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Biology Set 1 2017-2018 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology [Set 1]
Marks: 70Academic Year: 2017-2018
Date: July 2018

[7]1
[1]1.A

Select and write the most appropriate answer from the given alternatives for the following subquestion: 

In an octamer of the nucleosome, core DNA consist of ______ base pairs

46

146

246

346

Concept: Structure of DNA and RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[1]1.B

Select and write the most appropriate answer from the given alternatives for the following subquestion: 

A versatile anther is an adaptation for _______ type of pollination. 

anemophilous

entomophilous 

hydrophilous

ornithophilous

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [5.01] Reproduction in Plants
[1]1.C

Select and write the most appropriate answer from the given alternatives for the following subquestion: 

 _______ is an example of GM crop developed for its nutritional value by using soil bacterium Erwinia. 

IR8 

Taichung Native - I

Vijaya 

Golden rice 

Concept: Biotechnological Applications in Agriculture
Chapter: [2.01] Biotechnology - Process and Application
[1]1.D

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

The energy enters the ecosystem through ______. 

consumers

decomposers

omnivores

producers

Concept: Ecosystem – Structure and Function
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[1]1.E

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

Identify free-living bacterial bio-fertilizer. 

Rhizobium

Azotobacter

Nostoc

Bacillus thuringiensis

Concept: Energy Generation
Chapter: [3.02] Microbes in Human Welfare
[1]1.F

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

_______ is a soil bacterium which causes crown gall tumours in dicotyledonous plants. 

Agrobacterium tumefaciens

Bacillus thuringiensis

Haemophilus influenzae

Escherichia coli

Concept: Plasmids
Chapter: [2.01] Biotechnology - Process and Application
[1]1.G

Select and write the most appropriate answer from the given alternatives for the folowing subquestion: 

Which of the following harmful radiation is absorbed by ozone layer of the stratosphere? 

X-ray 

Visible light

Ultraviolet rays

Gamma rays 

Concept: Ozone - Ozone Depletion in the Stratosphere
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[12]2
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[6]2.A
[1]2.A.i

Answer the following question in ‘One’ sentence only:

Define ‘mutation breeding’.

Concept: Mechanism of Evolution
Chapter: [7.01] Origin and the Evolution of Life
[1]2.A.ii

Answer the following question in ‘One’ sentence only:

Enlist the histones which form an octamer of nucleosome.

Concept: General Structure, Types and Functions of RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[1]2.A.iii

Answer each question in ‘One’ sentence only:

Name ‘any one’ therapeutic product of blood proteins made by using r-DNA technology.

Concept: Biotechnological Applications in Agriculture
Chapter: [2.01] Biotechnology - Process and Application
[1]2.A.iv

Answer each question in ‘One’ sentence only:

Name the strain of yeast used in industrial production of wine.

Concept: Asexual Reproduction
Chapter: [5.01] Reproduction in Plants
[1]2.A.v

Answer each question in ‘One’ sentence only: 

Identify which one of the following is a test cross. 

 Tt × Tt

TT × tt

Tt × tt 

Concept: Darwin'S Contribution
Chapter: [7.01] Origin and the Evolution of Life
[1]2.A.vi

Answer each question in ‘One’ sentence only:

Define stock and scion.

Concept: Plant Breeding
Chapter: [3.01] Enhancement in Food Production
[2]2.B

Sketch and label ‘structure of a pea flower’.

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [5.01] Reproduction in Plants
[4]2.C | Attempt Any Two
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[2]2.C.i

Attempt any TWO of the following: 

‘The gene for sickle cell anaemia in homozygous condition is lethal and produces sickle cell trait in heterozygous carrier’. Explain. 

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [7.02] Chromosomal Basis of Inheritance
[2]2.C.ii

Attempt any TWO of the following:

Enlist the applications of tissue culture.

Concept: Tissue Culture
Chapter: [3.01] Enhancement in Food Production
[2]2.C.iii

Attempt any TWO of the following: 

Describe ‘any two’ factors affecting the rate of photosynthesis. 

Concept: Factors Affecting Photosynthesis
Chapter: [4.01] Photosynthesis
[2]2.C.iv

Attempt any TWO of the following:

Define the terms ‘codon’ and ‘anticodon’. 

Concept: General Structure, Types and Functions of RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[9]3 | Attempt any two
[6]3.A
[3]3.A.i

Attempt any TWO of the following: 

Explain in brief biogas production process with the help of a labelled figure. 

Concept: Microbes in Production of Biogas
Chapter: [3.02] Microbes in Human Welfare
[3]3.A.ii

Attempt any TWO of the following: 

Define ‘deforestation’. Comment on its effects

Concept: Deforestation
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[3]3.A.iii

Attempt any TWO of the following: 

With the help of a suitable example illustrate ‘Palindrome’. 

Concept: The DNA - Packaging of Dna Helix
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
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