(i) There are a total of 26 questions and five sections in the question paper, All questions are compulsory.
(ii) Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
(iii) Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
(iv) Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
(v) Section D contains question number 23, Value Based Question of four marks.
(vi) Section E contains question number 24 to 26, Long Answer type questions of five marks each.
(vii) There is no overall choice in the question paper, however, an internal choice is provided in one question of two marks, one question of three marks and all three questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
- Q1VIEW SOLUTION
- Q2VIEW SOLUTION
- Q3VIEW SOLUTION
- Q4VIEW SOLUTION
- Q5VIEW SOLUTION
- Q6VIEW SOLUTION
- Q7VIEW SOLUTION
- Q8VIEW SOLUTION
- Q9VIEW SOLUTION
Describe the structure of a nucleosome. (2)
Mention the evolutionary significance of the following organisms :
(c) Homo habilis
(d) Homo erectus VIEW SOLUTION
- Q11VIEW SOLUTION
'in-situ' Conservation can help endangered/threatened species. Justify the statement. (3)Name and describe any three causes of bio-diversity losses. VIEW SOLUTION
- Q13VIEW SOLUTION
- Q14VIEW SOLUTION
- Q15VIEW SOLUTION
- Q16VIEW SOLUTION
- Q17VIEW SOLUTION
- Q18VIEW SOLUTION
- Q19VIEW SOLUTION
- Q20VIEW SOLUTION
- Q21VIEW SOLUTION
A group of youth were having a 'rave party' in an isolated area and was raided by police. Packets of 'smack' and syringes with needles were found littered around. (3)VIEW SOLUTION
(a) Why is taking 'smack' considered an abuse?
(b) Write the chemical name of 'smack' and the name of its source plant.
(c) Syringes and needles used by the youth for taking the drug could prove to be very fatal. Why?
Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organized an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate. (4)VIEW SOLUTION
(a) How would you justify your arguments that promote burying and discourage burning? (Give two reasons)
(b) With the help of flow charts, one for each practice depict the chain of events that follow.
(a) What is an age-pyramid?
(b) Name three representative kinds of age-pyramids for human population and list the characteristics for each one of them.
Discuss the role of healthy ecosystem services as a pre-requisite for a wide range of economic, environmental and aesthetic goods and services. VIEW SOLUTION
Read the statement and answer the questions that follow. (5)
A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.
(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.
(b) Describe the development of a dicot embryo in a viable seed.
(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.
(a) Name the hormones secreted and write their functions :
(i) by corpus luteum and placenta (any two).
(ii) during Follicular phase and parturition.
(b) Name the stages in a human female where :
(i) Corpus luteum and placenta co-exist.
(ii) Corpus luteum temporarily ceases to exist. VIEW SOLUTION
State and explain the "law of independent assortment" in a typical Mendelian dihybrid cross. (5)
(a) How do the observations made during moth collection in pre- and post- industrialized era in England support evolution by Natural Selection?VIEW SOLUTION
(b) Explain the phenomenon that is well represented by Darwin's finches other than natural selection.
Board Papers 2014, Board Paper Solutions 2014, Sample Papers for CBSE Board, CBSE Boards Previous Years Question Paper, Board Exam Solutions 2014, Board Exams Solutions Maths, Board Exams Solutions English, Board Exams Solutions Hindi, Board Exams Solutions Physics, Board Exams Solutions Chemistry, Board Exams Solutions Biology, Board Exams Solutions Economics, Board Exams Solutions Business Studies, Maths Board Papers Solutions, Science Board Paper Solutions, Economics Board Paper Solutions, English Board Papers Solutions, Physics Board Paper Solutions, Chemistry Board Paper Solutions, Hindi Board Paper Solutions, Political Science Board Paper Solutions, Answers of Previous Year Board Papers, Delhi Board Paper Solutions, All India Board Papers Solutions, Abroad/Foreign Board Paper Solutions, cbse class 12 board papers, Cbse board papers with solutions, CBSE solved Board Papers, ssc board papers.