All of the above are correct.
Four major categories of ecosystem services: provisioning, regulating, cultural and supporting services.
Provisioning Services: A provisioning service is any type of benefit to people that can be extracted from nature. Along with food, other types of provisioning services include drinking water, timber, wood fuel, natural gas, oils, plants that can be made into clothes and other materials, and medicinal benefits.
Regulating Services: A regulating service is the benefit provided by ecosystem processes that moderate natural phenomena. Regulating services include pollination, decomposition, water purification, erosion and flood control, and carbon storage and climate regulation.
Cultural Services: A cultural service is a non-material benefit that contributes to the development and cultural advancement of people, including how ecosystems play a role in local, national, and global cultures; the building of knowledge and the spreading of ideas; creativity born from interactions with nature (music, art,
architecture); and recreation.
Supporting Services: Ecosystems themselves couldn’t be sustained without the consistency of underlying natural processes, such as photosynthesis, nutrient cycling, the creation of soils, and the water cycle.

Sources of pollution from POPs include the improper use and/or disposal of agrochemicals and industrial chemicals, elevated temperatures and combustion processes, and unwanted by-products of industrial processes or combustion.

1, 2 and 3 are correct.
Global Warming, fragmentation of habitat and invasion of alien species can be threats to the biodiversity of a geographical area.
Promotion of vegetarianism doesn’t threat biodiversity of geographical area.

1, 2, 3, 5 and 6 are correct.
Heptachor is an insecticide. Plutonium is radioactive and hence not used in day to day computer/electronic items.

2 and 3 are correct.
Phosphorous cycle is mainly terrestrial. The main storage for phosphorus is in the earth’s crust. On land phosphorus is usually found in the form of phosphates.
It occurs in large amounts as a mineral in phosphate rocks and enters the cycle from erosion and mining activities.
By the process of weathering and erosion phosphates enter rivers and streams that transport them to the ocean.
Being an important nutrient, phosphorous promotes eutrophication in lakes. Along with nitrogen related compounds it leads to undesirable situations like algal bloom.