All of the above are used as biofertlizers.
A biofertilizer is a substance which contains living microorganisms which, when applied, colonize the rhizosphere or the interior of the plant and promotes growth by increasing the supply or availability of primary nutrients to the host plant.
There are five biofertilizers viz. Rhizobium, Azotobacter, Azospirillum, Phosphate Solubilizing Bacteria and mycorrhiza, which have been incorporated in India’s Fertilizer Control Order (FCO), 1985. Rhizobium, Azotobacter, Azospirillum and blue green algae (BGA) have been traditionally used as Biofertilizers. Blue green algae such as Nostoc, Anabaena, Tolypothrix and Aulosira fix atmospheric nitrogen.

1, 2 and 4 are correct.
Volcanic eruptions emit water vapour and toxic gases into the atmosphere such as carbon dioxide, sulphur dioxide, hydrogen sulphide, hydrochloric acid and carbon monoxide Breathing (or respiration, or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.
Photosynthesis takes in the carbon dioxide produced by all breathing organisms and reintroduces oxygen into the atmosphere. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms’ activities.
Decay of organic matter or putrefaction, process whereby heterotrophic organisms, including some bacteria, fungi, saprophytic plants, and lower animals, utilize the remains of once-living tissue as a source of nutrition. In the decomposition process, different products are released: carbon dioxide (CO2), energy, water, plant nutrients and re-synthesized organic carbon compounds.

Both the statements are correct.
The Global Tiger Initiative (GTI) was launched in 2008 as a global alliance of governments, international organizations, civil society, the conservation and scientific communities and the private sector, with the aim of working together to save wild tigers from extinction.
The GTI’s founding partners included the World Bank, the Global Environment Facility (GEF), the Smithsonian Institution, Save the Tiger Fund, and International Tiger Coalition (representing more than 40 non-government organizations). The initiative is led by the 13 tiger range countries (TRCs).

Statement 1 is incorrect while statement 2 is correct.
The Gravity Recovery and Climate Experiment, or GRACE is a joint mission under NASA & German Aerospace Centre.
Among its innovations, GRACE has monitored the loss of ice mass from Earth’s ice sheets, improved understanding of the processes responsible for sea level rise and ocean circulation, provided insights into where global groundwater resources may be shrinking or growing and where dry soils are contributing to drought, and monitored changes in the solid Earth.

Mucormycosis (previously called zygomycosis) is also known as Black Fungus infection. It is a serious but rare fungal infection caused by a group of molds called mucormycetes. These molds are present naturally in the environment.
The infection can occur in almost any part of the body. However, the infection is not contagious. This means that it cannot transmit between people or between people and animals.