ncert.nic.in : ISC Biology Question Paper Model National Council Of Educational Research & Training
Board : National Council Of Educational Research & Training
Exam : ISC Biology
Document Type : Model Question Paper
Website : ncert.nic.in
Download Model/ Sample Question Papers : https://www.pdfquestion.in/uploads/6676-Boi.pdf
Model Question Paper for Class XII Biology :
MCQs Mark 01 :
Tick the correct statement
1. What would happen if corpus luteum is not degenerated (a) Progesterone will not be secreted
(b) Endometrium will disintegrate
(c) Proliferation of endometrium will take place
(d) Ovulation will take place
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2. Klinefelten syndrome has the genetic make up
(a) 44 autosomes + xxy
(b) 44 autosomes + xo
(c) 45 autosomes + xx
(d) 45 autosomes + xy
3. “Cleistogamous flowers are invariably autogamous because”
(a) These flowers do not open at all.
(b) There is no chance of cross – pollen landing on the stigma.
(c) These flowers have exposed anthers and stigma.
(d) These flowers are wind pollinated.
4. Which of the following statements is correct
(a) Surgical methods of contraception does not prevent gamete formation
(b) In E.T techniques, embryos are always transferred into the uterus
(c) Oral pills are very popular contraceptives among the rural women
(d) All STDs are not completely curable.
5. Non coding sequences present within a gene is called:
(a) Exon
(b) Operon
(c) Promoter
(d) Intron
6. Which of the following DNA sequences would a Restriction enzyme recognize and cut?
(a) ATGCAC TACGTG
(b) GATATC CTATAG
(c) TAGATA ATCTAT
(d) AATATA TTATAT
7. The conditions of the earth atmosphere conducive for the origin of life were:
(a) Presence of high temperature, CH4, NH3, and O3
(b) High temperature, CH4, NH3, volcanic eruption
(c) High temperature, volcanic eruption, O2, NH3
(d) Volcanic eruption, CH3, NH3 and O2
8. To analyse the genotype of an organism, it is made to
(a) Self cross
(b) Cross with recessive parent
(c) Cross with dominant parent
(d) Cross with another species
9. An inverted Pyramid of biomass is represented by
(a) Aquatic ecosystem
(b) ecosystem of a big tree
(c) grassland ecosystem
(d) tropical fresh ecosystem.
10. Gene therapy can be used to correct one of the following
(a) Defective ADA
(b) Lack of B-Lymphocytes
(c) Defective Immunoglobuline
(d) Lach of T-Lejmphocytes
MCQ Mark 02 :
Select the right options
11. Mycorrliza is an example of
(a) Commensalisms
(b) Mutualism
(c) Algal associated with fungi.
(d) Fungi associated with Higher Plants
12. Which of the followings are homologous or analogous (Indicate H for homologous and A for Analogous)
(a) Wing of bat and butterfly ________
(b) Wing of bat and flipper of whale ________
(c) Wing of butterfly and flipper of whale ________
(d) Flipper of whale and wing of bird ________
13. Read the statement if incorrect provide with correct answer ‘Sickle cell anemia’
(a) is a six linked disorder
(b) is due to a single base mutation of B globulin gene from GAG
(c) is inherited whose one of the parent is carrier and other normal
(d) changes shape of RBC from Round to concave.
14. Identify True/False statements. Correct each false statement to make it true
(a) Spermatozoa get nutrition from Sertoli cells. (True/False)
(b) Leydig cells are found in ovary. (True/False)
(c) Menstrual cycle ceases during pregnancy. (True/False)
15. The yellowish fluid colostrum secreted by mother during initial days of lactation has abundant antibodies to protect the infant. Tick the correct answer in Column A. and match the right choices in column B with the correct answer of column A.
Column A Column B
(i) IgE (a) Innate immunity
(ii) IgD (a) Acquired immunity
(iii) IgA (a) Active immunity
(iv) IgM (a) Passive immunity
SA Marks 02 :
16. Apomixis mimics sexual reproduction, do you agree? justify your answer. Also state how does apomixis differ from polyembryony.
17. How has biotechnology helped in improving life of Diabetic people?
18. Mention the role of histone proteins in packaging of DNA to form the structure of chromatin fibre.
19. Whith the help of a suitable example mention the role of microbes in
(a) Single cell protein
(b) Organic farming
20. Differentiate between
(a) Benign and Malignant tumours
(b) Viral oncogenes and protooncogenes