sslc annual examination 2015 -16 ... · sslc annual examination – 2015 -16 science key answer...
TRANSCRIPT
WWW.KALVIKURAL.COM
SSLC ANNUAL EXAMINATION – 2015 -16
SCIENCE KEY ANSWER MARKS : 75 TIME : 2.30 Hrs
SECTION – I(15 X 1 = 15)
Question
Number Answer Mark
Question
Number Answer Mark
1. An altered gene in sperm 1 9. Increase 1
2. Tetanus 1 10. Decomposition reaction 1
3. Hypothalamus 1 11. Stainless steel 1
4. Seed 1 12. Carbon 1
5. 98.4 – 98.6 0F 1 13. Zero 1
6. Chloroplast 1 14. Black 1
7. Potassium iodide 1 15. Electromagnetic induction 1
8. Methane 1
SECTION – II ( 20 X 2 = 40 )
Question
Number Answer
Division
of
Marks
Total
Marks
16. i. Gene 1
2 ii.Allele 1
17.
Variation : Variation may be defined as differences in the characteristics
among the individuals of the same species. (A) Intra specific variation or
among the different genera (B) Intergeneric variation or different species (C)
Inter specific variation.
1
2 Types of Variations
a. Somatic Variation - It pertains to body cells and it is not inherited.
b. Germinal Variation - It pertains to germ cells or gametes and it is
inheritable. It leads to speciation and evolution.
1
18
i. Vaccine Microbes
ii. Natural Gas Fuel
iii.Citric Acid Organic acids
iv.Vitamins Metabolism
½
½
½
½
2
19.
1. Inflammation of upper respiratory passage – nasal epithelium. 1 2
2. Flow of mucous. 1
20. iii) Leptotene -> zygotene -> Pachytene -> Diplotene -> Diakinesis 2 2
21. a. A – GYNOECIUM B – FRUIT
b. Ovary of Gynoecium (A) is modified into Fruit (B)
1
1 2
22. i) Both ‘A’ and ‘R’ are true and ‘R’ explains ‘A’. 2 2
23.
No. Blood proteins seen
in plasma Function
1. Globulin For immunity
2. Fibrinogen For blood clotting
3. Albumin For water balance
2 2
24. ii) Kidneys maintain the chemical composition of blood. 2 2
25.
Autotrophs Chlorophyll Hi Hibiscus
Parasites Haustoria Cuscutta
Saprophytes Mycorrhiza Hi Monotropa
2 2
26.
a) A- Geotropism B - Phototropism
b) As no growth is involved in the movement of Mimosa, this
movement is known as movement independent of growth,
As growth is involved in Geotropism and Phototropism, these two
1
½
½
2
WWW.KALVIKURAL.COM
movement are known as movement dependent on growth,
27.
Respiration: Oxidation ( Degradation ) of organic food material to release
energy in the form of biological substance called ATP (Adenosine
triphosphate) is called respiration. In addition to ATP, two other substances
formed during respiration are Co2 and H2O.
Balanced equation for aerobic respiration is C6H12O6 + 6O2 6CO2 + 6H2O + 2900 KJ Energy (ATP)
(Glucose)
1
1
2
28.
Grass Grasshopper Frog Snake Eagle
T1 T2 T3 T4 T5
2 2
29. a.Petroleum - It is a fossil fuel . Others are bio-fuels
b. Scabies – It is a water washed disease. Others are water borne diseases.
1
1 2
30. 1.What can be substituted for incandescent bulbs to save energy?
2.How much electricity can be saved per year when we use CFL?
1
1 2
31.
1. Bioalcohol
2. Green diesel
3. Biodiesel
4. Vegetable oil
5. Bioethers
6. Biogas (Any four)
½
½
½
½
2
32. a. Carbon dioxide
b.Pressure of the gas is to be increased
1
1 2
33. The phenomenon by which colloidal particles scatter light is called Tyndall
Effect. 1
1 2
34.
1(C) = 1 x 12 = 12
2(O) = 2 x 16 = 32
——
44 Gram molecular mass of CO2 = 44 g
1
1
2
35.
Option B and D are wrong.
Corrected statements are as follows
b. Nitric acid is used as fertilizer in agriculture.
d. The pH of acid is lesser than 7.
1
1
2
36.
pH = – log10 [H+]
pH = – log10 (0.001)
pH = – log10 (10-3)
= – (–3) log10 10
pH = 3
1
1
2
37. In a period, the metallic character of the element decreases,
while their nonmetallic character increases.
1
1 2
38. c. (A) is right, (R) is revelent 2 2
39. In diamond, each carbon atom is bonded to four other carbon atoms in a
tetrahedral fashion leading to a rigid three dimensional structure, accounting for
its hardness and rigidity.
2 2
40. d. (A) is correct and (R) supports (A). 2 2
WWW.KALVIKURAL.COM
41. Positive
Negative
1
1 2
42.
1 Potential difference Volt
2 Current Ampere
3 Electric Charge Coulomb
4 Resistor Ohm
½
½
½
½
2
43. Lead (37%) and Tin (63%)
Low
1
1 2
44.
Solar energy
( It is conventional source of energy others are non-conventional energy
sources)
1
1
2
45.
Power of the lens,
1
P = -----
f
1
P = ------ = - 0.5 dioptre
-2
1
1
2
46.
Fleming’s Left Hand Rule
Stretch the thumb, forefinger and middle finger of your left
hand such that they are mutually perpendicular. If the
forefinger points in the direction of magnetic field and the
middle finger points in the direction of current, then the thumb
will point in the direction of motion or the force acting on the
conductor.
2 2
47. a. Myopia
b. concave
1
1 2
SECTION – III ( 4 X 5 = 20 )
Question
Number Answer
Division
of Marks
Total
Marks
PART I
48.
i..The immunization schedule for the baby, in the first six
months .
ii.The diseases that can be cured as per the schedule. BCG –Tuberculosis Oral polio - Polio DPT - Diptheria, Pertusis & Tetanus (Triple Antigen)
3
2
5
49. The structure of a neuron : 5
WWW.KALVIKURAL.COM
Nerve cells or neurons are the structural and functional units of the
nervous system. The Human Brain is made up of about 86 billion
neurons and many more neuroglial cells (more than 86 billion). A
nerve cell is a microscopic structure consisting of three major parts
namely, cell body, dendrites and axon.
I.Cell body
The cell structure is irregular in shape or polyhedral. It is also
called cyton. Cell body contains cytoplasm with typical cell
organelles and certain granular bodies called Nissle’s granules.
Nissle’s granules are a group of ribosomes for protein synthesis.
II.Dendrites
Dendrites or Dendrons are short fibres which branch repeatedly
and protrude out of the cell body. Dendrites transmit electrical
impulses towards the cyton.
III.Axon
One of the fibres arising from the cell body is very long with a
branched distal end and it is called Axon. The distal branch of the
axon terminates in bulb-like structures called synaptic knob filled
with chemicals called neuro transmitters. The cytoplasm of the
axon is known as axoplasm. The axon which is covered by a
myelin sheath is formed of many layers of Schwann cells. The
outermost layer of Schwann cells is called Neurilemma. The gaps
left by the myelin sheath are called Nodes of Ranvier. Neurilemma
is discontinuous at Nodes of Ranvier. The myelin sheath ensures
rapid transmission of electric impulses.
Diagram
and parts
2 marks
1
1
1
PART II
50.
i) Yes, some fruits develop without the act of fertilization. Such
fruits are called Parthenocarpic fruits. e.g. seedless grapes, guava,
etc.
i) The classification of fruits
2
5
WWW.KALVIKURAL.COM
3
51
Harmful effects of burning coal
1. Generation of waste products which contain mercury, uranium,
thorium, arsenic and other heavy metals, which are harmful to
human health and environment.
2. Sulphur particles present in the coal causes acid rain.
3. Interference with ground water and water table levels.
4. Contamination of land and water bodies.
5. Dust pollution.
6. Release of CO2, a green house gas, causing climate change and
global warming.
7. Coal is the largest contributor to the man-made increase of CO2
in the air.
5
PART III
52.
a. Isotopes ⇒ These are the atoms of same element with
same atomic number (Z) but different mass number (A).
Example (17Cl35 ,17Cl37
Applications of Avogadro’s Law
1. It is used to determine the atomicity of gases.
2. It is helpful in determining the molecular formula of
gaseous compounds.
3. It establishes the relationship between the vapour
density and molecular mass of a gas.
4. It gives the value of molar volume of gases at STP.
Molar Volume of a gas at STP=22.4 lit (or) 22400 cm3.
5. It explains Gay Lussac’s Law effectively. (Any
Three)
1
3
1
5
53.
Evil effects of consuming alcohol
• If ethanol is consumed, it tends to slow down the
metabolism of our body and depresses the central nervous
system.
•It causes mental depression and emotional disorder.
• It affects our health by causing ulcer, high blood
pressure, cancer, brain and liver damage.
• Nearly 40% accidents occur due to drunken driving.
• Unlike ethanol, intake of methanol in very small
quantities can cause death.
• Methanol is oxidized to methanol (formaldehyde) in the
liver and methanol reacts rapidly with the components of
cells.
• Methanal causes the protoplasm to get coagulated, in
the same way an egg coagulates while cooking. Methanol
also affect
3
2
5
PART IV
54.
Achievements of Chandrayaan – I
•The discovery of wide-spread presence of water
molecules in lunar soil.
• Chandrayaan’s Moon Mineralogy Mapper has confirmed
2
5
WWW.KALVIKURAL.COM
that moon was once completely molten.
• European Space Agency payload- Chandrayaan-1 imaging
X-ray spectrometer (CIXS) detected more than two dozen
weak solar flares during the mission.
• The terrain mapping camera on board Chandrayaan-1 has
recorded images of the landing site of the US space-
craft
Apollo-15, Apollo-11.
• It has provided high-resolution spectral data on the
mineralogy of the moon.
• Lunar Laser Ranging Instrument (LLRI) covered both the
Lunar Poles and additional lunar region of interest.
• The X-ray signatures of Aluminium, magnesium and
silicon were picked up by the CIXS X-ray camera.
• The Bulgarian payload called Radiation Dose Monitor
(RADOM) was activatedon the very same day of its launch
and
worked till the mission ended.
• More than 40,000 images have been transmitted by
Chandrayaan camera in 75 days.
• The Terrain Mapping Camera acquired images of peaks
and craters. The moon consists mostly of craters.
• Chandrayaan beamed back its first images of the Earth
in its entirety.
• Chandrayaan-1 has discovered large caves on the lunar
surface that can act as human shelter on the moon
1
1
1
1
1
Any five
points
55.
a.
b. This diagram represents AC Generator. c. ABCD - rotating rectangular coil NS - two poles of a permanent magnet.
S1 and S2 - two slip rings
B1and B2 - two conducting stationary brushes
R - Resistance.
d. Electromagnetic induction.
2
1
1
1
5
PREPARED BY
BIOLOGY - M.G.RAYMOND, M.Sc.,B.Ed.
[email protected] 9629705161 / 9442980841
PHYSICAL SCIENCE – A.JOHNSON PRABHU, M.Sc.,B.Ed.
[email protected] 9159713063
ST.PAUL’S MAT. HR. SEC. SCHOOL,
WWW.KALVIKURAL.COM
BLOCK-4, NEYVELI-607801.