Advertisements
Advertisements
प्रश्न
Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?
Advertisements
उत्तर
In general, species diversity decreases as we move away from the equator toward the poles.
The possible reason could be as follows:
- Temperature decreases as we move away from the equator towards the poles.
- The intensity of sunlight decreases as we move away from the equator towards the poles and hence productivity.
- In polar regions, the temperature is very low so most of the organisms cannot survive in that habitat.
APPEARS IN
संबंधित प्रश्न
The following graph shows the species-area relationship. Answer the following questions as directed.

(a) Name the naturalist who studied the kind of relationship shown in the graph. Write the observations made by him.
(b) Write the situations as discovered by the ecologists when the value of ‘Z’
(Slope of the line) lies between:
- 0.1 and 0.2
- 0.6 and 1.2
What does ‘Z’ stand for?
(c) When would the slope of the line ‘b’ become steeper?
The 'rivet' in the rivet popper hypothesis is considered to represent the ______.
Extent of global diversity of invertebrates is shown in the pie diagram below. Choose the most appropriate alternative that the four portions (a-d) represent.

Latitudinal and altitudinal gradient is shown by which of the following habitat(s)?
On a log scale the relationship of species richness and area becomes linear (straight line) and is given by the equation.
Maximum species richness is observed in the ______.
Select the correct alternative for x and y.

Which of these is true about tropical environments?
"Species richness increased with increased explored area but only a limit". This statement was given by.
Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?
There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.
Given below is an equation describing the Species-Area relationship between species richness and area for a wide variety of taxa as angiosperm plants, birds, bats etc. S = CAz
- Give a graphical representation of the given equation showing Species-Area relationship.
- What does 'S' represent in the given equation?
- What is the value of 'Z' (regression coefficient) for frugivorous birds and mammals in the tropical forests of different continents?
Write the inference drawn by Alexander von Humboldt after his extensive explorations of South American jungle.
Study the graph given below:

As per Alexander von Humboldt, what do the symbols S, A, Z and C in the graph stand for, in respect of a species and area relationship?
The species-area relationship is represented on a log scale as ______.
Distribution of diversity on earth shows that biodiversity from higher latitudes to lower latitudes ______.
The relation between species richness and area for a wide variety of taxa appears as ______.
Alexander von Humboldt observed that, within a region species richness ______ with increasing explored area.
Who observed that within a region, species richness increased with increasing explored area, to a certain limit?
