HSC Science (General)
Academic Year: 2025-2026
Date & Time: 25th February 2026, 11:00 am
Duration: 3h
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General Instructions:
The question paper is divided into four sections.
- Section A: Q. No. 1 contains Ten multiple choice type of questions carrying one mark each. Evaluation will be done for the first attempt only.
Q. No. 2 Contains Eight very short answer type of questions carrying one mark each. - Section B: Q. No. 3 to 14 are short answer type of questions carrying two marks each. (Attempt any Eight)
- Section C: Q. No. 15 to 26 are short answer type of questions carrying three marks each. (Attempt any Eight)
- Section D: Q. No. 27 to 31 are long answer type of questions carrying four marks each. (Attempt any Three)
- Begin the answer of each section on a new page.
A cell divides mitotically into two. Daughter cells divide and redivide repeatedly. Such growth is called ______.
arithmetic growth
geometric growth
growth ratio
qualitative growth
Chapter:
The transgenic plant Tomato contains transgene ______ for the production of flavonoids.
Phytoene synthase
Ferritin
Chalone isomerase
Phytase
Chapter:
The cranial capacity of Neanderthal man was ______ C.C.
650
900
1400
1450
Chapter:
Identify the organism which meet their energy and nutrient requirements by degrading the detritus:
Omnivores
Carnivores
Autotrophs
Saprotrophs
Chapter:
Identify the algae among the following:
Spirulina spp.
Aspergillus niger
Candida utilis
Trichoderma viridi
Chapter:
In plants, soluble food is always translocated in the form of ______.
glucose
starch
sucrose
fructose
Chapter:
Identify invasive plant species from the following:
Gloriosa
Michelia
Sansvieria
Parthenium
Chapter:
The mature plasma cell produces antibodies at the rate of ______ molecules per second.
2000
1000
900
300
Chapter:
Which is the largest WBC among the following?
Eosinophil
Monocyte
Basophil
Lymphocyte
Chapter:
The number of deaths when environmental pressures come into play is known as ______.
absolute mortality
absolute natality
realized mortality
realized natality
Chapter:
Name the gene which is inherited directly from father to son.
Chapter:
The producers receive 5000 Joules of light energy, then how much energy will be transferred to the carnivores (secondary consumers)?
Chapter:
Give the name of a key factor in DNA profiling.
Chapter:
Give the features of respiratory surface for gaseous exchange.
Chapter:
Differentiate between complete sex-linkage and incomplete sex linkage with reference to location of the gene and inheritance.
Chapter:
Explain the properties of a nerve fibre with reference to irritability.
Chapter:
Explain the properties of a nerve fibre with reference to conductivity.
Chapter:
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Draw a neat and labelled diagram of the Nucleosome.
Chapter: [4] Molecular Basis of Inheritance
Mention two advantages of the micropropagation technique.
Chapter: [11] Enhancement of Food Production
Name the organisms and their role in the conversion of rock into soil.
Chapter:
State any two harmful effects of noise pollution on human health.
Chapter:
Enlist the main objectives for improved animal breeding programmes using gene transfer technology.
Chapter:
Explain factors affecting water absorption.
Chapter: [6] Plant Water Relation
Calculate the amount of ATP required by a nitrogen fixer for the formation of 1000 molecules of ammonia.
Chapter:
Name the specialised cell of cyanobacteria where nitrogen is fixed.
Chapter:
Match the respiratory surface to the organism in which it is found:
| Organisms | Respiratory surface/organs |
| (1) Limulus | (a) Lungs |
| (2) Protists | (b) Internal gills |
| (3) Tadpoles of frog | (c) Book lungs |
| (4) Fishes | (d) External gills |
| (5) Reptiles | (e) Plasma membrane |
| (6) Spiders | (f) Book gills |
| (g) Cloaca |
Chapter:
Explain criss-cross inheritance with reference to bleeder’s disease by suitable charts.
Chapter:
Distinguish between the following:
Hibernation and Aestivation
Chapter:
Give two behavioural adaptations of desert animals.
Chapter:
Define Parthenocarpy.
Chapter: [1] Reproduction in Lower and Higher Plants
What is transpiration?
Chapter: [6] Plant Water Relation
Explain stomatal opening and closing mechanism with reference to starch sugar interconversion theory.
Chapter:
Enlist the characteristics of genetic code.
Chapter: [4] Molecular Basis of Inheritance
Mention the name of the germ layer from which the adrenal cortex is developed.
Chapter:
Mention the name of the germ layer from which the pancreas is developed.
Chapter:
Explain the role of alpha (α) cells of the islets of Langerhans.
Chapter:
Explain the role of delta (δ) cells of the islets of Langerhans.
Chapter:
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Give the physiological effects of cannabinoids.
Chapter:
Draw Urey and Miller’s experimental setup and label it.
Chapter:
What is a grand period of growth?
Chapter: [7] Plant Growth and Mineral Nutrition
With the help of labelled diagram describe the structure of human sperm.
Chapter:
Write the name of disorders caused due to hypo secretion of adrenal corticoids. Mention any 3 symptoms of this disorder.
Chapter:
Write the name of disorders caused due to hyper secretion of adrenal corticoids. Mention any 3 symptoms of this disorder.
Chapter:
Explain the nuclear type of endosperm with suitable examples.
Chapter:
Explain the helobial type of endosperm with suitable examples.
Chapter:
What is germ line gene therapy? Why is it not encouraged?
Chapter:
Mention any two acquired disorders for which somatic cell gene therapy is used.
Chapter:
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