HSC Science (General) 12th Board ExamMaharashtra State Board
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Question Paper Solutions - Biology 2015 - 2016 HSC Science (General) 12th Board Exam

SubjectBiology
Year2015 - 2016 (July)

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

Genotype of human blood group ‘O’ will be __________.
(A) IAIA

(B)IAIB

(C) ii

(D) IAi

Chapter: [1.01] Genetic Basis of Inheritance
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[1]1.2

‘Cry’ genes are present in __________.

(A) Agrobacterium tumefaciens

(B) Bacillus thuringiensis

(C) Rhizobium species

(D) Escherichia coli

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
[1]1.3

‘Tropane’ is obtained from __________.

(A) Daucus carota

(B) Catharanthus roseus

(C) Datura stramoneum

(D) Mentha piperata

Chapter: [2.01] Biotechnology - Process and Application
Concept: Transposons
[1]1.4

Which of the following vitamins is not fat soluble?

(A) Vitamin A

(B) Vitamin B

(C) Vitamin D

(D) Vitamin K

Chapter: [3.02] Microbes in Human Welfare
Concept: Introduction of Microbes in Human Welfare
[1]1.5

How many meiotic divisions are required to produce 200 seeds?

(A) 50 

(B) 100

(C) 200

(D) 250

Chapter: [5.01] Reproduction in Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[1]1.6

Energy flow in ecosystem is_____

(A) reverse

(B) unidirectional

(C) bidirectional

(D) multidirectional

Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Energy Flow
[1]1.7

Endosperm of angiosperm is __________.

(A) haploid

(B) diploid

(C) triploid

(D) tetraploid

Chapter: [5.01] Reproduction in Plants
Concept: Post-fertilisation : Structures and Events - Endosperm
[12]2
[6]2.1 | Answer in ‘One’ sentence only :
[1]2.1.1

What is Bacteriophage?

Chapter: [2.01] Biotechnology - Process and Application
Concept: Bacteriophages
[1]2.1.2

What is emasculation?

Chapter: [3.01] Enhancement in Food Production
Concept: Plant Breeding
[1]2.1.3

What is VAM?

Chapter: [3.02] Microbes in Human Welfare
Concept: Microbes as Biocontrol Agents
[1]2.1.4

What is the role of decomposers in an ecosystem?

Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Ecosystem – Structure and Function
[1]2.1.5

Name any two edible mushrooms.

Chapter: [3.02] Microbes in Human Welfare
Concept: Microbes in Household Products
[1]2.1.6

What is ecological succession?

Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Ecological Succession
[2]2.2

Sketch and label the ‘Ultrastructure of Mitochondrion’.

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Structure of DNA and RNA
[4]2.3 |  Answer the following (Any TWO):
[2]2.3.1
[2]2.3.2

Name any two antibiotics with their microbial source.

Chapter: [3.02] Microbes in Human Welfare
Concept: Microbes in Industrial Production
[2]2.3.3

Describe the formation of helobial endosperm

Chapter: [5.01] Reproduction in Plants
Concept: Post-fertilisation : Structures and Events - Endosperm
[2]2.3.4

Give the hazardous effects of agrochemicals

Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
Concept: Agrochemicals and Their Effects
[9]3
[6]3.1 | Answer the following (Any TWO):
[2]3.1.1

Explain incomplete dominance with suitable example

Chapter: [1.01] Genetic Basis of Inheritance
Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
[2]3.1.2

What are transgenic plants? Explain with any two examples

Chapter: [3.01] Enhancement in Food Production
Concept: Plant Breeding
[2]3.1.3

Explain micropropagation and somatic hybridization.

Chapter: [3.01] Enhancement in Food Production
Concept: Tissue Culture
[3]3.2

Name the parts of an angiosperm flower in which development of male and female gametophyte take place

Chapter: [5.01] Reproduction in Plants
Concept: Flower – a Fascinating Organ of Angiosperms
[7]4 | Attempt any one
[7]4.1

Give the central dogma of protein synthesis.

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Transcription - Introduction of Transcription

Explain the process of translation

Chapter: [1.02] Gene - Its Nature, Expression and Regulation
Concept: Transcription - Introduction of Transcription
[7]4.2

What is dark reaction in photosynthesis?

Chapter: [4.01] Photosynthesis
Concept: Light-independent Reactions

Describe C3 Pathway.

Chapter: [4.01] Photosynthesis
Concept: Light-independent Reactions
[7]5 | Select and write the most appropriate answer from the given alternatives for each subquestion:
[1]5.1

Vermiform appendix is an example of __________ organ.

(A) vestigeal

(B) homologous

(C) sense

(D) analogous

Chapter: [7.01] Origin and the Evolution of Life
Concept: Introduction of Evolution and Origin of Universe and Earth
[1]5.2

In which of the following disorders number of chromosomes present is 47?
(A) Turner’s syndrome
(B) Cushing’s syndrome
(C) Acquired Immuno - Deficiency Syndrome
(D) Down’s syndrome

Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Genetic Disorders - Chromosomal Disorders
[1]5.3

Human blood clotting factor VIII is used to treat __________.

(A) pituitary dwarfism

(B) diabetes mellitus

(C) haemophilliacs

(D) cystic fibrosis

Chapter: [10.01] Circulation
Concept: Blood - Coagulation of Blood
[1]5.4

A person suffering from diabetes insipidus shows __________.

(A) hyperglycemia

(B) hypoglycemia

(C) polyuria

(D) hypertension

Chapter: [10.03] Control and Co-ordination
Concept: Hypo and Hyperactivity and Related Disorders - Dwarfism, Acromegaly, Cretinism, Goiter, Exophthalmic Goiter, Diabetes, Addison'S Disease
[1]5.5

Photoreceptor cells are present in __________.

(A) blind spot

(B) retina

(C) cochlea

(D) cornea

 

Chapter: [10.03] Control and Co-ordination
Concept: Sensory Reception and Processing - Concept of the Ear
[1]5.6

‘HAART’ is suggested for the treatment of __________

(A) malaria

(B) cancer

(C) AIDS

(D) high chloesterol level

Chapter: [9.01] Human Health and Diseases
Concept: AIDS
[1]5.7

For DNA fingerprinting radioactive probe obtained from __________ is used in India.

(A) Banded Krait

(B) King Cobra

(C) Viper

(D) Rat snake

Chapter: [8.01] Genetic Engineering and Genomics
Concept: DNA Fingerprinting
[12]6
[6]6.1 | Answer in ‘One’ sentence each:
[1]6.1.1

Define the following term and give one example for each:

Commensalism

Chapter: [12.01] Organisms and Environment 2
Concept: Population - Population Interactions
[1]6.1.2

What is the common name of Apis mellifera?

Chapter: [9.01] Human Health and Diseases
Concept: Common Diseases in Humans
[1]6.1.3

Which growth hormone is used to enhance dairy productivity?

Chapter: [9.02] Animal Husbandry
Concept: Animal Husbandry
[1]6.1.4

Define Linkage.

Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Inheritance of Two Genes - Linkage and Crossing Over
[1]6.1.5

Name of two classes to which Archaeopteryx acts as connecting link.

Chapter: [9.02] Animal Husbandry
Concept: Animal Husbandry
[1]6.1.6

Define the term natality.

Chapter: [12.01] Organisms and Environment 2
Concept: Population - Population Attributes
[2]6.2

Sketch and label the structure of Malpighian body.

Chapter: [10.02] Excretion and Osmoregulation
Concept: Regulation of Kidney Function
[4]6.3 | Attempt any TWO of the following
[2]6.3.1

Enlist any four sequential evolutionary names of human ancestors.

Chapter: [7.01] Origin and the Evolution of Life
Concept: Evidences for Evolution
[2]6.3.2

Give the importance of transgenic animals.

Chapter: [8.01] Genetic Engineering and Genomics
Concept: Transgenic Animals
[2]6.3.3

Give the economic importance of lac.

Chapter: [9.02] Animal Husbandry
Concept: Animal Husbandry
[2]6.3.4

Give the fate of mesoderm.

Chapter: [11.01] Human Reproduction
Concept: Pregnancy and Embryonic Development
[9]7
[6]7.1 | Attempt any TWO of the following:
[3]7.1.1

Explain mechanism of sex-determination in birds.

Chapter: [7.02] Chromosomal Basis of Inheritance
Concept: Sex Determination in Birds
[3]7.1.2

Give any two unique features of acquired immunity.

Chapter: [9.01] Human Health and Diseases
Concept: Concept of Immunity
[3]7.1.3

Construct an age pyramid which reflects an expanding growth status of human population.

Chapter: [12.01] Organisms and Environment 2
Concept: Population - Population Attributes
[3]7.2

With the help of a neat and labelled diagram, describe reflex arc.

Chapter: [10.03] Control and Co-ordination
Concept: Reflex Action and Reflex Arc
[7]8 | Attempt any one of the following
[7]8.1

Explain the process of early cleavage till the formation of morula.

Chapter: [11.01] Human Reproduction
Concept: Embryo Development Upto Blastocyst Formation
[7]8.2

Describe five types of leucocytes, with the help of diagrams. Add a note on their functions.

Chapter: [10.01] Circulation
Concept: Blood - Coagulation of Blood
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