Presence of single defective X chromosome results in disorder. Women can develop this disorder if both the defective copies of X chromosome, which is rare. Diagram NCERT text book Fig 2.79d) and correct labeling ½ x3=1.5 Functional megaspore mother cell ½ Detailed explanation 1.5 Egg cell--- forms zygote & future embryo ½ Polar nuclei--- form PEN and provide nourishment ½ 29 to the embryo ½ Antipodals--- degenerate OR Ref. NCERT text book fig 3.11 Fallopian tube, zygote undergoes change to form blastomeres and develop 8-16 cell stage the morula, then 4+1=5 blastocyst- implantation I will deny in having drink in an assertive way to maintain 1 the friendship. Any 2 harmful effects; Affects nervous system Peptic ulcer 1 x 2=2 Hepatitis 30 Prevention and control Avoid undue peer pressure Seeking help from parents/ (any other correct two 1 x 2=2 points) BIOLOGY (Theory) CLASS –XII Blue Print Class (XII) S.NO. Type of VSA SA-II SA-I LA Total question (1 (2 (3 (5 → mark) marks) marks) marks) Units↓ 1 Sexual 2 (2) 4(2) 6(2) - 12(6) reproduction 2 Genetics & 2(2) 4(2) 9(3) 5(1) 20(8) Evolution
Presence of single defective X chromosome results in disorder. Women can develop this disorder if both the defective copies of X chromosome, which is rare. 29 Diagram NCERT text book Fig 2.79d) and correct labeling Functional megaspore mother cell Detailed explanation Egg cell--- forms zygote & future embryo Polar nuclei--- form PEN and provide nourishment to the embryo Antipodals--- degenerate OR Ref. NCERT text book fig 3.11 Fallopian tube, zygote undergoes change to form blastomeres and develop 8-16 cell stage the morula, then blastocyst- implantation ½ x3=1.5 ½ 1.5 ½ ½ ½ 4+1=5 30 I will deny in having drink in an assertive way to maintain the friendship. Any 2 harmful effects; Affects nervous system Peptic ulcer Hepatitis Prevention and control Avoid undue peer pressure Seeking help from parents/ (any other correct two points) 1 1 x 2=2 1 x 2=2 BIOLOGY (Theory) CLASS –XII Blue Print Class (XII) S.NO. Type of question → Units↓ VSA (1 mark) SA-II (2 marks) SA-I (3 marks) LA (5 marks) Total 1 Sexual reproduction 2 (2) 4(2) 6(2) - 12(6) 2 Genetics & Evolution 2(2) 4(2) 9(3) 5(1) 20(8)
1250565124study_material_of_class_xii_-biology,.docx