Fig trees (genus Ficus) are considered sacred in India, East Asia and Africa and are common in agricultural and urban landscapes where other large trees are absent. In natural forests, fig trees provide food for wildlife when other resources are scarce and support a high density and diversity of frugivores (fruit-eating animals). If frugivorous birds and bats continue to visit fig trees located in Sites with high human disturbance, sacred fig trees may promote frugivore abundance. Under favourable microclimate, plenty of seedings of other tree species would grow around fig trees.

Correct Option (A)

Assumptions 1 and 2 are valid based on the provided passage.

Assumption 1: Fig trees can often be keystone species in natural forests. The passage states that fig trees provide food for wildlife when other resources are scarce and support a high density and diversity of frugivores. This ecological role, particularly their critical contribution during periods of scarcity and their support for a diverse group of consumers, is characteristic of a keystone species, which has a disproportionately large impact on its ecosystem's structure and function.

Assumption 2: Fig trees can grow where other large woody species cannot grow. The passage mentions that fig trees are common in agricultural and urban landscapes where other large trees are absent. This implies their adaptability and ability to thrive in conditions or environments where other large woody species may not be able to establish or persist.

Incorrect Options:

Assumption 3: Sacred trees can have a role in biodiversity conservation. The passage indicates that "sacred fig trees may promote frugivore abundance" in disturbed sites. While promoting frugivore abundance contributes to biodiversity, the passage does not explicitly state a general role for "sacred trees" in broader biodiversity conservation beyond this specific function. The statement about "plenty of seedlings of other tree species would grow around fig trees" is attributed to "fig trees" generally, not specifically "sacred trees," and is linked to favourable microclimate rather than a direct conservation role of the sacred aspect.

Assumption 4: Fig trees have a role in the seed dispersal of other tree species. The passage states that "plenty of seedlings of other tree species would grow around fig trees" under favourable microclimate. However, this does not explicitly confirm that fig trees themselves facilitate the seed dispersal of these other species. The growth of seedlings around fig trees is presented as a consequence of a favourable microclimate, not necessarily a direct function of fig trees in dispersing seeds of other species.