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101.	Which are the different organs in body of organisms?
Answer» (i) In digestive system - (Mouth, Stomach,Liver, Pancreas, intestine, etc.) (ii) Skeletal system - (Bones) (iii) Circulatory system - (Heart, Arteries, Veins , etc.) (iv) Respiratory system - (Diaphragm, Lungs, Larynx, etc) are some of the organs in an organism.

102.	All the human reaces like Africans, Asians, Europeans, Americans and otgher might have evolved from a common ancestor. Provide a few evidences in support of this view.
Answer» There is no biological basis to the notion of human races. All humans are a single species irrespective of their race. All of them have a common body plan, structure, physiology and metabolism. All of them have a const~nt chromosome nu~ber, i.e., 46. Their genetic make up is also similar, almost 99.9% DNA 1s same in all humans. And also all the humans can freely inter-breed to produce offsprings. Not only this, study of evolution of human beings indicates that all of us come from Africa. The earliest members of the human qspecies, Homo sapiens can be traced there. All these evidences clearly indicates that all of us whether Africans, Asians Europeans or Americans, etc, have evolved from a common ancestor.

103.	The presence of which of the following types of organs in two organisms indicates that they are derived from the same ancestor ?A. analogous organsB. respiratory organsC. digestive organsD. homologous organs
Answer» Correct Answer - D

104.	One of the following has not been produced from wild cabbage by the process of artificial selection. This one is :A. kohlrabiB. cabbageC. spinachD. kale
Answer» Correct Answer - C

105.	The theory of natural selection was proposed by……………….A. MendelB. LamarckC. Charles darwinD. Hugo de Vries
Answer» Charles Darwin

106.	…………..proposed a model for protein synthesis with the help of DNA in bacterial cells.A. Johann Gregor MendelB. Walter and SuttonC. Francois Jacob and Jack MonadD. Hugo de Vries
Answer» Francois Jacob and Jack Monald

107.	There is evidence of fatal science among chordates.
Answer» (i) It is believed chordates have originated from invertebrates. (ii) It is difficult to find out from which invertebrate group the chordates were developed. (iii) Chordate ancestors were soft bodied animals, hence they were not preserved as fossils. (iv) Thus, there is evidence of fatal science among chordates.

108.	Similarities in characters: Morphological evidence :: similarities in structure of bonesand joints………………………
Answer» Anatomical Evidences -Similariites in characters and similarities is structure of bones and joints indicates similar origin with common ancestors.

109.	Triplet codon
Answer» The code for each amino acid consists of three nucleotides. It is called as Triplet codon.

110.	……………… a scientist of Indian origin discovered triplet codons for 20 amino acids.
Answer» Dr. Har Govind Khorana

111.	Ribosomes keeps moving from one end of mRNA to other end by the distance of one triplet codon. This is called as…………..
Answer» translocation

112.	……………………..: 1,50,000 years ago :: Cro-Magnon man : 50,000 years ago.
Answer» Neanderthal man -Cro-magnon man evolved about 50,000 yers ago whereas Neanderthal man evolved about 50,000 years ago whereas Neanderthal man evolved about 15,00,000 years ago.

113.	As per the message on mRNA, amino acids are supplied by tRNA. This is called as…………..A. TranscriptionB. TranslationC. TranslocationD. Transportation
Answer» Correct Answer - Translation

114.	The hereditary units are stretches of DNA calledA. chromosomesB. traitsC. charactersD. genes
Answer» Correct Answer - D

115.	……………. Brings in the coded message from the DNA.A. mRNAB. tRNAC. rRNAD. ribosomes
Answer» Correct Answer - m RNA

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