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Biology Shaalaa.com Model Set 1 2020-2021 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology [Shaalaa.com Model Set 1]
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 outer layer of pollen grain is thick and made up of complex, nonbiodegradable substance called as _______.

lignin

cellulose

pectin

sporopollenin

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

Fill in the blank:

The primary sex organ in human male is _______.

prostate gland

seminal vesicle

penis

testis

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

Find the odd one out:

H2A

H3

H2B

H1

Concept: Packaging of DNA Helix
Chapter: [0.04] Molecular Basis of Inheritance
[1] 1.iv

Semiconservative mechanism of DNA was detected using:

35S

14C

32P

15N

Concept: DNA Replication
Chapter: [0.04] Molecular Basis of Inheritance
[1] 1.v

Most plant cells and tissues constitutes _____ % water.

90-95 %

70-80 %

10-25 %

0-20 %

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

A farmer is fed up of weeds in his Wheat farm. Which of the following chemicals he can use to overcome the problem?

IBA

IAA

NAA

2,4 – D

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

______ shows gastric contractions and inhibit the secretion of gastric juice.

Gastrin

Secretin

Entero- gastrone 

Inhibin

Concept: Human Endocrine Glands
Chapter:
[1] 1.viii

Saccharomyces cerevisiae is used to produce enzyme ______.

Invertase

Pectinase

Lipase

Cellulase

Concept: Microbes in Industrial Production
Chapter: [0.11] Enhancement of Food Production
[1] 1.ix

The ecological niche of population is a______ A geographical area where it lives.

geographical area where it lives.

set of conditions and resources that it uses

habitat of organisms

place of origin of organisms

Concept: Organisms and the Environment Around
Chapter: [0.13] Organisms and Populations
[1] 1.x

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

Why anther is called as tetrasporangiate structure?

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

Why fertilization process in angiosperms is called as double fertilization?

Concept: Double Fertilization in Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
[1] 2.iii

Name the hydrolytic enzyme secreted by the acrosome.

Concept: Sexually Transmitted Diseases (STD)
Chapter: [0.02] Reproduction in Lower and Higher Animals [0.1] Human Health and Diseases
[1] 2.iv

What is the role of Mg++ in Translation?

Concept: Protein Synthesis
Chapter: [0.04] Molecular Basis of Inheritance
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[1] 2.v

What type of isotopes used in semiconservative replication experiment?

Concept: The Genetic Material is a DNA
Chapter: [0.04] Molecular Basis of Inheritance
[1] 2.vi

Very short answer question.

Name the ancestor of human which is described as a man with an ape brain.

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

Why water acts as a thermal buffer?

Concept: Plant Water Relation
Chapter: [0.06] Plant Water Relation
[1] 2.viii

Buyers often complain that a particular fruit merchant uses some chemical to ripen fruits in his shop.

Name the chemical he must be using to do so.

Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
Section B
[2] 3 | Attempt any Eight:

Draw a well labelled diagram of T.S. anther.

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

Answer the following question.

What are the goals of RCH programme.

Concept: Reproductive Health
Chapter: [0.02] Reproduction in Lower and Higher Animals
[2] 5

Explain codominance in colour coat in cattle with checker board method.

Concept: Chromosomal Theory of Inheritance
Chapter: [0.03] Inheritance and Variation
[2] 6

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] 7

Distinguish New world and old world monkeys based on their tail along with their examples.

Concept: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
[2] 8

In which forms water is available to roots for absorption?

Concept: Water Available to Roots for Absorption
Chapter: [0.06] Plant Water Relation
[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

A young girl is health conscious. Her dietician advised her to include mushrooms in her diet. What must be the reason?

Concept: Microbes in Human Welfare
Chapter: [0.11] Enhancement of Food Production
[2] 11

What is Biopiracy? Explain it with respect to Turmeric.

Concept: Bioethics
Chapter: [0.12] Biotechnology
[2] 12

Write a note on uses of somatic cell gene therapy.

Concept: Commercial Applications of Biotechnology
Chapter: [0.12] Biotechnology
[2] 13

Write full form of

  1. IUCN
  2. NBA
Concept: Biological Diversity Act, 2002
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
[2] 14

Give any four factors that favour high speciation at lower altitudes.

Concept: Levels of Biodiversity
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
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Section C
[3] 15 | Attempt any Eight:

Explain water pollination in detail with its types.

Concept: Pre-fertilization in Plant: Pollination
Chapter: [0.01] Reproduction in Lower and Higher Plants
[3] 16

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

Concept: Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life
[3] 17

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] 18

Write the name of______

  1. First hormone discovered in plants.
  2. Biological name of fungus from which Gibberellins were first isolated. 
  3. The name given to the first cytokinin by Skoog and Miller.
Concept: Plant Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[3] 19

Draw diagrammatic representation of cardiac cycle. Explain ventricular systole.

Concept: Circulation of Blood in the Heart: Cardiac Cycle
Chapter: [0.08] Respiration and Circulation
[3] 20

Write a note on Hering-Breuer reflex.

Concept: Regulation of Breathing
Chapter: [0.08] Respiration and Circulation
[3] 21

Answer the questions after observing the diagram given below.

  1. What acts as the first messenger?
  2. Why can’t hormones like catecholamines enter their target cells through plasma membrane?
  3. Name the mode of hormone action shown in the diagram.
Concept: Human Endocrine Glands - Adrenal Gland (Suprarenal Gland)
Chapter: [0.09] Control and Co-ordination
[3] 22

Describe any three functions of hypothalamus.

Concept: Human Endocrine Glands - Pituitary Gland or Hypophysis Gland
Chapter: [0.09] Control and Co-ordination
[3] 23

State any three benefits of using Biogas.

Concept: Microbes in Energy Generation
Chapter: [0.11] Enhancement of Food Production
[3] 24

Define biotechnology? Which are the basic principles and process of biotechnology?

Concept: Process and Principles of Biotechnology
Chapter: [0.12] Biotechnology [0.12] Biotechnology
[3] 25

Explain any three important characteristics of population.

Concept: Population Interactions
Chapter: [0.13] Organisms and Populations
[3] 26

Explain the progress of ecological succession in newly formed volcanic island.

Concept: Ecological Succession
Chapter: [0.14] Ecosystems and Energy Flow
Section D
[4] 27 | Attempt any Three:

Answer the following question.

Describe the various methods of birth control to avoid pregnancy.

Concept: Birth Control
Chapter: [0.02] Reproduction in Lower and Higher Animals
[4] 28

Explain the structure of chromosomes with labelled diagram.

Concept: Chromosomes - The Carriers of Heredity
Chapter: [0.03] Inheritance and Variation
[4] 29

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] 30

Write a note on the four different kinds of cell in Pancreas.

Concept: Human Endocrine Glands - Adrenal Gland (Suprarenal Gland)
Chapter: [0.09] Control and Co-ordination
[4] 31

Explain the mode of transmission of HIV.

Concept: Sexually Transmitted Diseases (STD)
Chapter: [0.02] Reproduction in Lower and Higher Animals [0.1] Human Health and Diseases
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