HSC Science (General)
Academic Year: 2021-2022
Date: March 2022
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General instructions:
- The question paper is divided into four sections:
- Section A: Question No. 1 contains 10 multiple choice type questions carrying one mark each. Question No. 2 contains 8 very short answer type questions carrying one mark each.
- Section B: Question No. 3 to Question No. 14 are 12 short answer-I type questions carrying two marks each. Attempt any eight questions.
- Section C: Question No. 15 to Question No. 26 are 12 short answer-II type questions carrying three marks each. Attempt any eight questions.
- Section D: Question No. 27 to Question No. 31 are 5 long answer type questions carrying four marks each. Attempt any three questions.
- Start each section on a new page.
- Figures to the right indicate full marks.
- For each MCQ, 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
Find out the example in which due to absence of respiratory pigment transport of respiratory gases does not takes place.
Cockroach
Scoliodon
Frog
Human
Chapter: [0.08] Respiration and Circulation
What happened when heat-killed S-cells along with living R-cells were injected into mice?
Mice died and showed live S-cells
Mice survived and showed live S-cells
Mice died and showed live R-cells
Mice died and showed dead R-cells
Chapter: [0.04] Molecular Basis of Inheritance
RR (Red) Antirrhinum is crossed with white (rr) one. Offspring (Rr) are pink. This is an example of ______.
Dominant -recessive
Incomplete dominance
Hybrid
Supplementary genes
Chapter: [0.03] Inheritance and Variation
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
The resting potential of a neuron is ______.
30 millivolts
-30 millivolts
70 millivolts
-70 millivolts
Chapter: [0.09] Control and Co-ordination
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
Fine soil particles imbibe or absorb water and hold it. This is called as _______.
Hygroscopic Water
Gravitational Water
Combined Water
Capillary Water
Chapter: [0.06] Plant Water Relation
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
Regional and local variations within each biome lead to the formation of variety of ______.
Habitats
niches
species
genus
Chapter: [0.13] Organisms and Populations
What is atresia with respect to ovary in human females?
Chapter: [0.02] Reproduction in Lower and Higher Animals
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
Define ‘Ecological succession’.
Chapter: [0.14] Ecosystems and Energy Flow
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Why water acts as a thermal buffer?
Chapter: [0.06] Plant Water Relation
Enlist the names of enzymes used in semiconservative replication of DNA?
Chapter: [0.04] Molecular Basis of Inheritance
How absolute Natality differs from Realized Natality
Chapter: [0.13] Organisms and Populations
What is adventive polyembryony?
Chapter: [0.01] Reproduction in Lower and Higher Plants
Give any four the symptoms of Ascariasis.
Chapter: [0.1] Human Health and Diseases
Write full form of
- IUCN
- NBA
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
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
Sketch and label – Structure of Antibody
Chapter: [0.1] Human Health and Diseases
Fill in the blanks with the help of chart.
| Organism | Habitat | Respiratory surface/ organ |
| Coelenterates | ||
| Spiders |
Chapter: [0.08] Respiration and Circulation
Give any two points of difference between homozygous and heterozygous.
Chapter: [0.03] Inheritance and Variation
What led to better utilization of hands for holding objects effectively and better motor skills?
Chapter: [0.05] Origin and Evolution of Life
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
Why water is called as ‘Elixir of Life’?
Chapter: [0.06] Plant Water Relation
‘Injury to the medulla oblongata causes sudden death’ Explain.
Chapter: [0.09] Control and Co-ordination
Show the graphical representation of mean annual rainfall with respect to mean annual temperature.
Chapter: [0.13] Organisms and Populations
Give any four factors that favour high speciation at lower altitudes.
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
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Identify the labels from the given diagram.
Chapter: [0.02] Reproduction in Lower and Higher Animals
What are ‘pioneer species’? Give two examples of them.
Chapter: [0.14] Ecosystems and Energy Flow
Write chemical reactions to represent Methanogenesis.
Chapter: [0.11] Enhancement of Food Production
Write a note on Hering-Breuer reflex.
Chapter: [0.08] Respiration and Circulation
Describe the structure of sex chromosomes with the help of labelled diagram.
Chapter: [0.03] Inheritance and Variation
What is chromosomal aberration? Give any two types of aberrations found in the population.
Chapter: [0.05] Origin and Evolution of Life
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
Distinguish between
Cerebrum and Cerebellum.
Chapter: [0.09] Control and Co-ordination
What is gene cloning? Explain different tools used for it.
Chapter: [0.12] Biotechnology
Write a note on the morphological structure of the root.
Chapter: [0.06] Plant Water Relation
Match the column A with B and rewrite correct pairs
| A | B | |
| I | Mycoherbicides | Cactoblastis |
| II | Bacterial herbicides | Alternaria |
| III | Insects as herbicides | Xanthomonas |
Chapter: [0.11] Enhancement of Food Production
Describe the process of fertilization in angiosperms with the help of a diagram.
Chapter: [0.01] Reproduction in Lower and Higher Plants
Describe the process of spermatogenesis with the help of diagram.
Chapter: [0.02] Reproduction in Lower and Higher Animals
Explain the following terms with respect to rDNA technology
- passanger DNA
- Chimeric DNA
- Transformed cell
- restriction site
Chapter: [0.12] Biotechnology
Describe any four hormones secreted by Adenohypophysis.
Chapter: [0.09] Control and Co-ordination
Short Answer Question:
Write a note on applications of DNA fingerprinting.
Chapter: [0.04] Molecular Basis of Inheritance
With the help of labelled diagram explain the exchange of gases between alveolus and capillary.
Chapter: [0.08] Respiration and Circulation
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