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Biology Shaalaa.com Model Set 2 2020-2021 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology [Shaalaa.com Model Set 2]
Marks: 70Academic Year: 2020-2021
Date: April 2021
Duration: 3h
  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

In human beings 45 chromosomes/single X/XO abnormality causes

Down's syndrome

Klinfelter's syndrome

Turner's syndrome

Edward's syndrome

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[1]1.ii

The word chromosome was coined by

Benda

Waldeyer

Robert Hooke

T.H.Morgan

Concept: Genetic Terminology
Chapter: [0.03] Inheritance and Variation
[1]1.iii

Find out the example in which due to absence of respiratory pigment transport of respiratory gases does not takes place.

Cockroach

Scoliodon

Frog

Human

Concept: Circulation in Animals
Chapter: [0.08] Respiration and Circulation
[1]1.iv

The erythropoeitic tissue in adult is mainly found in ______.

kidney

liver

red bone marrow

spleen

Concept: Red Blood Corpuscles/Erythrocytes
Chapter: [0.08] Respiration and Circulation
[1]1.v

______ is a mineralocorticoid secreted by Adrenal gland.

Aldosterone

Cortisol

Corticoid

Androgen

Concept: Adrenal Gland/Suprarenal Gland
Chapter: [0.09] Control and Co-ordination
[1]1.vi

Degeneration of dopamine producing neurons in the CNS causes ______ disease.

ADHD

Alzheimer’s

Parkinson’s

Fever

Concept: Human Nervous System
Chapter: [0.09] Control and Co-ordination
[1]1.vii

Carcinoma is cancer of ______ cells.

Epithelial

Connective tissue

Bone

Blood

Concept: Concept of Cancer
Chapter: [0.1] Human Health and Diseases [9.01] Human Health and Diseases
[1]1.viii

Wheat -Atlas 66 has high contents of ______.

protein

vitamin

carbohydrates

Fats

Concept: Plant Breeding
Chapter: [0.11] Enhancement of Food Production
[1]1.ix

Polar bears show hibernation during ______.

winter

summer

rainy season

favourable conditions

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

Dodo bird, stellar sea cow and passenger pigeon are few examples of extinction due to ______.

habitat loss

hunting

Alien species invasion

overexploitation

Concept: Biodiversity - Loss of Biodiversity
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues [12.01] Organisms and Environment 2
[8]2 | Answer the following:
[1]2.i

How many linkage groups are present in Drosophila melanogaster?

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [0.03] Inheritance and Variation [7.02] Chromosomal Basis of Inheritance
[1]2.ii

What is the reason for the 21st trisomy?

Concept: Genetic Disorders
Chapter: [0.03] Inheritance and Variation
[1]2.iii

Identify ‘A’ from the following ECG.

Concept: Blood Pressure (B. P.)
Chapter: [0.08] Respiration and Circulation
[1]2.iv

Very very short answer question.

What is the function of the red nucleus?

Concept: Human Nervous System
Chapter: [0.09] Control and Co-ordination
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[1]2.v

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

Concept: Principles and Processes of Biotechnology
Chapter: [0.12] Biotechnology
[1]2.vi

What is plasmid?

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

Define ‘Ecological succession’

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

Mention significance of fruit and seed formation.

Concept: Seed and Fruit Development
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2]4

Give an account of polyembryony.

Concept: Polyembryony
Chapter: [0.01] Reproduction in Lower and Higher Plants
[2]5

Identify the parts labelled in the given diagram.

Concept: Parturition
Chapter: [0.02] Reproduction in Lower and Higher Animals
[2]6

Write a note on sex linkage.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [0.03] Inheritance and Variation [7.02] Chromosomal Basis of Inheritance
[2]7

Explain Avery, McCarty, and MacLeod’s experiment in detail.

Concept: The Genetic Material is a DNA
Chapter: [0.04] Molecular Basis of Inheritance
[2]8

Describe modern man.

Concept: Human Evolution
Chapter: [0.05] Origin and Evolution of Life
[2]9

Draw diagram of conducting system of human heart. Label SA node and bundle of His.

Concept: Heart
Chapter: [0.08] Respiration and Circulation
[2]10

How a portal vein differs from normal vein?

Concept: Blood Vessels
Chapter: [0.08] Respiration and Circulation
[2]11

‘Injury to the medulla oblongata causes sudden death’ Explain.

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

Name two bacteria which are responsible for fermenting dough of idli, dosa.

Concept: Introduction of Microbes in Human Welfare
Chapter: [0.11] Enhancement of Food Production
[2]13

For production of edible vaccines plants are used. Explain this any one example.

Concept: Applications of Biotechnology
Chapter: [0.12] Biotechnology
[2]14

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

Concept: Biodiversity - Loss of Biodiversity
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues [12.01] Organisms and Environment 2
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Section C
[3]15 | Attempt any Eight:

Human pregnancy shows three prominent trimesters. Answer the following question based on these trimester.

  1. What is morning sickness during the first trimester?
  2. Name the hormone secreted in the second trimester.
  3. The organ which secretes hormone in second trimester is
Concept: Pregnancy
Chapter: [0.02] Reproduction in Lower and Higher Animals
[3]16

Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions

(a) Acrosome

(b) Nucleus

(c) Middle piece

Concept: Gametogenesis
Chapter: [0.02] Reproduction in Lower and Higher Animals [11.01] Human Reproduction
[3]17

Write a note on the morphological structure of the root.

Concept: Plant Root
Chapter: [0.06] Plant Water Relation
[3]18

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 Growth Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
[3]19

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

Concept: Circulation in Animals
Chapter: [0.08] Respiration and Circulation
[3]20

Give the names of the hormones released by neurohypophysis.

A boy shows excessive thirst and micturition because of deficiency of a hormone secreted by neurohypophysis. Name the disease he is suffering from.

Concept: Pituitary Gland Or Hypophysis Gland
Chapter: [0.09] Control and Co-ordination
[3]21

Distinguish between

Cerebrum and Cerebellum.

Concept: Nervous System - Synapse
Chapter: [0.09] Control and Co-ordination
[3]22

When the ELISA test was conducted on an immune-suppressed person, he tested positive for a pathogen.

  1. Identify the disease the patient is suffering from.
  2. Name the causative entity. 
  3. Mention the cells of the body that are attacked by the pathogen.
Concept: AIDS
Chapter: [0.1] Human Health and Diseases [9.01] Human Health and Diseases
[3]23

Write chemical reactions to represent Methanogenesis.

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

What is Recognition sequence? Explain in brief.

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

Explain the role of any three abiotic factors affecting the environment.

Concept: Organism and Its Environment - Major Abiotic Factors
Chapter: [0.13] Organisms and Populations
[3]26

What are ‘pioneer species’? Give two examples of them.

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

Describe the development of female gametophyte of angiosperms with the help of diagram.

Concept: Asexual Reproduction
Chapter: [0.01] Reproduction in Lower and Higher Plants
[4]28

Short Answer Question:

Write a note on applications of DNA fingerprinting.

Concept: DNA Fingerprinting
Chapter: [0.04] Molecular Basis of Inheritance [8.01] Genetic Engineering and Genomics
[4]29

Long answer question.

By taking industrial melanism as one example. Explain the concept of natural selection.

Concept: Modern Synthetic Theory of Evolution
Chapter: [0.05] Origin and Evolution of Life [7.01] Origin and the Evolution of Life
[4]30

Long answer question.

Describe structure of root hair.

Concept: Plant Root
Chapter: [0.06] Plant Water Relation
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[4]31

Write full form of

  1. IAA 
  2. IBA 
  3. NAA 
  4. 2,4-D
Concept: Plant Growth Hormones
Chapter: [0.07] Plant Growth and Mineral Nutrition
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