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Biology Shaalaa.com Model Set 3 2020-2021 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology [Shaalaa.com Model Set 3]
Marks: 70 Academic Year: 2020-2021
Date: April 2021
Duration: 3h
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  1. The question paper is divided into four sections.
  2. Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each.
  3. Section A: Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
  4. Section B: Q. No. 3 to Q. No. 14 contains Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
  5. Section C: Q. No.15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
  6. Section D: Q.No. 27 to Q. No. 31 contains Five long answer type of questions carrying Four marks each. (Attempt any Three).
  7. Figures to the right indicate full marks.
  8. For each MCQ, the 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
[10] 1 | Select and write the correct answer:
[1] 1.i

The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.

1 meiosis and 2 mitosis

1 mitosis and 3 meiosis

1 meiosis and 1 mitosis

1 meiosis and 3 mitosis.

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

______ is an example of helobial endosperm.

Adoxa

coconut

Asphodelus

sunflower

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

The average period of pregnancy in human lasts for ______ days of pregnancy.

280

270

266

290

Concept: Reproduction in Animal and Human
Chapter: [0.02] Reproduction in Lower and Higher Animals
[1] 1.iv

The proportion of an allele in the gene pool to the total number of alleles at a given locus is called _______.

gene pool

gene frequency

gene flow

genetic drift

Concept: Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
[1] 1.v

Any random fluctuation in allele frequency, occurring in the natural population by pure chance is called __________.

gene pool

gene mutation

genetic recombination

genetic drift

Concept: Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
[1] 1.vi

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.vii

In the zone of absorption, epidermal cells form unicellular hair-like extensions called ________.

Epiblema cells

Roots

Root hairs

Velamen tissues

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

Which of the following has thickest wall?

Right auricle

Right ventricle

Left auricle

 Left ventricle

Concept: Human Heart
Chapter: [0.08] Respiration and Circulation
[1] 1.ix

In transgenic crop substance provitamin A is obtained in ______.

rice

tomato

canola

canola

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[1] 1.x

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
[8] 2 | Answer the following:
[1] 2.i

Which is the most common type of endosperm in angiospermic families?

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

Identify the permanent birth control method in given diagram.

Concept: Birth Control
Chapter: [0.02] Reproduction in Lower and Higher Animals
[1] 2.iii

Identify the IUD in the given diagram.

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

Whose fossils were discovered at the site of Shivalik hills, India?

Concept: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
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[1] 2.v

What is meant by Hygroscopic water?

Concept: Water Available to Roots for Absorption
Chapter: [0.06] Plant Water Relation
[1] 2.vi

Why is ABA known as antitranspirant?

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

Which Recombinant proteins is obtained for Hepatitis-B by r-DNA technology.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[1] 2.viii

What is ‘Climax community’?

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
Section B
[2] 3 | Attempt any Eight:

Explain heterostyly and herkogamy with suitable example.

Concept: Reproduction in Plant
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2] 4

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

Concept: Asexual Reproduction in Animal
Chapter: [0.02] Reproduction in Lower and Higher Animals
[2] 5

Draw a neat and labelled diagram of Root hair.

Concept: Water and Mineral Absorption by Root
Chapter: [0.06] Plant Water Relation
[2] 6

Why water is called as ‘Elixir of Life’?

Concept: Plant Water Relation
Chapter: [0.06] Plant Water Relation
[2] 7

A gardener wants to give bushy appearance to plants in our college campus.

  1. What should he do to achieve the same? 
  2. Which property of phytohormones he must be aware of?
Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[2] 8

Define intracellular transport and extracellular transport.

Concept: Transportation in Living Organisms
Chapter: [0.08] Respiration and Circulation
[2] 9

Define Bohr effect and Haldane effect.

Concept: Breathing – Respiratory Cycle
Chapter: [0.08] Respiration and Circulation
[2] 10

Define Hamburger’s phenomenon. Add a note on it.

Concept: Breathing – Respiratory Cycle
Chapter: [0.08] Respiration and Circulation
[2] 11

Sketch and label T.S of Spinal cord.

Concept: Human Nervous System
Chapter: [0.09] Control and Co-ordination
[2] 12

Which two hormones are responsible for the regulation of calcium and phosphorus in the blood?

Concept: Human Endocrine Glands - Thyroid Gland
Chapter: [0.09] Control and Co-ordination
[2] 13

Give names of two organisations which provide most commonly used models of biogas plants.

Concept: Microbes in Energy Generation
Chapter: [0.11] Enhancement of Food Production
[2] 14

Write any two human disorders and to cure which recombinant proteins are produced?

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
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Section C
[3] 15 | Attempt any Eight:

Explain any two contrivances or outbreeding devices for pollination.

Concept: Outbreeding Devices (Contrivances)
Chapter: [0.01] Reproduction in Lower and Higher Plants
[3] 16

Explain any three methods that can be used to overcome infertility.

Concept: Infertility
Chapter: [0.02] Reproduction in Lower and Higher Animals
[3] 17

Write a note on bleeder’s disease and its inheritance with a suitable chart.

Concept: Deviations from Mendel’s Findings
Chapter: [0.03] Inheritance and Variation
[3] 18

Give reasons for the development of Turner’s syndrome and also mention its symptoms.

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[3] 19

Short Answer Question:

Write a note on Human genome project (HGP).

Concept: Human Genome Project
Chapter: [0.04] Molecular Basis of Inheritance
[3] 20

Draw a neat and labelled diagram explaining Meselson’s and Stahl’s experiment.

Concept: The Genetic Material is a DNA
Chapter: [0.04] Molecular Basis of Inheritance
[3] 21

Explain Geographical Isolation

Concept: Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
[3] 22

Define hypertension. Explain coronary artery disease and angina pectoris.

Concept: Blood Pressure (B.P.)
Chapter: [0.08] Respiration and Circulation
[3] 23

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] 24

What is GM plant? Write its different advantages.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[3] 25

Explain the following sequence of succession after a forest fire.

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
[3] 26

The reasons for conservation of biodiversity can be classified into three categories. Name them and describe each in brief.

Concept: Conservation of Wildlife
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
Section D
[4] 27 | Attempt any Three:

Name the phytohormone related with the given phenomenon

  1. Apical dominance
  2. Bolting of Cabbage 
  3. Artificial ripening of fruit
  4. Acts as Anti-transpirant by closing stomata
Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[4] 28

Describe any four hormones secreted by Adenohypophysis. 

Concept: Human Endocrine Glands - Pituitary Gland or Hypophysis Gland
Chapter: [0.09] Control and Co-ordination
[4] 29

Enlist the four types of T- lymphocytes, responsible for immune response of our body.

Concept: Immunity
Chapter: [0.1] Human Health and Diseases

Sketch and label – Structure of Antibody

Concept: Structure of Antibody
Chapter: [0.1] Human Health and Diseases
[4] 30

Explain the process of sewage water treatment before it can be discharged into natural water bodies.

Concept: Microbes in Sewage Treatment
Chapter: [0.11] Enhancement of Food Production
[4] 31

Define population growth. Explain different types of age pyramids.

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