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 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.
Chapter: [0.01] Reproduction in Lower and Higher Plants [0.02] Reproduction in Lower and Higher Animals
______ is an example of helobial endosperm.
Adoxa
coconut
Asphodelus
sunflower
Chapter: [0.01] Reproduction in Lower and Higher Plants [0.02] Reproduction in Lower and Higher Animals
The average period of pregnancy in human lasts for ______ days of pregnancy.
280
270
266
290
Chapter: [0.01] Reproduction in Lower and Higher Plants [0.02] Reproduction in Lower and Higher Animals
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
Chapter: [0.05] Origin and Evolution of Life
Any random fluctuation in allele frequency, occurring in the natural population by pure chance is called __________.
gene pool
gene mutation
genetic recombination
genetic drift
Chapter: [0.05] Origin and Evolution of Life
Root hair is ________ extension of epiblema cells.
Cytoplasmic
Protoplasmic
Nucleoplasmic
Cellulosic
Chapter: [0.06] Plant Water Relation
In the zone of absorption, epidermal cells form unicellular hair-like extensions called ________.
Epiblema cells
Roots
Root hairs
Velamen tissues
Chapter: [0.06] Plant Water Relation
Which of the following has thickest wall?
Right auricle
Right ventricle
Left auricle
Left ventricle
Chapter: [0.08] Respiration and Circulation
In transgenic crop substance provitamin A is obtained in ______.
Rice
Tomato
Canola
Sugarcane
Chapter: [0.12] Biotechnology
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
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
Which is the most common type of endosperm in angiospermic families?
Chapter: [0.01] Reproduction in Lower and Higher Plants [0.02] Reproduction in Lower and Higher Animals
Identify the permanent birth control method in given diagram.
Chapter: [0.02] Reproduction in Lower and Higher Animals
Identify the IUD in the given diagram.
Chapter: [0.02] Reproduction in Lower and Higher Animals
Whose fossils were discovered at the site of Shivalik hills, India?
Chapter: [0.05] Origin and Evolution of Life
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Define the following:
Hygroscopic water
Chapter: [0.06] Plant Water Relation
Why is ABA known as antitranspirant?
Chapter: [0.07] Plant Growth and Mineral Nutrition
Which Recombinant proteins is obtained for Hepatitis-B by r-DNA technology.
Chapter: [0.12] Biotechnology
What is ‘Climax community’?
Chapter: [0.14] Ecosystems and Energy Flow
Explain heterostyly and herkogamy with suitable example.
Chapter: [0.01] Reproduction in Lower and Higher Plants [0.02] Reproduction in Lower and Higher Animals
What is lactation? Which hormone is responsible for its regular secretion?
Chapter: [0.02] Reproduction in Lower and Higher Animals
Draw a neat and labelled diagram of Root hair.
Chapter: [0.06] Plant Water Relation
Why water is called as ‘Elixir of Life’?
Chapter: [0.06] Plant Water Relation
A gardener wants to give bushy appearance to plants in our college campus.
- What should he do to achieve the same?
- Which property of phytohormones he must be aware of?
Chapter: [0.07] Plant Growth and Mineral Nutrition
Define intracellular transport and extracellular transport.
Chapter: [0.08] Respiration and Circulation
Define Bohr effect and Haldane effect.
Chapter: [0.08] Respiration and Circulation
Define Hamburger’s phenomenon. Add a note on it.
Chapter: [0.08] Respiration and Circulation
Sketch and label T. S. of Spinal cord.
Chapter: [0.09] Control and Co-ordination
Which two hormones are responsible for the regulation of calcium and phosphorus in the blood?
Chapter: [0.09] Control and Co-ordination
Give names of two organisations which provide most commonly used models of biogas plants.
Chapter: [0.11] Enhancement of Food Production
Write any two human disorders and to cure which recombinant proteins are produced?
Chapter: [0.12] Biotechnology
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Explain any two contrivances or outbreeding devices for pollination.
Chapter: [0.01] Reproduction in Lower and Higher Plants
Explain any three methods that can be used to overcome infertility.
Chapter: [0.02] Reproduction in Lower and Higher Animals
Write a note on bleeder’s disease and its inheritance with a suitable chart.
Chapter: [0.03] Inheritance and Variation
Give reasons for the development of Turner’s syndrome and also mention its symptoms.
Chapter: [0.03] Inheritance and Variation
Short Answer Question:
Write a note on Human genome project (HGP).
Chapter: [0.04] Molecular Basis of Inheritance
Draw a neat and labelled diagram explaining Meselson’s and Stahl’s experiment.
Chapter: [0.04] Molecular Basis of Inheritance
Explain Geographical Isolation
Chapter: [0.05] Origin and Evolution of Life
Define hypertension. Explain coronary artery disease and angina pectoris.
Chapter: [0.08] Respiration and Circulation
Name three Mixed cranial nerves along with their numbers.
Chapter: [0.09] Control and Co-ordination
What is GM plant? Write its different advantages.
Chapter: [0.12] Biotechnology
Explain the following sequence of succession after a forest fire.
Chapter: [0.14] Ecosystems and Energy Flow
The reasons for conservation of biodiversity can be classified into three categories. Name them and describe each in brief.
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
Name the phytohormone related with the given phenomenon.
- Apical dominance
- Bolting of Cabbage
- Artificial ripening of fruit
- Acts as Anti-transpirant by closing stomata
Chapter: [0.07] Plant Growth and Mineral Nutrition
Describe any four hormones secreted by Adenohypophysis.
Chapter: [0.09] Control and Co-ordination
Enlist the four types of T- lymphocytes, responsible for immune response of our body.
Chapter: [0.1] Human Health and Diseases
Sketch and label – Structure of Antibody
Chapter: [0.1] Human Health and Diseases
Explain the process of sewage water treatment before it can be discharged into natural water bodies.
Chapter: [0.11] Enhancement of Food Production
Define population growth. Explain different types of age pyramids.
Chapter: [0.13] Organisms and Populations
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