Multiple Choice QuestionsGiven below are some statements related to lower eumetazonas. Select the INCORRECT statement.
Ctenphores are diploblastic with radial symmetry
Placozonas, with weakly differentiated tissue layers, are not diploblasts
Cnidarians are diploblastic with typically two stages in their life cycle.
Hydrozonas, a Cnidarian class, often have colonial polyps in their life cycle
Based on the type of excretion of nitrogenous was, animals can be categorzied as ammonotelic, ureotelic and uricotelic. Given below are combinations of groups of organisms and type of excretion. Select the correct combination.
Poriferans, adult amphibians,cartilaginous fishes are ammonotelic
Ascaris, cockroaches, prawn are uricotelic
Paramecium, amphibian tadpoles, crocodiles are mainly ammonotelic
Humans, sharks and aquatic anurans are ureotelic
Basal angiosperms are NOT represented by the members of:
Chloranthales
Nymphaeales
Austrobaileyales
Amborellales
Which of the following is the correct increasing order for the daily net primary productivity (NPP) per unit leaf area in different ecosystems?
Deserts < Temperature forests < Tropical forests
Deserts < Tropical forests < Temperature forests
Temperature forests < Tropical forests < Deserts
Tropical forests < Temperature forests < Deserts
The equilibrium model of island biogeography proposed by MacArthur and Wilson assumes that the number of species on an island represents a blance between
Resource consumption rate and predation rate
Birth rate and death rate
Colonization rate and extinction rate
Specitation rate and hybridization rate
C.
Colonization rate and extinction rate
In MacArthur and Wilson's model, the equilibrium number of species on an island depends on the balance between rate of colonization and the rate of extinction. MacArthur and Wilson argued that the colonization rate should decrease as species number increases. Initially, any species reaching the island would be new to the island and therefore represent a colonization event. Eventually, the colonization rate should decrease until all the species found on the mainland are also found on island. If a species goes locally extinct on the island, then that species may again eventually recolonize the island, contributing again to the colonization rate. The extinction rate, howeve, should increase as species number increases. Initially, extinction rates are zero because there are no species to go extinct. However, as the number of species that can potentially go extinct will also increase, thereby increasing the possible extinction rate.
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