18937.Community is
Species structure and diversity index of an area
Biomass
Autotrophic and heterotrophic components
All of these
18938.A terrestrial animal must be able to
Excrete large amounts of salts in urine
Actively pump salts out through the skin
Conserve water
Excrete large amount of water in urine
18939.Which one of the following is categorized as a parasite in true sense?
The cuckoo lays its egg in crow's nest
The female Anopheles bites and sucks blood from humans
Human foetus developing inside the uterus draws nourishment from the mother
Head louse living on the human scalp as well as laying eggs on human hair
18940.Adaptation to low temperature and freezing in animals occurs due to the production of
Chaperonins
Proline
Antifreeze
Alanine
18941.The maximum amount of water that a soil can hold, by capillary action is called
Wilting point
Water potential
Field capacity
Osmotic potential
18942.An association of individuals of different species living in the same habitat and having functional interactions is
Biotic community
Ecologic niche
Population
Ecosystem
18943.Animals that have adapted themselves to live in deserts are known as
Fossorial
Xerocoles
Arboreal
Terrestrial
18944.In ecological succession from pioneer to climax community, the biomass shell
No relation
Increase and then decrease
Decrease
Increase continuously
18947.Association between sea Anemone and Hermit crab in gastropod shell is that of
Parasitism
Commensalism
Symbiosis
Amensalism
18948.Biotic potential is increase in population under
Optimum conditions
Climatic conditions
Natural conditions
Given conditions
18950.Which of the followings is not the characteristic of the anatomy of xerophytes?
Well developed conducting tissue
Spongy parenchyma
Thick cuticle
Well developed mechanical tissue
18951.Competition is most severe between two
Distantly related species growing in the same habitat
Closely related species growing in the same habitat
Closely related species growing in different niches
Distantly related species growing in different niches.
18953.Nicotine functions as stimulant because it facilitates release of
Adrenaline
Thyroxine
Dopamine
Testosterone
18954.When one animal copies the appearance, actions, or sounds of another animal to avoid predators, it is called
Mimicry
Commensalism
Competition
Symbiosis
18956.The abundance of a species population within its habitat is called
Relative density
Regional density
Absolute density
Niche density