A.

germplasm

A germplasm is a collection of genetic resources for organisms. For plants, the germplasm may be stored as a seed collection.It includes diverse alleles of all the genes of an organism.

D.

location is not polluted

The situation suggests that the site is no polluted as lichens are the bioindicators for air pollution. These are the living organisms that respond in an especially clear way to a change in the environment. Te lichens are useful indicators of especially SO₂ pollution because they derive their water and essential nutrients mainly from the atmosphere rather than from the soil.

C.

critically endangered 

The extremely highest risk category assigned by the IUCN  Red List for wild species is critically endangered species. These are those species that are facing a very high risk of extinction in the wild. There are currently 2129 animals and 1821 plants which have been recorded in this category.

B.

Seed bank

Ex -situ or off-site conservation is the process of protecting endangered species fo plants and animals outside their natural habitat. This involves the conservation of genetic resources as well as species, Its example included seed banks, filed microbial culture collection, etc.

B.

the diversity in the organism living in the region

Biodiversity is the term popularised by the sociobiologist Edward Wilson to describe the combined diversity at all the levels of biological organisation. The most important of the are genetic diversity, species diversity and ecological diversity.