HSC Science (General)
Academic Year: 2020-2021
Date: April 2021
Duration: 3h
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- The question paper is divided into four sections.
- Section A: Q. No. 1 contains Ten multiple-choice type of questions carrying One mark each.
- Section A: Q. No. 2 contains Eight very short answer type of questions carrying One mark each.
- Section B: Q. No. 3 to Q. No. 14 contains Twelve short answer type of questions carrying Two marks each. (Attempt any Eight).
- Section C: Q. No.15 to Q. No. 26 contains Twelve short answer type of questions carrying Three marks each. (Attempt any Eight).
- Section D: Q.No. 27 to Q. No. 31 contains Five long answer type of questions carrying Four marks each. (Attempt any Three).
- Figures to the right indicate full marks.
- 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.
The outer layer of the pollen grain is thick and made up of a complex, non-biodegradable substance called _______.
lignin
cellulose
pectin
sporopollenin
Chapter: [0.01] Reproduction in Lower and Higher Plants
Fill in the blank:
The primary sex organ in human male is _______.
prostate gland
seminal vesicle
penis
testis
Chapter: [0.02] Reproduction in Lower and Higher Animals
Find the odd one out:
H2A
H3
H2B
H1
Chapter: [0.04] Molecular Basis of Inheritance
Semiconservative mechanism of DNA was detected using:
35S
14C
32P
15N
Chapter: [0.04] Molecular Basis of Inheritance
Most plant cells and tissues constitutes _____ % water.
90-95 %
70-80 %
10-25 %
0-20 %
Chapter: [0.06] Plant Water Relation
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
Chapter: [0.07] Plant Growth and Mineral Nutrition
______ shows gastric contractions and inhibit the secretion of gastric juice.
Gastrin
Secretin
Entero- gastrone
Inhibin
Chapter:
Saccharomyces cerevisiae is used to produce enzyme ______.
Invertase
Pectinase
Lipase
Cellulase
Chapter: [0.11] Enhancement of Food Production
The ecological niche of population is a __________.
geographical area where it lives.
set of conditions and resources that it uses
habitat of organisms
place of origin of organisms
Chapter: [0.13] Organisms and Populations
Lichens taking roots on bare rocks are an example of ______.
climax community
pioneer species
climax species
secondary succession
Chapter: [0.14] Ecosystems and Energy Flow
Why anther is called as tetrasporangiate structure?
Chapter: [0.01] Reproduction in Lower and Higher Plants
Why fertilization process in angiosperms is called as double fertilization?
Chapter: [0.01] Reproduction in Lower and Higher Plants
Name the hydrolytic enzyme secreted by the acrosome.
Chapter: [0.02] Reproduction in Lower and Higher Animals
What is the role of Mg++ in Translation?
Chapter: [0.04] Molecular Basis of Inheritance
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What type of isotopes used in semiconservative replication experiment?
Chapter: [0.04] Molecular Basis of Inheritance
Very short answer question.
Name the ancestor of human which is described as a man with an ape brain.
Chapter: [0.05] Origin and Evolution of Life
Why water acts as a thermal buffer?
Chapter: [0.06] Plant Water Relation
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.
Chapter: [0.07] Plant Growth and Mineral Nutrition
Draw a well labelled diagram of T.S. anther.
Chapter: [0.01] Reproduction in Lower and Higher Plants [0.02] Reproduction in Lower and Higher Animals
Answer the following question.
What are the goals of RCH programme.
Chapter: [0.02] Reproduction in Lower and Higher Animals
Explain codominance in colour coat in cattle with checker board method.
Chapter: [0.03] Inheritance and Variation
How t-RNA act as an adapter molecule?
Explain in detail with the help of a diagram.
Chapter: [0.04] Molecular Basis of Inheritance
Distinguish New world and old world monkeys based on their tail along with their examples.
Chapter: [0.05] Origin and Evolution of Life
In which forms water is available to roots for absorption?
Chapter: [0.06] Plant Water Relation
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 |
Chapter: [0.07] Plant Growth and Mineral Nutrition
A young girl is health conscious. Her dietician advised her to include mushrooms in her diet. What must be the reason?
Chapter: [0.11] Enhancement of Food Production
Write a note on uses of somatic cell gene therapy.
Chapter: [0.12] Biotechnology
Write full form of
- IUCN
- NBA
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
Give any four factors that favour high speciation at lower altitudes.
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
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Explain water pollination in detail with its types.
Chapter: [0.01] Reproduction in Lower and Higher Plants
Write down the three main concepts of the modern synthetic theory.
Chapter: [0.05] Origin and Evolution of Life
Draw a neat and labelled diagram of the Root tip showing the root hair zone.
Chapter: [0.06] Plant Water Relation
Write the name of______
- First hormone discovered in plants.
- Biological name of fungus from which Gibberellins were first isolated.
- The name given to the first cytokinin by Skoog and Miller.
Chapter: [0.07] Plant Growth and Mineral Nutrition
Draw diagrammatic representation of cardiac cycle. Explain ventricular systole.
Chapter: [0.08] Respiration and Circulation
Write a note on Hering-Breuer reflex.
Chapter: [0.08] Respiration and Circulation
Answer the questions after observing the diagram given below.
- What acts as the first messenger?
- Why can’t hormones like catecholamines enter their target cells through plasma membrane?
- Name the mode of hormone action shown in the diagram.
Chapter: [0.09] Control and Co-ordination
Describe any three functions of hypothalamus.
Chapter: [0.09] Control and Co-ordination
Mention any four benefits of biogas.
Chapter: [0.11] Enhancement of Food Production
Define biotechnology? Which are the basic principles and process of biotechnology?
Chapter: [0.12] Biotechnology
Explain any three important characteristics of population.
Chapter: [0.13] Organisms and Populations
Explain the progress of ecological succession in newly formed volcanic island.
Chapter: [0.14] Ecosystems and Energy Flow
Answer the following question.
Describe the various methods of birth control to avoid pregnancy.
Chapter: [0.02] Reproduction in Lower and Higher Animals
Explain the structure of chromosomes with labelled diagram.
Chapter: [0.03] Inheritance and Variation
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.
Chapter: [0.08] Respiration and Circulation
Write a note on the four different kinds of cell in Pancreas.
Chapter: [0.09] Control and Co-ordination
Explain the mode of transmission of HIV.
Chapter: [0.02] Reproduction in Lower and Higher Animals
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