Explain the observation of Alexander von Humboldt.

According to Alexander von Humboldt:

Which of the statement are in accordance with the observation of geographer Alexander von Humboldt ? I. Within a region species, richness increases with increasing explored area but within a limit. II. The relation between species richness and area is a rectangular hyperbola. III. The richness of species decreases with the increasing explored area. IV. There is no relation between the explored area and species richness .

Explain the following observation:

Explain the following observations

Write whether the following statements are true or false . (i) Communities with more species tend to be more stable that those with less species. (ii) David Tilman found that plots with less species showed less year-to-year variation in total biomass. (iii) A stable community must be resistant to invasions by exotic species. (iv) Effect of reduction in diversity has been explained by Alexander von Humboldt through rivet popper hypothesis.

(a) Explain the observations and the conclusion Darwin by during his visit to Galapagos Islands. (b) Write the two key concepts of Darwin's theory of natural selection.

Who confirmed communities with more species tend to be more stable than those with less species ? (a) Alexander von Humboldt (b) David Tilman (c) Paul Ehrlich (d) Edward Wilson

Match column I with column II and select the correct option from the given codes. {:("Column I",,"Column II"),("A) Rivet Popper hypothesis",(i),"Paul Ehrlich"),("B) Long-term ecosystem experiments using outdoor plots",(ii),"David Tilman"),("C) Species-area relationships",(iii),"Alexander von Humboldt"):} (a) A-(iii), B-(i), C-(ii) (b) A-(i), (ii), C-(iii) (c) A-(i), B-(iii), C-(ii) (d) A-(ii), B-(iii), C-(i)

Explain the following observations: o-and p-nitrophenols are more acidic than phenol.

Complete the following sentence using the appropriate option. X is the term popularized by Y , a Z to describe combined diversity at all the levels of biological organization. (a) X - Ecosystem , Y - Alexander von Humboldt , Z - Geologist (b) X - Biodiversity , Y - Edward Wilson , Z - Sociobiologist (c) X - Ecosystem , Y - Robert May , Z - Environmentalist (d) X - Ecology , Y - Gause , Z - Ecologist