CBSE
Multiple Choice QuestionsAssertion : Old age is not an illness. It is a continuation of life with decreasing capacity for adaptation.
Reason : Cessation of mitosis is a normal genetically programmed event.
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
Assertion: From evolutionary point of view, human gestation period is believed to be shortening.
Reason: One major evolutionary trend in humans has been the larger head undergoing relatively faster growth rate in the foetal stage.
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.
The pioneers in the field of 'organic evolution' are:
Karl Landsteiner, Hugo de Vries, Malthus
Darwin, Hugo de Vries, Lamarck, Huxley
Lamarck, Karl Landsteiner, Malthus, Hugo de Vries
Darwin, Lamarck, Karl Landsteiner, Hugo de Vries
Assertion: Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits.
Reason: Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.
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.
A force which acts against the achievement of highest possible level to population growth is known as
population pressure
saturation level
carrying capacity
environmental resistance
Assertion : Holoblastic cleavage with almost equal-sized blastomeres is a characteristic of placental animals.
Reason : Eggs of most mammals, including humans, are of centrolecithal type.
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
Assertion : Organochlorine pesticides are organic compounds that have been chlorinated.
Reason : Fenitrothion is one of the organochlorine pesticides.
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
Assertion : Bats and whales are classified as mammals.
Reason : Bats and whales have four-chambered heart.
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
Prototherians are the connecting links between:
amphibians and aves
reptiles and mammals
fishes and amphibians
reptiles and amphibinas
Assertion : All birds, except the ones like koel (cuckoo) build nests for retiring and taking rest during night time (day time for nocutrnal).
Reason : Koel lays its eggs in the nests of tailor bird.
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
