Class 12th Biology 2012 Set2 Delhi Board Paper Solution
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Q1 Cucurbits and papaya plants bear staminate and pistillate flowe...
Q2 A garden pea plant (A) produced inflated yellow pod, and anothe...
Q3 Write what do phytophagous insects feed on.
Q4 What is the interaction called between cuscuta and shoe flower ...
Q5 When do the oogenesis and the spermatogenesis initiate in human...
Q6 How does smoking tobacco in human lead to oxygen deficiency in ...
Q7 State the significance of the study of fossils in evolution.
Q8 Name the following: (a) The semi-dwarf variety of wheat ...
Q9 (a) Highlight the role of thymus as a lymphoid organ. (b...
Q10 Why do clown fish and sea anemone pair up? What is this relatio...
Q11 Some organisms suspend their metabolic activities to survive in...
Q12 (a) State the role of DNA ligase in biotechnology. (b) ...
Q13 Draw a schematic diagram of a part of double stranded dinucleot...
Q14 Name the parasite that causes filariasis in human. Mention its ...
Q15 Name the source of streptokinase. How does this bio-reactor mol...
Q16 (a) State the difference between meiocyte and gamete with re...
Q17 Explain the work carried out by Cohen and Boyer that contribute...
Q18 Where is sporopollenin present in plants? State its significanc...
Q19 Write the function of each of the following (a) Middle piec...
Q20 Given below is the representation of amino acid composition not...
Q21 Draw a schematic sketch of pBR 322 plasmid and label the follow...
Q22 It is established that RNA is the first genetic material. Expla...
Q23 Study a part of the life cycle of malarial parasite given below...
Q24 State the theory of Biogenesis. How does Miller’s experiment su...
Q25 Name the genes responsible for making Bt cotton plants resistan...
Q26 How does an algal bloom cause eutrophication of a water body? N...
Q27 Name the two different categories of microbes naturally occurri...
Q28 (a) Draw a pyramid of numbers of a situation where a large popu...
Q29 What is the inheritance pattern observed in the size of starch ...
Q30 The following is the illustration of the sequence of ovarian ev...
Question 7
State the significance of the study of fossils in evolution.
Answer
Study of fossils indicates the geological period in which various life forms were arisen. The calculation of geological period can be done via radioactive dating.
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