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Biology Model set 3 shaalaa.com 2021-2022 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology [Model set 3 shaalaa.com]
Marks: 70 Academic Year: 2021-2022
Date: March 2022
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General instructions:

  • The question paper is divided into four sections:
  1. Section A: Question No. 1 contains 10 multiple choice type questions carrying one mark each. Question No. 2 contains 8 very short answer type questions carrying one mark each.
  2. Section B: Question No. 3 to Question No. 14 are 12 short answer-I type questions carrying two marks each. Attempt any eight questions.
  3. Section C: Question No. 15 to Question No. 26 are 12 short answer-II type questions carrying three marks each. Attempt any eight questions. 
  4. Section D: Question No. 27 to Question No. 31 are 5 long answer type questions carrying four marks each. Attempt any three questions.
  • Start each section on a new page.
  • Figures to the right indicate full marks.
  • For each MCQ, correct answer must be written along with its alphabet.
    e.g., (a) ..... / (b ) .... / ( c ) .... / ( d) ..... Only first attempt will be considered for evaluation.

SECTION-A
[18] 1 | Select and write the correct answer:
[1] 1.i

The single shield-shaped cotyledon in monocot seed is known as ______.

coleoptile

scutellum

aleurone layer

perisperm

Concept: Reproduction in Plant
Chapter: [0.01] Reproduction in Lower and Higher Plants
[1] 1.ii

Which one of the following is the most accurate definition of the term ‘health’?

Health is the state of body and mind in a balanced condition

Health is the reflection of a smiling face.

Health is a state of complete physical, mental and social well-being.

Health is the symbol of economic prosperity.

Concept: Immunity
Chapter: [0.1] Human Health and Diseases
[1] 1.iii

Meanrch, menstrual cycle, and menopause are controlled by ______.

thyrotropic hormone

gonadotropic hormone

somatotropic hormone

corticotropin

Concept: Menstrual Cycle (Ovarian Cycle)
Chapter: [0.02] Reproduction in Lower and Higher Animals
[1] 1.iv

Root hair is ________ extension of epiblema cells.

Cytoplasmic

Protoplasmic

Nucleoplasmic

Cellulosic

Concept: Water and Mineral Absorption by Root
Chapter: [0.06] Plant Water Relation
[1] 1.v

The cattle egret and grazing cattle in close association is a classic example of ______.

Mutualism

Parasitism

Commensalism

Competition

Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[1] 1.vi

______ has an important role in the development of immune system by maturation of T lymphocytes.

Thyroxine

Thymosin

Aldosterone

Parathormone

Concept: Human Endocrine Glands - Thymus Gland
Chapter: [0.09] Control and Co-ordination
[1] 1.vii

Select the odd example with respect to types of conservation strategies. 

Pawra tribals in Satpuda have protected varieties of corn with different coloured kernels.

Kanha forest as tiger reserve.

Crocodile bank of Chennai

Sacred groves

Concept: Conservation of Wildlife
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[1] 1.viii

Lichens taking roots on bare rocks are an example of ______.

climax community

pioneer species

climax species

secondary succession

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
[1] 1.ix

First natural cytokinin was obtained from ______.

Rice plants

Tobacco callus

Maize grains

Human urine

Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[1] 1.x

The volume of air that remains in the lungs after maximum respiration is ______.

1000 to 1100 ml

1100 to 1200 ml

2000 to 3000 ml

5200 to 5800 ml

Concept: Breathing – Respiratory Cycle
Chapter: [0.08] Respiration and Circulation
[8] 2 | Answer the following questions:
[1] 2.i

Why is ABA known as antitranspirant?

Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[1] 2.ii

What is ‘Leukemia’?

Concept: Cancer
Chapter: [0.1] Human Health and Diseases
[1] 2.iii

What is ‘Sere’?

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
[1] 2.iv

How electrical synapse differs from chemical synapse?

Concept: Neuron (Or Nerve Cell) and Its Types - Synapse
Chapter: [0.09] Control and Co-ordination
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[1] 2.v

What is ESS?

Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[1] 2.vi

What is the role of Taq-polymerase in PCR technology?

Concept: Process and Principles of Biotechnology
Chapter: [0.12] Biotechnology [0.12] Biotechnology
[1] 2.vii

Identify the IUD in the given diagram.

Concept: Infertility
Chapter: [0.02] Reproduction in Lower and Higher Animals
[1] 2.viii

A medicinal plant Rauwolfia vomitoria shows variations in concentration of reserpine from location to location. What type of level of biodiversity is this?

Concept: Levels of Biodiversity
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
SECTION-B
[2] 3 | Attempt any EIGHT of the following questions:

Differentiate between complete and incomplete linkage.

Concept: Linkage and Crossing Over
Chapter: [0.03] Inheritance and Variation
[2] 4

Enlist any four therapies used to treat a cancer patient.

Concept: Cancer
Chapter: [0.1] Human Health and Diseases
[2] 5

Draw a well labelled diagram of male gametophyte of angiosperms.

Concept: Structure of Microspore Or Pollen Grain
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2] 6

What is Mortality? What are its two types?

Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[2] 7

With the help of any one example explain Alien species invasion as one of the causes of Biodiversity losses.

Concept: Loss of Biodiversity
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[2] 8

Which hormone is secreted by Pineal gland? What is its function?

Concept: Human Endocrine Glands - The Pineal Gland
Chapter: [0.09] Control and Co-ordination
[2] 9

Match the column A with B

  A B
i. Epinasty of flower GA3
ii. Natural auxin NAA
iii. Flowering in Litchi IAA
iv. Bolting of Beet Ethylene
Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[2] 10

What is lactation? Which hormone is responsible for its regular secretion?

Concept: Asexual Reproduction - Asexual Reproduction in Animal
Chapter: [0.02] Reproduction in Lower and Higher Animals
[2] 11

Give reasons – ‘Primary succession is always slower than secondary succession’

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
[2] 12

Define Bohr effect and Haldane effect.

Concept: Breathing – Respiratory Cycle
Chapter: [0.08] Respiration and Circulation
[2] 13

How t-RNA act as an adapter molecule?
Explain in detail with the help of a diagram.

Concept: Protein Synthesis
Chapter: [0.04] Molecular Basis of Inheritance
[2] 14

Give an account of polyembryony.

Concept: Polyembryony
Chapter: [0.01] Reproduction in Lower and Higher Plants
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SECTION-C
[3] 15 | Attempt any EIGHT of the following questions:

Define Biotechnology? How it is used in production of Human insulin.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[3] 16

Draw the chart of double circulation and label A, B, C and D.

Concept: Circulation
Chapter: [0.08] Respiration and Circulation
[3] 17

Name any three types of premating isolating mechanisms.

Concept: Mechanism of Organic Evolution
Chapter: [0.05] Origin and Evolution of Life
[3] 18

What is GM plant? Write its different advantages.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[3] 19

Write the name of ______

  1. Gaseous growth hormone known to you.
  2. Standard bio assay method for auxins. 
  3. Hormone that can overcome the requirement of vernalization.
Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[3] 20

Name three Mixed cranial nerves along with their numbers.

Concept: Neuron (Or Nerve Cell) and Its Types - Synapse
Chapter: [0.09] Control and Co-ordination
[3] 21

Match the column A with B and rewrite correct pairs.

  A   B
1. citric acid a) in medicine for solubility of Ca++
2. fumaric acid b) confectionary
3. gluconic acid c) in resins as wetting agents
Concept: Microbes in Industrial Production
Chapter: [0.11] Enhancement of Food Production
[3] 22

Draw a neat and labelled diagram of the Root tip showing the root hair zone.

Concept: Water and Mineral Absorption by Root
Chapter: [0.06] Plant Water Relation
[3] 23

Describe the development of dicot embryo in flowering plants.

Concept: Post Fertilization in Plant: Development of Embryo (Embryogeny)
Chapter: [0.01] Reproduction in Lower and Higher Plants
[3] 24

State any three benefits of using Biogas.

Concept: Microbes in Energy Generation
Chapter: [0.11] Enhancement of Food Production
[3] 25

How roots can act as a water absorbing organ?

Concept: Means of Transport in Plants
Chapter: [0.06] Plant Water Relation
[3] 26

Write down the three main concepts of the modern synthetic theory.

Concept: Theories of Biological Evolution - Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
SECTION-D
[4] 27 | Attempt any THREE of the following questions:

Draw labelled diagram of internal structure of human heart.

Label right atrium, mitral valve, left ventricle and pulmonary semilunar valve.

Write a function of Eustachian and tricuspid valve found in human heart.

Concept: Human Heart
Chapter: [0.08] Respiration and Circulation
[4] 28

Give an account of one Mendelian and one chromosomal disorder you have studied.

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[4] 29

Complete the flowchart of the process of conduction of nerve impulses.

Application of stimulus on a resting nerve
Permeability of membrane changes
______________________________
Positive ions inside axon increases
________________________________
Polarity reverses and depolarisation takes place
Repolarisation - potassium gates open
______________________________
______________________________
Axoplasm becomes negatively charged and ECF
becomes positive
Concept: Neuron (Or Nerve Cell) and Its Types - Transmission of Nerve Impulse
Chapter: [0.09] Control and Co-ordination
[4] 30

Draw a neat and labelled diagram of transcription and processing of hn-RNA

Concept: Protein Synthesis
Chapter: [0.04] Molecular Basis of Inheritance
[4] 31

Explain the ovarian cycle with its different phases.

Concept: Menstrual Cycle (Ovarian Cycle)
Chapter: [0.02] Reproduction in Lower and Higher Animals

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