the non living components of their environment (things like air, water and mineral soil), interacting as a system.  These biotic and abiotic components are regarded as linked together through nutrient cycles and energy flows .  As ecosystems are defined by the network of interactions among organisms, and between organisms and their environment ,  they can be of any size but usually encompass specific, limited spaces

PowerPoint Presentation:

Components of an ecosystem Abiotic Biotic Producer Consumer Decomposer

PowerPoint Presentation:

Functioning of an ecosystem Energy, water, nitrogen and soil minerals are other essential abiotic components of an ecosystem. The energy that flows through ecosystems is obtained primarily from the sun. It generally enters the system through photosynthesis, a process that also captures carbon from the atmosphere. By feeding on plants and on one another, animals play an important role in the movement of matter and energy through the system. They also influence the quantity of plant and microbial biomass present. By breaking down dead organic matter, decomposers release carbon back to the atmosphere and facilitate nutrient cycling by converting nutrients stored in dead biomass back to a form that can be readily used by plants and other microbes.

PowerPoint Presentation:

FOOD CHAIN Every organism needs to obtain energy in order to live. For example, plants get energy from the sun, some animals eat plants, and some animals eat other animals. A food chain is the sequence of who eats whom in a biological community (an ecosystem) to obtain nutrition. A food chain starts with the primary energy source, usually the sun or boiling-hot deep sea vents. The next link in the chain is an organism that make its own food from the primary energy source -- an example is photosynthetic plants that make their own food from sunlight (using a process called photosynthesis) and chemosynthetic bacteria that make their food energy from chemicals in hydrothermal vents. These are called autotrophs or primary producers .

PowerPoint Presentation:

FOOD WEB A food web is a system of interconnected and interdependent food chains. It can also be defined as a network of food relationships through which nutrients and energy are passed from one living organism to another. It is network of numerous pathways along which the food (or energy) flows within grassland community. This food web starts from the producer(plant) and ends in top carnivore(animal). There are infinite food chain in a food web.

PowerPoint Presentation:

Trophic Level Trophic levels are the feeding position in a food chain such as primary producers, herbivore, primary carnivore, etc. Green plants form the first trophic level, the producers. Herbivores form the second trophic level, while carnivores form the third and even the fourth trophic levels. Energy pyramid shows the loss of energy from one trophic level to the next. An energy pyramid shows clearly that the energy transfer from one trophic level to the next is accompanied by a decrease due to waste and the conversion of potential energy into kinetic energy and heat energy. The energy pyramid is more widely used than the others because comparisons can be made between trophic levels of different ecosystem. It is, however, more difficult to compile an energy pyramid than it is compile the other types of pyramids.

PowerPoint Presentation:

The Ten percent law for the transfer of energy from one trophic level to the next was introduced by Lindeman (1942). According to this law, during the transfer of energy from organic food from one trophic level to the next, only about ten percent of the of energy from organic matter is stored as flesh. The remaining is lost during transfer, broken down in respiration, or lost to incomplete digestion by higher trophic levels.  Ten percent law

PowerPoint Presentation:

Ozone depletion The ozone layer is a concentration of ozone molecules in the stratosphere. About 90% of the planet's ozone is in the ozone layer. It is caused by the release of chlorofluorocarbons (CFCs), hydrofluorocarbons (HCFCs), and other ozone-depleting substances (ODS), which were used widely as refrigerants, insulating foams, and solvents. The discussion below focuses on CFCs, but is relevant to all ODS. Although CFCs are heavier than air, they are eventually carried into the stratosphere in a process that can take as long as 2 to 5 years. Measurements of CFCs in the stratosphere are made from balloons, aircraft, and satellites.

PowerPoint Presentation:

MANAGING THE GARBAGE WE PRODUCE Waste management is the collection, transport, processing or disposal, managing and monitoring of waste materials. The term usually relates to materials produced by human activity, and the process is generally undertaken to reduce their effect on health, the environment or aesthetics. Waste management is a distinct practice from resource recovery which focuses on delaying the rate of consumption of natural resources. All waste materials, whether they are solid, liquid, gaseous or radioactive fall within the remit of waste management. SOME IMPORTANT MODES OF WASTE DISPOSAL ARE : Recycling Preparation of compost Incineration Landfill Sewage treatment

authorStream Live Help