CBSE
Multiple Choice QuestionsMr.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
Which of the following statements is incorrect
Lichen, an association of fungus and algae is an example of mutualism.
Those epiphytes which use other plants for support only and not for water or food supply and are examples of commensalism.
Sea-anemone on hermit-crab is an example of protocooperation.
Mutualism, protoocoperation, commensalism cannot be included under symbiosis.
Assertion: Koel does not build nest for egg laying.
Reason: Koel lays its eggs in the nest of tailor bird.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is falsen
If both assertion and reason are false.
Monarch butterfly escapes from predators by
foul smell
bitter taste
colour combination
rough skin
Eugenics is the branch concerned with
improving the quality of human race by symptomatic treatment of genetic diseases.
improving the quality of human populations by the application of genetic principles
improving the quality of human race by providing best suitable environment.
none of the above
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.
Which part of the world has a high density of organism?
Deciduous forests
Grasslands
Tropical rain forests
Savannahs
Assertion : All pathogens are parasites but all parasites are not pathogens.
Reason : Majority of the parasites confer benefits to the host.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
What are labelled phases A, B and C in given sigmoidal growth curve.
| A | B | C |
| stationery | Log | Lag |
| A | B | C |
| Lag | stationery | Log |
| A | B | C |
| Log | Lag | stationery |
| A | B | C |
| Lag | Log | stationery |
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
