Methods of Waste Disposal:
Garbage management practices include method of disposing garbage with least effect on the environment.
Disposal of waste means to get rid of waste. This practice should be done in a scientific way.
Firstly the wastes should be segregated as biodegradable or non-biodegradable and recyclable material. This enables application of proper disposal treatment
There are various methods of waste disposal are as given below
(i) Recycling It is the processing of waste materials to form new products. Materials like tin, cans, metallic articles, rags, paper, glass, polythene, etc, are recyclable.
(ii) Composting Biodegradable domestic wastes, such as left-over food, fruit and vegetable peels, etc., can be buried in a pit, dug into ground. They are converted into compost and used as manure.

Snakes will have maximum concentration of harmful chemicals in its body.

Green plants are called 'producers' because they can produce food by photosynthesis in the presence of sunlight.

The harmful by products are gases such as SO₂ and NO. They cause extensive air pollution and are responsible for acid rain.

(a) Walking and cycling for commute.
(b) Using jute/cloth shopping bag.
(c) using public transport.
(d) Switching off light/fans in unoccupied rooms.

A pond or a lake has its own natural systems to maintain its ecosystem. Due to this, ponds or lakes normally do not need to be cleaned. An aquarium is a man-made ecosystem which has a very small space. The abiotic components are not supplied naturally to the aquarium. So, an aquarium needs frequent cleaning so that the living beings in it can survive.

Example of a food chain in the pond ecosystem:
Algae\(\rightarrow\)Small Fish/shrimp\(\rightarrow\)Medium Fish\(\rightarrow\)Large fish/crane/duck

Some of the harmful effects of agricultural practices on the environment are as follows:
Climate Change : As farming means growing a selected number of species on a large tract of land, it promotes monoculture. Thus farming affects the biodiversity of a region in a negative way.
Deforestation : Clearing of forests for agriculture has resulted in loss of habitat to wildlife. Deforestation has also affected the natural recharge process of ground water.
Soil degradation : Intensive farming robs off the soil of its nutrients. In the long run, it can lead to soil erosion and finally to desertification.
Water shortage : Over exploitation of groundwater for irrigation has resulted in acute water shortage at many places.
Pollution : Use of synthetic fertilisers and pesticides creates soil pollution, water pollution and air pollution.

Decomposers are the microorganisms that convert the dead remains of plant and animals to humus hence, help in cleaning the environment.
The two consequences of their absence in an ecosystem are
1. Accumulation of dead plants and animals.
2. Replenishment of soil nutrients will not take place.

The flow of energy in an ecosystem happens in following sequence:
Producer\(\rightarrow \) Primary Consumer\(\rightarrow \) Secondary Consumer\(\rightarrow \) Tertiary Consumer
The flow of energy is unidirectional in the food chain due to two reasons. A predator always eats its prey but other way round is not possible. Moreover, out of the total energy consumed by an organism at a particular trophic level; 90% is utilised for its own need and just 10% is left for the organism of next trophic level. Thus, the availability of energy gets reduced at subsequent trophic level. Due to this, the flow of energy is unidirectional in a food chain.