Biology – March 2016 HSC Maharashtra Board Paper
Maharashtra State Board
Class XII Biology
Board Paper – 2016
Time: 3 hrs Max. Marks: 70
- All questions are compulsory.
- Draw neat and labeled diagrams wherever necessary.
- Figures to the right indicate full marks.
- Answers to the questions in Section-I and Section-II should be written in two separate answer books.
- Questions from Section-I attempted in the answer book of Section-II and viceversa will not be assessed/not be given any credit.
- Answer to every new question must be started on a new page.
Q. 1. Select and write the most appropriate answer from the given alternatives for each sub-question: 
(i) The phenotypic ratio of incomplete dominance is _____________.
(a) 2 : 1
(b)1 : 2 : 1
(c) 1 : 1 : 1
(d)1 : 1 : 2
(ii) The number of purines in a segment of DNA molecule is 68. What will be the number of pyrimidines in this segment?
(iii) Alcoholic fermentation is brought about by _____________.
(iv) Which of the following is not a photosynthetic pigment?
(v) Which one of the following is a stop codon?
(vi) Pyruvate undergoes oxidative decarboxylation to produce _____________.
(vii) Which day is observed as ‘World Environment Day’?
(a) 21st May
(b)5 th June
(c) 25th September
Q. 2. 
(A) Answer in ‘one’ sentence only: (6)
(i) What is test cross?
(ii) What is mycoherbicide?
(iii) What is Anticodon?
(iv) What is Humification?
(v) How CO2 makes idlies puffy?
(vi) What is ecological succession?
(B) Sketch and label the ‘Ultrastructure of Chloroplast’. (2)
(C) Answer the following (Any TWO): (4)
(i) Write a short note on ‘Mutational breeding’.
(ii) Enlist the advantages of Biogas.
(iii) Explain ‘Carbon cycle’.
(iv) Give the floral adaptations for chiropterophily.
Q. 3. 
(A) Answer the following (Any TWO): (6)
(i) Why the ratio in pleiotropy is 2 : 1? Explain it with example.
(ii) Give the schematic representation of TCA cycle.
(iii) Differentiate between cyclic and non-cyclic photophosphorylation.
(B) Give diagrammatic representation to show a perfect pairing and any ‘two’
Wobble pairings. (3)
Q. 4. What is double fertilisation? Describe the process in brief. 
Define r-DNA technology. Give the basic steps in r-DNA technology and give any ‘three’ examples of the therapeutic products produced by r-DNA technology.
SECTION – II
Q. 5. Select and write the most appropriate answer from the given alternatives for each sub-question: 
(i) If centromere is situated in the middle of the chromosome, it is called ________.
(ii) Which one of the following is useful in treatment of burns and wound healing?
(a)Tissue plasminogen activator
(b)Tissue growth factor
(d)Bovine growth hormone
(iii) Erythroblastosis foetalis is caused when mother is ______.
(b)With antibody ‘A’
(d)With antibody ‘B’
(iv) Deposition of fatty substances in the lining of arteries results in ______.
(v) Struggle between cow and cow for getting grass is called ________.
(a) Inter-specific struggle
(c) Struggle against natural calamities
(vi) In which type of adaptation, forelimbs are modified into wings?
(c) Arboreal adaptations
(d) Cursorial adaptations
(vii) Mating of two closely related individuals within the same breed is called ______.
Q. 6. 
(A) Answer the following in ‘one’ sentence each: (6)
(i) Visit of a veterinary doctor to dairy farm is mandatory. Give reasons.
(ii) Why aquatic animals can afford to be ammonotelic?
(iii) Why PUC is mandatory for vehicles?
(iv) Define organic evolution.
(v) Give the genotype of Turner’s syndrome.
(vi) Write down the full form of R.F.L.P.
(B) Sketch and label T.S. of vein (2)
(C) Attempt any TWO of the following: (4)
(i) Give any ‘two’ factors responsible for genetic variation.
(ii) Give the name and function for ‘A’ and ‘B’ from the diagram given below:
(iv) Give the economic importance of ‘fisheries’.
(A) Attempt any TWO of the following: (6)
(i) Explain sex determination in human beings.
(ii) Describe steady population with the help of a pyramid.
(iii) Illustrate any ‘three’ genes which can be used in gene therapy.
(B) Sketch and label ‘L.S. of human kidney’ (3)
Q. 8. With the help of diagrammatic representation, explain the process of gametogenesis. 
Describe the structure of cerebrum. Add a note on its function.