Students can feel more confident and clear about attempting the examination with the following useful tips: CBSE Class XII board examination 2019-2020: Biology

Biology emphasizes the underlying principles that are common to animals and plants as well as highlighting the relationship of Biology with other areas of knowledge.
Students are expected to understand discoveries and innovations in biology to everyday life such as environment, industry, health and agriculture.
Despite understanding and studying throughout the year, students often fail to score well. This is due to the fact that most students lose their confidence and feel nervous and anxious in the examination hall.
Sometimes pressure is so overwhelming that they tend to forget, whatever they have learned. But this does not have to be case. Students can feel more confident and clear about attempting the examination with the following useful tips shared by Biology teacher Shahnawaz Ansari.
Skill-wise weightage in Biology exam
Remembering- (Knowledge based Simple recall questions, to know specific facts, terms, concepts, principles, or theories, Identify, define, or recite, information): 10%
Understanding- (Comprehension - To be familiar with meaning and to understand conceptually, interpret, compare, contrast, explain, paraphrase information): 30%
 Application (Use abstract information in concrete situation, to apply knowledge to new situations, Use given content to interpret a situation, provide an example, or solve a problem): 30%
Evaluating & Analysis - Classify, Compare, Contrast, or differentiate between different pieces of information, Organize and/or integrate unique pieces of information from a variety of sources): 17%
Creating - (Appraise, judge, and/or justifies the value or worth of a decision or outcome, or to predict outcomes based on values): 13%
Examination pattern 
Question paper consists of 4 sections of total 70 marks.
• Section “A” consists of 5 questions of 1 mark each.
• Section “B” consists of 7 questions of 2 marks each.
• Section “C” consists of 8 questions of 3 marks each.
• Section “D” consists of valve based 3 questions of 5 marks each.
Marks allotted to each unit/chapter
Unit no. Name of unit         Weightage
Unit – I Reproduction         14 marks
Unit – II Genetics and evolution 18 marks
Unit – III         Biology and its application 14 marks
Unit – IV         Biotechnology and its application 10 marks
Unit – V Ecology and environment 14 marks
How to prepare for the subject:
• Pay attention and take good notes in class.
• Create your own study material.
• Have a positive attitude toward subject.
• Practice to draw labelled diagrams.
• Learn concepts from general to specific.
• Break down complex words into their roots.
Important topics for exam:-
(i) Sexual reproduction in flowering plants.
(ii) Reproduction in humans.
(iii) Mendel’s laws of inheritance.
(iv) Structure of DNA.
(v) Recombinant DNA technology.
(vi) Environmental issues.
(vii) Biodiversity and its applications.
(viii) Human diseases.
Important questions for Biology exam
(i) What measures as an individual? Would you take to reduce environmental pollution?
(ii) What is gene therapy? Illustrate using the example of adenosine de aminase (ADA) deficiency?
(iii) Mention any two autosomal genetic disorders with their symptoms?
(iv) What is parturition? Which hormones are involved in induction of it?
(v) Draw a well and labelled diagram of antibody molecule.
How to attempt the exam
• Stay calm before the exam.
• Read all questions carefully.
• Answer the easiest ones first.
• Review your answers thoroughly.
• Manage your time.
• Skim through the entire test before you start writing the answers.