(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.
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Describe the structure of a nucleosome. (2)
Mention the evolutionary significance of the following organisms :
(c) Homo habilis
(d) Homo erectus VIEW SOLUTION
In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:VIEW SOLUTION
(a) White rust
(b) Leaf and stripe rust
(c) Black rot
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yiel. (2)
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(a) What precaution(s) would you recommend to a patient requiring repeated blood transfusion? (3)VIEW SOLUTION
(b) If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.
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'in-situ' Conservation can help endangered/threatened species. Justify the statement. (3)Name and describe any three causes of bio-diversity losses. VIEW SOLUTION
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.
Read the following statement and answer the questions that follow : (5)
"A guava fruit has 200 viable seeds."
(a) What are viable seeds?
(b) Write the total number of :
(i) Pollen grains (ii) Gametes
in producing 200 viable guava seeds.
(c) Prepare a flow-chart to depict the post-pollination events leading to viable-seed production in a flowering plant.
(a) Arrange the following hormones in sequence of their secretion in a pregnant woman.
(b) Mention their source and the function they perform :
hcG, LH, FSH, Relaxin 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.
(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
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