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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

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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

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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

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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

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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

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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.

raymondmg2001@gmail.com 9629705161 / 9442980841

PHYSICAL SCIENCE – A.JOHNSON PRABHU, M.Sc.,B.Ed.

Johnsonprabhu23@gmail.com 9159713063

ST.PAUL’S MAT. HR. SEC. SCHOOL,

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BLOCK-4, NEYVELI-607801.