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Assertion: Sanitary landfills is also not a good method for disposal of solid wastes. Reason: These landfills causes pollution of underground water resources due to seepage of chemicals.

Assertion: UV rays are highly injurious to living organism. Reason: DNA proteins of living organism preferentially absorb UV rays and its high energy breaks the chemical bonds within these molecules.

Assertion: Large area of thinned ozone layer particularly marked over the Antarctic region is known as ozone hole. Reason: CFCs causes ozone depletion.

Assertion: Deforestation may cause desertification. Reason: It causes, loss of biodiversity, disturbs hydrological cycle, causes soil erosion, may lead to desertification in extreme cases.

Assertion: UV-Radiation can cause skin cancer. Reason: UV-B can cause mutation in skin cell.

Assertion: Ozone in stratosphere is called good ozone. Reason: This ozone absorb UV-radiation coming from sun, thus act as shield.

Assertion: Integrated organic farming is cyclical zero waste procedure. Reason: In integrated organic farming waste product from one process is cycled as nutrients for other process.

Assertion: Irreparable computers and other electronic goods are known as electronic wasters (e-wastes) Reason: Recycling is the only solution for treatment of e-waste.

Assertion: Dry composting toilets reduce the need for chemical fertilizers. Reason: By composting method human excreta can be reduced into natural fertilizers.

Assertion: Sewage agriculture and industrial waste accelerate the process of eutrophication. Reason: Thus waste contains nitrates and phosphates, which acts as plant nutrient.