(c) Isolation of genetic materialIsolation of the genetic material is the first step in genetic engi...

(d) Agrobacterium tumefaciensAgrobacterium is widely used in genetic engineering in plants as its Ti...

(d) Complementary DNAComplementary DNA is DNA synthesized from a single stranded RNA in a reaction c...

(b) Extra chromosomal materialExtrachromosomal DNA in bacteria is called plasmid and nucleoid materi...

(d) CosmidsCosmids are suitable for cloning long DNA fragments.

(b) EndonucleasesEndonucleases enabled niotechnologists to carry on research in their fields as thes...

(d) SplicingSplicing is the technique of joining DNA fragments

(a) Plasmids are small, circular DNA molecules that can integrate with host chromosomal DNA

(d) PlasmidsPlasmids carry genes for antibiotic resistance.

(c) Esherichia eoliBacteria have plasmids.

(b) Southern blotting

(d) Only (a) and (b) are correct.Biotechnology is employed to produce vaccines and human gene produc...

(c) MigrationMigration results in decreasing the population has organisms move from one place to ano...

(b) Modification and speciationEvolution results in natural selection of modified organisms and sele...

(d) Extra abdominal musclesExtra abdominal muscles are the vestigial organs in man.

(a) Wings of butterfly, house fly and batWings of butterfly, housefly and bat are used for flying bu...

(c) Similar origin but dissimilar functionsHomologus organs have same structure and function but dis...

(b) Eihohippus from EioceneProf. Marsh named the first fossil remains of the horse found in North Am...

(c) PetrifiedReplacement of organic parts by mineral depositsis called petrifiction. Fossils formed ...

(c) Palaearctic and OrientalSclatter in 1857 recognised six zoogeographical regions on the basis of ...

(d) 300 million years agoCarboniferous is a geological period in the Paleozoic era. It began about 3...

(d) Radioactive carbon contentBy radioactive carbon dating, one can ascertain the age of fossils.

(a) OparinOparin was the Russian scientists who proposed the theory of origin of life .

(d) The early atmosphere had significant quantities of methane and ammonia.The early atmosphere was ...

(c) Organisms arose abiogeneticallyAs per spontaneous generation, organisms arose from dead and deca...

(a) RecapitulationFrog tadpole recapitulates the phylogeny.

(a) Different selection pressureDifferent selection pressure will be able to balance genetic diverge...

(a) Convergent evolutionThese organs are called analogus organs and represent convergent evolution.

(c) Ontogeny recapitulates phylogenyAn organism from the time of its embryo stage will show the feat...

(d) AppendixVermiform appendix is a vestigial organ in man.

(d) All of the aboveVestigial organs can be considered as evidence of evolution because vestigial st...

(a) 220 million years agoMammals first appeared 220 million years ago. The earliest known mammals we...

(b) PrecambrianPrecambrian is the time from the formation of earth upto 570 million years ago. It co...

(a) Amino acidsUrey and Miller in their electric discharge experiments discovered the formation of a...

(a) Fossil X was found in deeper sedimentation.Older fossils are always found at the bottom and newe...

(b) PaleontologyPaleontology is the study of fossils. Paleobotany is the study of fossil plants Anat...

(b) Dead animal of the pastFossils are dead animals of the past that were preserved by nature.

(c) Prokaryotic heterotrophsThe first forms were heterotrophs without a well defined nucleus and wer...

(b) J.B.S.Haldane

(d) 15 billionThe Big bang theory is the dominant scientific theory about the origin of universe. Ac...

(d) OxygenOxygen was absent when life originated on the earth. The first life forms were anaerobes.

(a) 4.6 billion years agoEarth originated 4.6 billion years ago.

Solution :To prove $P(n) PQ^n=Q^nP \qquad n \in N$$P(1) => PQ^1=Q^1P$ given $PQ =QP$Hence it is t...

Solution :Since $PQ$ is congruent to $AB$ and $AB$ is. Congruent to $CD$, by property of transitivit...

Solution :https://clay6.com/mpaimg/jee5.jpg

Solution :Aqueousis neutral hence there is no reaction between ethyl acetate and aqueous.

Solution :DDT is prepared by heating chlorobenzene and chloral with concentrated sulphuric acid.

Solution :In DNA, four bases have been found. They are adenine (A), guanine (G), cytosine (C) and th...

Solution :Electron withdrawing group increases the acidity of benzoic acid, o - isomer will have hig...

Solution :Aqueousis neutral hence there is no reaction between ethyl acetate and aqueous.