The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

Which of the five common ancestors, labeled V—Z, has given rise to the greatest number of species, both extant and extinct?

TLS Online TPP Program

#Question id: 10719

#Section 1: Ecology

Five Hypotheses Explain How Species Richness Affects Community Services, Following statement are given

A) Community services decline with decreased species richness in a stepwise fashion.

B) Species that play the same roles in a community can compensate for each other if some are lost under particular conditions

C) Species richness declines even slightly from its natural levels, community services are reduced immediately

D) Community services change as the number of species increases or decreases, but that the direction of change is not predictable.

TLS Online TPP Program

#Question id: 10720

#Section 1: Ecology

What is the Jaccard index between the two communities?

TLS Online TPP Program

#Question id: 10721

#Section 1: Ecology

Which above spp having decrease order of abundance?

TLS Online TPP Program

#Question id: 10722

#Section 1: Ecology

Community 1 contains 100 individuals distributed among four species (A, B, C, and D). Community 2 contains 100 individuals distributed among three species (A, B, and C). Community 1: 5A, 5B, 85C, 5D Community 2: 30A, 40B, 30C Calculate the Shannon diversity (H) for each community.

TLS Online TPP Program

#Question id: 10723

#Section 1: Ecology

What does the graph tell you about the effect of a keystone species?

TLS Online TPP Program

#Question id: 10725

#Section 1: Ecology

While studying the diversity of 3 communities, 5 species and 50 individuals were recorded from each community. The number of individuals under each species was listed as mentioned in the following Table.  

Which of the following is decreasing order of evenness of community?