Mutualism is found in
hermit crab and sea anemone
ox pecker and rhinoceros
zoochlorellae and Hydra
E.coli and man
Photochemical smog formed in congested metropolitan cities mainly consists of:
ozone, peroxyacetyl nitrate and NOx
smoke, peroxyacetyl nitrate and SO2
hydrocarbons, SO2 and CO2
hydrocarbons, ozone and SOx
Assertion : Lateral line system is found in fishes and aquatic larval amphibians.
Reason : Lateral line system has receptors which are the clusters of sensory cells derived from ectoderm.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both the assertion and reason are false.
Which one of the following is a matching pair of certain organism(s) and the kind of association?
Shark and sucker fish - commensalism
Algae and fungi in lichens - mutualism
Orchids growing on trees - parasitism
Cuscuta (dodder) growing in other flowering plants - epiphytism.
Assertion : The age-sex structure of human population in countries like France and Germany gives a steep pyramid.
Reason : In countries like Sudan and India the population is increasing at a rapid rate.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Annual migration does not occur in the case of
Assertion : Inhabitants close to very busy airports are likely to experience health hazards.
Reason : Sound level of jet aeroplanes usually exceeds 160 dB.
If both Assertion and Reason are true and the reason is the correct explanation of the assertion
If both Assertion and Reason are true but the reason is not the correct explanation of the assertion
If Assertion is true statement but Reason is false
If both Assertion and Reason are false statements
On high mountains, difficulty in breathing is due to :
decrease in partial pressure of O2
decrease in amount of O2
increase in CO2 conc
all of the above
Mr.X is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying
first trophic leve
second trophic level
third trophic level
fourth trophic level