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SECTION - A 1. An infertile couple was advised to undergo In vitro fertilization by the doctor. Out of the options given below, select the correct stage for transfer to the fallopian tube for successful results? (a) Zygote only (b) Zygote or early embryo upto 8 blastomeres (c) Embryos with more than 8 blastomeres (d) Blastocyst Stage EXPLANATION:(b) Zygote or early embryo upto 8 blastomeres 2. Given below are four contraceptive methods and their modes of action. Select the  correct match: (a) a)–(i) b)–(ii) c)– (iii) d)–(iv) (b) a)–(ii) b)–(iii) c)–(iii) d) – (i) (c) a)–(iii) b)–(iv) c)–(ii) d)–(i) (d) a)–(iv) b)–(i) c)– (iii) d)–(ii) EXPLAINATION: (c) a) - iii, b) - iv, c) - ii, d) - i 3 Which of the following amino acid residues will constitute the histone core? (a) Lysine and Arginine  (b) Asparagine and Arginine (c) Glutamine and Lysine  (d) Asparagine and Glutamine EXPLANATION:(a) Lysine and Arginine 4 Evolutionary convergence is development of a (a) common set of fu...

SECTION -A 1.  The change in colour of the moist litmus paper in the given set-up is due to i. presence of acid ii. presence of base iii. presence of H⁺(aq) in the solution iv. presence of Litmus which acts as an indicator (a) i and ii (b) Only ii (c) Only iii (d) Only iv. EXPLANATION: (option c) litmus changes its colour in the presence of acids and bases hence act as an indicator. in the figure shown, HCl is liberated during the reaction of  NaCl and conc H2SO4 which turns blue litmus red ( acid of the solution has H+ ions) 2. In the redox reaction  MnO2 + 4HCl → MnCl2 + 2H2O + Cl2 (a) MnO2 is reduced to MnCl2& HCl is oxidized to H2O (b) MnO2 is reduced to MnCl2& HCl is oxidized to Cl2 (c) MnO2 is oxidized to MnCl2 & HCl is reduced to Cl2 (d) MnO2 is oxidized to MnCl2 & HCl is reduced to H2O EXPLANATION: (b) it is an example of redox reaction in which a substance which loses oxygen or gain hydrogen is reduced and which gain oxygen and loses hydrogen...

1. Humans have innate immunity to protect against pathogens that may enter the gut and food. What are the two barriers that protect the body from such pathogens? explanation: 1. skin- mechanical barrier retard entry of microbes. it has an acidic environment pH of about 3-5 which retards the growth of microbes. 2. mucous membrane: the conjunctivae and the alimentary respiratory and urogenital tract are lined by mucous membranes which wash away invading pathogens. mucous membrane release mucus which has antiviral and antibacterial substances. 2. A patient admitted to ICU was diagnosed to have suffered from myocardial infarction. The condition of the coronary artery is depicted in the image below. Name two bioactive agents and their mode of action that can improve this condition. OR Substantiate by giving two reasons why a holistic understanding of flora and fauna of the cropland is required before introducing an appropriate biocontrol method. explanation: to improve the patient's con...