Which of the following is not a reason that accounts for greater biodiversity of tropics?

1. availability of more solar energy
2. more niche specialization
3. more time for species diversification
4. large seasonal variations in environmental factors

The greatest biodiversity on the earth is found in
1. African grasslands
2. Amazonian rain forest in South America
3. Western Ghats in India
4. Nile delta in Egypt

The relation between species richness and area for a wide variety of taxa on a logarithmic scale is a:

1. rectangular hyperbola

2. straight line

3. sigmoid curve

4. sine curve

Alexander von Humbolt described for the first time 
1. ecological biodiversity

2. law of limiting factor

3. species area relationships

4. population growth equation 

Presence of plants arranged into well defined vertical layers depending on their height can be best seen in

(1) tropical savannah

(2) tropical rain forest

(3) grassland

(4) temperate forest

Large woody vines are more commonly found in

1. mangrooves

2. tropical rainforests

3. alpine forests

4. temperate forests

Which part of the world has a high density of organism?

1. Deciduous forests

2. Grasslands

3. Tropical rain forests

4. Savannahs

Select the correct statement about biodiversity.
 

The species diversity decreases from lower to higher altitudes on a mountain. This is due to
(1) increase in temperature

(2) decrease in temperature

(3) greater seasonal variability

(4) Both (b) and (c)

Which of the following rain forest is home to more than 40,000 species of plants, 3,000 of fishes, 1,300 of birds, 427 of mammals, 427 of amphibians, 378 of reptiles and more than 1,25,000 invertebrates?

1. Amazonian

2. Tropical

3. Arctic tundra

4. Temperate