The early stage human embryo distinctly possesses
gills
gill slits
external ear (pinna)
eye brows
B.
gill slits
Both chick and human embryos go through a stage where they have slits and arches in their necks like the gill slits and gill arches of fish. These structures are not gills and do not develop into gills in chicks and humans, but the fact that they are so similar to gill structures in fish at this point in development supports the idea that chicks and humans share a common ancestor with fish. Thus, developmental characters, along with other lines of evidence, can be used for constructing phylogenies.
Assertion : Comparative biochemistry provides a strong evidence in favour of common ancestry of living beings.
Reason : Genetic code is universal
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
Assertion: Animals adopt different strategies to survive in hostile environment.
Reason: Praying mantis is green in colour which merges with plant foliage
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.
DNA is present in
chromosomes and dictyosomes
chloroplasts and lysosomes
mitochondria and chloroplasts
mitochondria and endoplasmic reticulum.
If the Bengal Tiger becomes extinct
hyenas and wolves will become scars
the wild areas will be safe for man and domestic animals
its gene pool will be lost forever
the populations of beautiful animals like deers will get stabilized.
Assertion: Among the primates. chimpanzee is the closest relative of the present day humans.
Reason: The banding pattern in the autosome numbers 3 and 6 of man and chimpanzee is remarkably similar.
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.
Assertion : Darwin's finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds.
Reason : Ancestral seed-eating stock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitorfree new habitats.
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.
Assertion : Human ancestors never used their tails and so the tail expressing gene has disappeared in them.
Reason : Lamarck's theory of evolution is popularly called theory continuity of germ plasm.
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
Assertion: Coaccrvates are believed to be the precursors of life.
Reason: Coaccrvates were self-duplicating aggregates of proteins surrounded by lipid molecules
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.
Potato and sweet potato
have edible parts which are homologous organs
have edible parts which are analogous organs
have been introduced in India from the same place
are two species of the same genus.
