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

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SubjectBiology
Year2015 - 2016 (October)


Marks: 80
Q: 1 | Select and write the most appropriate answer from the given alternatives for each sub-question:[7]
Q: 1.1[1]

How many meiotic divisions will be needed to produce 44 female gametophytes in angiosperms?

(A) 11

(B) 22

(C) 44

(D) 66

view solution
Q: 1.2[1]

If the codon on m-RNA is AUG, the compatible anticodon on t-RNA is _______.

(A) UAG

(B) UAC

(C) GUA

(D) AUC

view solution
Q: 1.3[1]

_______ enzymes are used as biological scissors in r-DNA technology.

(A) Restriction endonucleases

(B) DNA ligases

(C) DNA polymerases

(D) Reverse transcriptases

view solution
Q: 1.4[1]

Vegetative propagation takes place with the help of leaves in _______ plant.

(A) Kalanchoe

(B) Oxalis

(C) Cynodon

(D) Dahlia

view solution
Q: 1.5[1]

Trichoderma konigi is a source of _______ enzyme.

(A) invertase

(B) lipase

(C) pectinase

(D) cellulase

view solution
Q: 1.6[1]

What is the correct sequence of the stages in bacteriophage lytic cycle?

(A) Attachment, Penetration, Lysis, Multiplication

(B) Attachment, Penetration, Multiplication, Lysis

(C) Lysis, Penetration, Multiplication, Attachment

(D) Attachment, Lysis, Multiplication, Penetration

view solution
Q: 1.7[1]

Edible fruiting bodies are produced by _______.

(A) Yeast

(B) Rhizopus

(C) Nostoc

(D) Agaricus

view solution
Q: 2[12]
Q: 2.1 | Answer each question in ‘One’ sentence only:[6]
Q: 2.1.1[2]

Give reason : Emasculation is done in a flower which is selected as female parent.

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Q: 2.1.2[2]

Label the parts (1) and (2) in budding of yeast cell.

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Q: 2.1.3[2]

Enlist types of DNA library.

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Q: 2.1.4[2]

Define parthenocarpy.

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Q: 2.1.5[2]

What is ecological succession?

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Q: 2.1.6[2]

Give the role of VAM related to soil fertility.

view solution
Q: 2.2[2]

Give diagrammatic representation of pyramid of numbers.

view solution
Q: 2.3 | Attempt any TWO of the following: [4]
Q: 2.3.1[2]

With the help of a suitable example, explain protandry.

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Q: 2.3.2[2]

How depletion of ozone layer affects living organisms?

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Q: 2.3.3[2]

Give graphic representation of cyclic photophosphorylation.

view solution
Q: 2.3.4[2]

Explain the role of microbes in sewage treatment.

view solution
Q: 3[9]
Q: 3.1 | Attempt any TWO of the following :[6]
Q: 3.1.1[3]

Describe the steps of PCR technique.

view solution
Q: 3.1.2[3]

Write a note on multiple alleles considering example of human blood groups.

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Q: 3.1.3[3]

What is ‘biofortification’?

Explain what is meant by biofortification.

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Which steps would you follow to develop a new variety of crop plant by selective breeding?

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Q: 3.2[3]

Sketch and label the T.S. of undehisced anther

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

Describe the process of glycolysis with the help of schematic representation.

view solution
Q: 4.2[7]

Explain semi-conservative replication of eukaryotic DNA.

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

Elephantiasis is caused by _______.

(A) Wuchereria bancrofti

(B) Plasmodium vivax

(C) Bedbug

(D) Elephant

view solution
Q: 5.2[1]

Genetically engineered human insulin is obtained by inserting the gene in _______.

(A) Pancreatic cells

(B) E. coli

(C) Agrobacterium tumefaciens

(D) Drosophila melanogaster

view solution
Q: 5.3[1]

Urea splitting bacteria are responsible for _______ types of stones.

(A) calcium oxalate

(B) calcium phosphate

(C) calcium carbonate

(D) struvite 

view solution
Q: 5.4[1]

The connecting link between ‘ape’ and ‘man’ is _______.

(A) Dryopithecus

(B) Australopithecus

(C) Homo erectus

(D) Homo neanderthalensis

view solution
Q: 5.5[1]

Crippling disease is caused due to poisoning of _______ .

(A) Arsenic

(B) Lead

(C) Mercury

(D) Selenium

view solution
Q: 5.6[1]

The genetic marker used as key factor in DNA fingerprinting is _______.

(A) VNTRs

(B) Exons

(C) Introns

(D) DNA probes

view solution
Q: 5.7[1]

The trophoblast cells in contact with embryonal knob are called _______ .

(A) Inner mass cells

(B) Blastomere

(C) Amniogenic cells

(D) Cells of Rauber

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

Mention any ‘two’ methods used to prevent spoilage of fish

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Q: 6.1.2[1]

Define the term ‘genome’.

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Q: 6.1.3[1]

Define organic evolution.

What is meant by organic evolution?

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Q: 6.1.4[1]

What is criss-cross inheritance?

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Q: 6.1.5[1]

Mention any ‘two’ functions of uterus.

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Q: 6.1.6[1]

What is Red Data Book?

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Q: 6.2[2]

Sketch and label the structure of chromosome.

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

Explain the concept ‘survival of the fittest’.

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Q: 6.3.2[2]

Give economic importance of apiculture

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Q: 6.3.3[2]

Give the importance of transgenic animals.

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Q: 6.3.4[2]

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

Describe T.S. of the spinal cord.

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Q: 7.1.2[3]

Explain the structure of antibody.

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Q: 7.1.3[3]

Give the effects of air pollutants on human health

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Q: 7.2[3]

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

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Q: 8 | Attempt any one of the following: [7]
Q: 8.1[7]

With the help of a labelled diagram describe the internal structure of human heart.

With the help of a suitable diagram, describe the conducting system of human heart

view solution
Q: 8.2[7]

Describe the stages during three trimesters of pregnancy. 

view solution

Explain the process of parturition.

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Add a note on lactation.

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