Question Paper - Biology 2015 - 2016-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)



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Year2015 - 2016 (March)

Marks: 70
Q: 1 |  Select and write the most appropriate answer from the given alternatives for each sub-question[7]
Q: 1.1[1]

(i) The phenotypic ratio of incomplete dominance is _____________.

(a) 2 : 1

(b) 1 : 2 : 1

(c) 1 : 1 : 1

(d) 1 : 1 : 2

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Q: 1.2[1]

The number of purines in a segment of DNA molecule is 68. What will be the number of pyrimidines in this segment?

(a) 34

(b) 43

(c) 68

(d) 86

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Q: 1.3[1]

Alcoholic fermentation is brought about by _____________.

(a) Lactobacillus

(b) Saccharomyces

(c) Trichoderma

(d) Streptomyces

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Q: 1.4[1]

Which of the following is not a photosynthetic pigment?

(a) Carotene

(b) Xanthophyll

(c) Phycobillins

(d) Anthocyanin

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Q: 1.5[1]

Which one of the following is a stop codon?

(a) UAG

(b) UAC

(c) AUG

(d) UCA

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Q: 1.6[1]

Pyruvate undergoes oxidative decarboxylation to produce _____________.

(a) 2-PGA

(b) α-Ketoglutarate

(c) Succinyl-Co-A

(d) Acetyl-Co-A

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Q: 1.7[1]

Which day is observed as ‘World Environment Day’?

(a) 21st May

(b) 5 th June

(c) 25th September

(d) 13th December

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Q: 2[12]
Q: 2.1 | Answer in ‘one’ sentence only[6]
Q: 2.1.1[2]

What is test cross?

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Q: 2.1.2[2]

What is mycoherbicide?

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Q: 2.1.3[2]

What is Anticodon?

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Q: 2.1.4[2]

What is Humification?

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Q: 2.1.5[2]

How CO2 makes idlies puffy?

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Q: 2.1.6[2]

What is ecological succession?

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Q: 2.2[2]

Sketch and label the ‘Ultrastructure of Chloroplast’.

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Q: 2.3 | Answer the following (Any TWO)[4]
Q: 2.3.1[2]

Write a short note on ‘Mutational breeding’.

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Q: 2.3.2[2]

Enlist the advantages of Biogas

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Q: 2.3.3[2]

Explain ‘Carbon cycle’.

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Q: 2.3.4[2]

Give the floral adaptations for chiropterophily.

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Q: 3[9]
Q: 3.1 |  Answer the following (Any TWO):[6]
Q: 3.1.1[3]

Why the ratio in pleiotropy is 2 : 1? Explain it with example.

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Q: 3.1.2[3]

Give the schematic representation of TCA cycle.

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Q: 3.1.3[3]

Differentiate between cyclic and non-cyclic photophosphorylation.

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Q: 3.2[3]

Give diagrammatic representation to show a perfect pairing and any ‘two’

Wobble pairings.

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Q: 4 | Attempt any one of following :[7]
Q: 4.1[7]

What is double fertilisation? Describe the process in brief.

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Q: 4.2[7]

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

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Q: 5 | Select and write the most appropriate answer from the given alternatives for each sub-question[7]
Q: 5.1[1]

If centromere is situated in the middle of the chromosome, it is called ________.

(a) Metacentric

(b) Acrocentric

(c) Submetacentric

(d) Telocentric

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Q: 5.2[1]

Which one of the following is useful in treatment of burns and wound healing?

(a) Tissue plasminogen activator

(b) Tissue growth factor

(c) DNAse

(d) Bovine growth hormone

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Q: 5.3[1]

Erythroblastosis foetalis is caused when mother is ______.

(a) Rh+ve

(b) With antibody ‘A’

(c) Rh-ve

(d) With antibody ‘B’

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Q: 5.4[1]

Deposition of fatty substances in the lining of arteries results in ______.



(c) Hyperglycemia


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Q: 5.5[1]

Struggle between cow and cow for getting grass is called ________.

(a) Inter-specific struggle

(b) Environmental struggle

(c) Struggle against natural calamities

(d) Intra-specific struggle

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Q: 5.6[1]

In which type of adaptation, forelimbs are modified into wings?

(a) Aquatic adaptations

(b) Volant adaptations

(c) Arboreal adaptations

(d) Cursorial adaptations

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Q: 5.7[1]

Mating of two closely related individuals within the same breed is called ______.

(a) In-breeding

(b) Out-breeding

(c) Out-crossing

(d) Cross-breeding

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Q: 6[12]
Q: 6.1 |  Answer the following in ‘one’ sentence each:[6]
Q: 6.1.1[1]

Visit of a veterinary doctor to dairy farm is mandatory. Give reasons.

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Q: 6.1.2[1]

Why aquatic animals can afford to be ammonotelic?

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Q: 6.1.3[1]

Why PUC is mandatory for vehicles?

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Q: 6.1.4[1]

Define organic evolution.

What is meant by organic evolution?

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Q: 6.1.5[1]

Give the genotype of Turner’s syndrome.

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Q: 6.1.6[1]

Write down the full form of R.F.L.P.

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Q: 6.2[2]

Sketch and label T.S. of vein

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Q: 6.3 | Attempt any TWO of the following:[4]
Q: 6.3.1[2]

Give any ‘two’ factors responsible for genetic variation.

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Q: 6.3.2[2]

Give the name and function for ‘A’ and ‘B’ from the diagram given below

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Q: 6.3.3[2]

Write a note on ‘artificial acquired active immunity’.

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Q: 6.3.4[2]

Give the economic importance of ‘fisheries’

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Q: 7[9]
Q: 7.1 | Attempt any TWO of the following:[6]
Q: 7.1.1[3]

Explain sex determination in human beings.

How is sex determined in human beings?

Explain the mechanism of sex determination in human being

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Q: 7.1.2[3]

Describe steady population with the help of a pyramid.

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Q: 7.1.3[3]

Illustrate any ‘three’ genes which can be used in gene therapy.

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Q: 7.2[3]

Sketch and label ‘L.S. of human kidney’

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Q: 8[7]
Q: 8.1[7]

With the help of diagrammatic representation, explain the process of gametogenesis

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Q: 8.2[7]

 Describe the structure of cerebrum. Add a note on its function.

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