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Published on: 26/08/2026
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
Hydrogen bonds between the nitrogeneous bases make the DNA molecule_____________
unstable
stable
unbalanced
disturbed
2.
Franklin and Wilkin were awarded nobel prize for_________
studying DNA replication
Studying about RNA.
X - ray diffraction studies of DNA.
isolating DNA
3.
V shaped chromosomes are called
metacentric
acrocentric
submetacentric
telocentric
4.
_____________ has been one of the first country in the world to launch the nation wide family planning programme in 1952.
India
China
America
Africa
5.
After fertilization, the ___________________ disintegrates.
Ovule
Polar nuclei
Antipodals
Endosperm
6.
Embryosac of the ovule contains __________ cells and _____________nuclei.
3,3
7,8
8,7
3, 2
7.
The centromere is found at the centre of the____________chromosome
Telocentric
Metacentric
Sub-metacentric
Acrocentric
8.
According to Mendel, alleles have the following character
Pair of genes
Responsible for character
Production of gametes
Recessive factors
9.
Male gametes in angiosperms are formed by the division of _____________.
Generative cell
Vegetative cell
Microspore mother cell
Microspore
10.
Syngamy results in the formation of ______________.
Zoospores
Conidia
Zygote
Chlamydospores
11.
______ is not a feature of veins.
Red in colour
Non-elastic walls
Lack internal valves
Blood flow with low pressure
12.
The heart of amphibians possess____ chambers.
3
4
2
5
13.
Who is regarded as the "Father of Modern Physiology'"?
His-Atrio
William Harvey
Karl Landsteiner
Edward C. Kendal
14.
_________________ is called Stress hormone.
Auxin
Gibberellin
Cytokinin
ABA
15.
______________ is essential for Morphogenesis.
Auxin and Gibberellin
Ethylene
Auxin and Cytokinin
Cytokinin and Abscissic acid
16.
Each neuron can transmit ______________ nerve impulses per second.
2000
3000
1000
5000
17.
Neuroglia are also called as _________________
nerve fibres
glial cells
neuron
nerve cell
18.
___________ is an instrument which records the electrical impules, of brain
ECG
EGG
EEG
EGE
19.
______________ is found abundantly in liquid endosperm of coconut.
Auxin
Cytokinin
Gibberellins
Ethylene
20.
Which is the correct sequence of blood flow
ventricle→ atrium→ vein → arteries
atrium→ ventricle → veins → arteries
atrium→ ventricle→ arteries→ vein
ventricles→ vein→ atrium→ arteries
21.
During transpiration there is loss of
carbon dioxide
oxygen
water
none of the above
22.
Which one is referred as "Master Gland"?
Pineal gland
Pituitary gland
Thyroid gland
Adrenal gland
23.
Identify the exocrine gland
Pituitary gland
Adrenal gland
Salivary gland
Thyroid gland
24.
Nerve cells do not possess
neurilemma
sarcolemma
axon
dendrites
25.
Node of Ranvier is found in
muscles
axons
dendrites
cyton
26.
Each kidney is made up of several ________________.
mascula
nephrons
cortex
epididymis
27.
In leeches sperms are stored in
epididymis
vas deferens
testis
ejaculatory duct
28.
Rabbit do not have ______________ teeth.
incisors
canines
premolars
molars
29.
Mitochondria contains ____________ of protein.
70 - 80 %
80 - 90 %
60 -70 %
50 - 60 %
30.
__________ is the outer most layer.
Stomata
Epidermis
Periderm
Skin
31.
The body of leech has
23 segments
33 segmentsS
38 segiments
30 segments
32.
The segments of leech are known as
Metameres (somites)
Proglottids
Strobila
All the above
33.
Who discovered chemical pathway for photo synthesis?
C.N.R. Rao
Kolliker
Sachs
Melvin Calvin
34.
Which is formed during anaerobic respiration
Carbohydrate
Ethyl alcohol
Acetyl CoA
Pyruvate
35.
The endarch condition is the characteristic feature of
root
stem
leaves
flower
1.
(b)
stable
2.
(c)
X - ray diffraction studies of DNA.
3.
(a)
metacentric
4.
(a)
India
5.
(c)
Antipodals
6.
(b)
7,8
7.
(b)
Metacentric
8.
(b)
Responsible for character
9.
(a)
Generative cell
10.
(c)
Zygote
11.
(c)
Lack internal valves
12.
(a)
3
13.
(b)
William Harvey
14.
(d)
ABA
15.
(c)
Auxin and Cytokinin
16.
(c)
1000
17.
(b)
glial cells
18.
(c)
EEG
19.
(b)
Cytokinin
20.
(c)
atrium→ ventricle→ arteries→ vein
21.
(c)
water
22.
(b)
Pituitary gland
23.
(c)
Salivary gland
24.
(b)
sarcolemma
25.
(b)
axons
26.
(b)
nephrons
27.
(a)
epididymis
28.
(b)
canines
29.
(c)
60 -70 %
30.
(b)
Epidermis
31.
(b)
33 segmentsS
32.
(a)
Metameres (somites)
33.
(d)
Melvin Calvin
34.
(b)
Ethyl alcohol
35.
(b)
stem
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