As a natural product, cotton is completely biodegradable, which means that it breaks down when put into a composting pile or bin. Because of cotton's biodegradable properties, all-cotton clothing can also be recycled and used in the manufacture of useful materials, such as household insulation

Plastics is not environment friendly because it is non biodegradable and on burning it leaves poisonous gases.
Option D is correct.

These numbers are used to indicate whether the plastic can be recycled into new products or not.

Plastic is non biodegradable and also it take several thousands of years and also on burning it leave many poisonous gases.
Option D is correct.

Non-Biodegradable wastes cannot be recycled and they give out toxic substances and pollute the surroundings.

Plastic recycling is the process of recovering scrap or waste plastic and reprocessing the material into useful products, sometimes completely different in form from their original state.

Cotton is a natural fibre. It consists of natural components. . It is a renewable resource, the production requires little energy, Cotton takes 2 to 5 months to decompose.

Biodegradable compounds are compounds which get disposed through natural processes, such as action of bacteria. e.g peels of fruits, vegetables, paper.

Polystyrene (PS) is used for making disposable cups.
Polystrene is one of the most widely used kind of thermo plastic. It can be cast into moulds with fine detail.

Biodegradation is the disintegration of materials by bacterial, fungi or other biological means.

These substances are non-biodegradable which cannot be decomposed by microorganisms. These products do not break down naturally. When we dispose of them in a garbage pile, the air, moisture, climate, or soil cannot break them down naturally to be dissolved with the surrounding land. They are not biodegradable. However natural waste and products made from nature break down easily when they are disposed of as waste.

Plastic bags, because they are complex polymer of long chain hydrocarbons.It is non biodegradable. Plastic bags do not break down naturally. When we dispose them in a garbage pile, the air, moisture, climate, or soil cannot break them down naturally to be dissolved with the surrounding land. However natural waste and products made from nature break down easily when they are disposed as waste.

Most of the wandering animals eat plastic bags which take thousand of year to decompose and remain in the body of animals and become cause of death.

Non-biodegradable materials are those which do not decompose by natural processes. Non-biodegradable materials are generally synthetic polymers. They are not safe for the environment. Natural fibres degrade very easily in nature. However, non-biodegradable materials are made up of synthetic materials which are not broken down by micro-organisms.

Plastic containers are relatively dense and compact which enables them to be easily sorted mechanically, into the different types of plastics. Plastic film and bags are not easily mechanically sorted making them very costly to sort. Also, recycling such plastic is an expensive process.

Non biodegradable waste is waste that does not break down into natural components and exists in the environment for a long time. Examples would be tyres, plastics, electronic components, metals etc

Cotton mills  (cotton clothes) is an example of biodegradable.
Other biodegradable materials are paper, wood, peels of vegetable and fruits, leftover foodstuff, woollen clothes etc.
Non-biodegradable materials are plastic bags, tin, aluminium, and other metal cans.

Note : Biodegradable waste consists of plant and animal waste that is broken down by other living organism. It is produced in industries like cotton mills, food processing units, paper mills and textile factories.

Biodegradable waste consists of plant and animal waste that is broken down by other living organism, substances that are broken down by biological processes are said to be biodegradable. Biodegradable waste products can also be called green waste, food waste, or organic waste.

Plastics is burnt which releases toxic gases like Dioxins, Furans, Mercury and Polychlorinated Biphenyls into the atmosphere. Further, burning of Poly Vinyl Chloride liberates hazardous halogens and pollutes the air, the impact of which is climate change. The toxic substances thus released are posing a threat to vegetation, human and animal health and environment as a whole. These gases cause air pollution only.

Disposable plastic plates should not be used because its waste is non-biodegradable and cannot be broken down into its base compounds by micro-organisms, air, moisture or soil in a reasonable amount of time. Non-biodegradable waste is an environmental concern, as it threatens to overwhelm landfills and create disposal problems.

Hence, the correct option is $D$

Non-biodegradable products include plastic products, metal products, construction waste, electronics etc. Non-biodegradable products are items that cannot decay or be broken down by living organisms. The bio-degradable substances leach out toxic chemicals when they are burnt and are harmful to health.

Biodegradable substances are those materials or products that are able to naturally break down or decompose without causing any harm to the environment. Biodegradable substances are generally things that are organic in nature. This means they are substances that are made from things that were living at some point. Examples of biodegradable substances include paper which is made from trees, meat products which come from animals and leather products.

Not all synthetic polymers are biodegradable substances. Most of the synthetic polymers, including polythene and polypropene are not biodegradable.

Groundwater moves through soil and rocks, picking up pollution along the way. Plastic trash can affect groundwater quality, especially if you dispose of it improperly. It reduces the percolation of water as it comes in the way as water moves through soil.

A biodegradable substance is the one which gets decomposed by the natural processes. It can be also described by a the minor change in the organic molecule, fragmentation or we can say breaking of the complex molecule or the complete transformation of the organic molecule to the mineral form.

Plastics are not toxic when come in contact with food and medicines if they are synthesized according to permissible standards. Plastics are used world-over because they are safe for packaging of foods, medicines and child care products. A few examples are - milk pouches, edible oil container, ice-cream packs, blister packs for tablets and capsules. I.V. fluids and blood is collected and stored in plastic bags.

Plastic poses several environmental risks, including leaching chemicals and toxins into surrounding ecosystems, threatening the health of local animal populations and releasing greenhouse gases into the air. plastic are non-biodegradable. The negative effects of plastic vary depending on the type of plastic in the environment, quantity and length of exposure time. Plastics contain compounds, such as PVC and BPA, elements deemed a health risk to humans and animals while the leaching of these compounds into air and waterways poses a health and safety risk for nearby organisms.

Bullock cart is not made from paper. Book, notebooks, newspaper, toys, calenders are made from paper.

Activated sludge is about $97$% water. Sludge is the waste material produced by humans left during sewage treatment. Activated sludge process is the process of treatment of sewage and industrial waste. 

Incineration: A high temperature of above 1273K is required to convert the industrial, household and biological waste along with plentiful of oxygen supply into gases. Waste is converted into Carbon-dioxide and water 

Plasma is primarily an electrically charged or highly ionised gas. it produces temperature of $13000^0F$.
Waste molecular bonds are broken and the disposal provides renewable energy in plasma gasification.

Dumping or landfill focuses attention on burying the waste in the land. Dumping of waste is good for the soil as it contains compounds of nitrogen and phosphorous which acts as fertilizers.

Composting is a easy and natural bio-degradation process that takes organic matter i.e remains of plants, gardens and kitchen waste that turn into nutrient-rich food for the plants. it is usually used for organic farming by allowing the organic materials to sit in one place for months until microbes decompose it 

Recycling is a practice that refers to the collection and reuse of waste materials. The materials from which the items are made can be reprocessed into new products.
All the above are examples of Recycling.

Weeding is an important control method practiced in many crops. The removal of weeds is useful because these unwanted plants compete with the crop for space, water and nutrients.

Over the years, there have been various solutions proposed – diversion, burning, etc.; however, nothing to date has proven to be a truly effective or environmentally responsible solution to the burgeoning global landfill problem.