prepared · sslc revision exam - i 29.01.2018 science - key answers prepared by m.g raymond...

SSLC REVISION EXAM - I 29.01.2018

SCIENCE - KEY ANSWERS

PREPARED BY M.G RAYMOND & JOHNSON PRABHU, ST.PAUL’S MAT. HR. SEC. SCHOOL, BLOCK-4, NEYVELI. 9442980841 /9629705161

TIME ALLOWED : 2 ½ Hrs MAX. MARKS : 75

SECTION – I

CHOOSE THE CORRECT ANSWER

Q.No. ANSWER MARK Q.No. ANSWER MARK

1 Beta 1 9 Magnesium Hydroxide 1

2 BCG 1 10 Mg 1

3 Pachytene 1 11 Carbon 1

4 Seed 1 12 Distance 1

5 Pulmonary veins 1 13 4 K 1

6 Chloroplast 1 14 15 km / hour 1

7 Denmark 1 15 Convex mirror 1 8 20 % 1

SECTION –II – ( 40 MARKS )

Q.No. Answer Division

of mark

Total

mark

16

Haploid: A cell or organism having a single set or half number of chromosomes is

known as haploid. Diploid: A cell or organism having a two sets or double number of chromosomes is

known as diploid

1

1

2

17.

a) Somatic variation pertains to body cells and it is inherited. – False.

Corrected statements : Somatic variation pertains to body cells and it is not inherited. b) The genotype of a character is influenced by factors called chromosomes. – False

Corrected statements : The genotype of a character is influenced by factors called genes.

1

1

2

18. Interferon -Antiproteins of Bacteria 2 2

19.

1. Inflammation of upper respiratory passage – nasal epithelium.

2. Flow of mucous.

3. Headache, slight rise in temperature, etc. ( Any two points)

1

1

2

20.

Types of Neuron

DIAGRAM

1 PARTS

1

2

21

a) Autochory Balsam

b) Anemochory Tridax

c) Hydrochory Lotus

d) Zoochory Xanthiun

½

½ ½

½

2

22.

The nocturnal bat can fly without crashing into things and still capture insects by

echo location. As a bat flies, it emits a rapid series of extremely high pitched

clicking sounds. The sound waves bounce off objects or flying insects and the bat

hears the echo.

2 2

23.

No. Arteries Veins

1. Arteries carry the blood from the heartto different parts of the

body.

The veins carry the blood from different

parts of the body to the heart.

2. All the arteries carry oxygenatedblood except pulmonary artery

which carries deoxygenated blood.

All veins carry deoxygenated blood except the pulmonary vein

which carries oxygenated blood.

3. Arteries are thick walled. Veins are thin walled.

4. Arteries are mostly deeply situated. Veins are mostly superficially situated.

½

½

½

½

2

24. (i) Both ‘A’ and ‘R’ are true and ‘R’ explains ‘A’. 2 2

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25.

i. A- Xylem B - Phloem

ii.The upwards movement of water (Ascent of sap) takes place with the help of the

process transpiration. Evaporation of water molecules from the cells of a leaf

creates a suction which pulls water from the xylem cells of roots.

½ + ½

1

2

26.

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

27. The change that occurs in a touch-me-not plant when it is touched.

If we touch the touch-me-not plant at one point, all the leaflets show the folding

movement. This indicates that the stimulus at one point is communicated. The

folding effect of touch-me-not plant is caused by a change in the turgidity of the

leaflets brought about by the movement of water into and out of the

parenchymatous cells of the pulvinus or swollen leaf base.

2 2

28. i) Animals give out CO2 through respiration. ii) In the presence of sunlight , plants prepare Carbohydrate ( food)

1

1 2

29. B) (A) is correct but (R) is wrong. 2 2

30. i. Petroleum

Reason : Petroleum is a fossil fuel.

Bio alcohol, Green diesel and Bio ethers are bio fuels.

ii. Scabies

Reason : Scabies is water washed disease.

1

1

2

31 Benefits of household waste water recycling systems:

1. Less fresh water usage

2. Reduce stain in septic tanks

3. Recharge ground water

4. Encourage plant growth

½ ½

½

½

2

32

½

½

½ ½

2

33. i. Beaker B

ii. Sugar mixed with water is homogeneous in nature(beaker A)

1

1 2

34. Gas Atomic mass Molecular mass Atomicity

Ozone 16 48 3

Nitrogen 14 28 2

1

1 2

35. a. Decomposition reaction b. Combination reaction

1

1 2

36. S.No. Source Acid present 1 Apple Malic acid 2 Lemon Citric acid 3 Grape Tartaric acid 4 Tomato Oxalic acid

4 x ½ 2

37. a. 91.6% b. The term "chalcogens" was derived from the Greek word chalcos ,meaning "ore formers,"

2 2

38. i. Household utensils ii. Electrical cable industry

1

1 2

39. I. Invertase Ii. Ammonium sulphate or ammonium phosphate

1

1 2



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40. a. Action b. Reaction

1 1

2

41. i. The law of conservation of momentum. ii. Newton’s third law of motion.

1 1

2

42.

4*1/2 2

43. s.no scientist invention

1 Faraday Dynamo

2 George Simon ohm Ohm’s law

3 Volta First battery

4 Henry Becquerel Radioactivity

4*1/2 2

44. Fuse made up of an alloy (37% Lead, 63% Tin) which has high resistance and low melting point.

1

1 2

45. Focal length of concave lens, f = - 2 m Power of the lens, p=1/f 1 = ----- = -0.5 dioptre -2

2 2

46. Myopia is also known as nearsightedness. A person with myopia can see nearby

objects clearly but cannot see the distant objects distinctly This defect can be

corrected by using a concave lens of suitable power.

1

1 2

47. a. Iris

b. Retina 1+1 3

SECTION – III ( 20 MARKS)

Q.No. Answer Division

of Mark

Total

Mark

48.

1.Protein Deficiency diseases

Disease Symptoms

1.Marasmus The child loses weight and suffers severe

diarrhea and it will appear as though bones are

covered by skin.

2.Kwashiorkar The child develops an enlarged belly with face

and feet swelling.

2.Vitamin Deficiency Disease

Vitamin Deficiency disease Symptoms

Vitamin A Nyctalopia Night blindness

Vitamin D Rickets Defective calcification

ofbones

Vitamin E Sterility Inability to reproduce

Vitamin K Haemorrhage Profuse loss of blood

Vitamin B1 Beri-Beri Nervous disorder

Vitamin B5 Pellagra Dementia, dermatitis,

diarrhea

Vitamin B12 Pernicious anemia Destruction of RBC

Vitamin C Scurvy Bleeding gums and

loosening of teeth

2

3

5



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49.

Various parts of the human brain and their functions.

The brain is the central information processing organ and acts as the

command and control system.

The human brain as in the case of other vertebrates, is divided into three

major parts:

a) Forebrain b) Midbrain and c) Hindbrain

a.Forebrain

The forebrain consists of

1.Cerebrum 2.Thalamus and 3.Hypothalamus.

Functions of Cerebrum

Cerebrum is the seat of consciousness, intelligence,memory, imagination and

reasoning. It receives impulses from different parts of the body and initiates

voluntary activities. Specific areas of cerebrum are associated with specific

functions. Thus there is a respective centre for hearing, seeing, tasting,

smelling, speaking and so on. A damage in a specific centre of the cerebrum

will deprive the particular part from carrying out its functions.

Functions of Thalamus

The cerebrum wraps around a structure called thalamus – a major conducting

centre for sensory and motor signaling.

Functions of Hypothalamus

It lies at the base of the thalamus. It controls body temperature, urge to eat

and drink, the regulation of sexual behavior and expresses emotional

reactions like excitement, anger, fear, pleasure and motivation.

b.Midbrin

The midbrain is located between the thalamus and the hindbrain. A canal

called cerebral aqueduct passes through the midbrain. The dorsal portion of

the midbrain consists of four hemispherical bodies called corpora

quadrigeminawhich controls and regulates various visual reflexes and

optical orientation.

c. Hindbrain

The hindbrain comprises

1.Cerebellum 2.Pons and 3.Medulla oblongata.

Functions of Cerebellum

Cerebellum regulates and coordinates the group movements of voluntary

muscles as in walking or running.

Functions of Pons

It is the bridge of nerve fibres that connects the lobes of the cerebellum. It

relays the information from the cerebrum to the cerebellum. It also contains

the sleep and respiratory centres.

Functions of Medulla oblongata

Medulla is the posterior most part of the brain where it merges with the

spinal cord. It acts as a coordination pathway for both ascending and

descending nerve tracts. Medulla is the centre for several reflexes involved

in the regulation of heart beat, blood vessel contraction, breathing, etc.

1

1

1

1

1

5

50. The two events involved in the sexual reproduction of a flowering plant are

1.Pollination and 2.Fertilization

i) The first event is Pollination.

Pollination: The transfer of pollen grains from the anther to stigma

of a flower is called pollination.

Types of Pollination :Pollination is of two types. They are:

1. Self pollination and 2. Cross pollination

1.Self Pollination (Autogamy)Self pollination is also known as autogamy.

The transfer of pollen grains from the anther of a flower to the stigma of the

same flower or another flower of the same plant is known as self pollination.

1

1

1

5



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2.Cross Pollination (Allogamy)The transfer of pollen grains of a flower to

the stigma of another flower of a different plant of the same species is called

crosspollination or allogamy.

ii) Advantages of self pollination

1. Self pollination is certain in bisexual flowers.

2. Flowers do not depend on agents for pollination.

3. There is no wastage of pollen grains.

Disadvantages of self pollination

1. The seeds are less in number.

2. The endosperm is minute. Therefore, the seeds produce weak plants.

3. New varieties of plants cannot be produced, resulting in the degradation

ofthe plant.

Advantages of cross pollination

1. The seeds produced as a result of crosspollination, develop and germinate

properly and grow into better plants, i.e. cross pollination leads to the

production of new varieties.

2. More viable seeds are produced.

1

1

51. Measures to be taken to deal with the problem of water scarcity.

i) Seeding clouds

Seeding clouds with dry ice or potassium iodide particles sometimes can

initiate rain, if water laden clouds and conditions that favour precipitation are

present.

ii) Desalination: (Reverse osmosis)

Desalination of ocean water is a technology that has a great potential for

increasing the supply of fresh water. Desalination is more expensive than

most other methods of obtaining fresh water. In desalination, the common

methods of evaporation and re-condensation are involved.

iii) Dams, Reservoirs and Canals

Dams and storage reservoirs trap run-off water in them and transfer the water

from areas of excess to areas of deficit using canals and underground pipes.

iv) Water Shed Management

The management of rain water and the resultant run-off is called water shed

management. Water shed is an area characterized by construction of small

dams to hold back water which will provide useful wildlife habitat and stock

watering facilities.

v) Rain Water Harvesting

Rain water harvesting essentially means collecting rain water from the roof

of buildings or courtyards and storing it underground for later use. The main

idea in harvesting rain water is to check the run-off water. The rain water

that falls on the roofs of buildings or in courtyards is collected through pipes

and stored in under ground tanks of the buildings fitted with motor for

drawing the water for use. The process of rain water harvesting is not only

simple but also economically beneficial. It helps in meeting the increased

demand for water, particularly in urban areas and prevent flooding of living

areas.

vi) Wetland Conservation

It preserves natural water storage and acts as aquifer recharge zones.

vii) Domestic Conservation

As an individual, everyone can reduce the water loss by using a bucket of

water than by taking a shower, using low-flow taps, using recycled water for

lawns, home gardens, vehicle washing and using water

conserving appliances.

viii) Industrial Conservation

Cooling water can be recharged and waste water can be treated and reused.

1

1

1

1

1

5



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52. a. Gram molecular mass of H20 2(H) = 2*1 = 02 1(O) = 1*16 = 16 ----- gram molecular mass of H20 18 g ------- b.

Atom Molecules The smallest particle of an element that can take part in a chemical reaction

The smallest particle of an element or a compound that can exist freely.

an atom is a non bonded entity. A molecule is a bonded entity. An atom may or may not exist freely. An molecule can exist freely

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53.

Characteristics of Homologous series I. Each member of the series differs from the preceding or succeeding member by a common difference of CH2 and by a molecular mass of 14 amu. Ii. All members of each homologous series contain same elements and same functional groups. iii. All members of each homologous series have same general molecular formula. e.g. Alkane = CnH2n + 2

Alkene = CnH2n

Alkyne = CnH2n – 2

Iv. The members in each homologous series show a regular gradation in their physical properties with respect to increase in molecular mass. v. The chemical properties of the members of each homologous series are similar. vi. All members of each homologous series can be prepared by using same general method.

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54. a, First law of motion states that if there is no force, there is no change in state of rest or of uniform motion. Eg. A book placed on a table will never move on its own unless compelled to change that state by an applied unbalanced force. Objects will not change their velocities unless they are forced to by forces.

∴ Newton’s 1st law of motion gives a qualitative definition of force

b. Before explosion mass of a bomb m = 3kg velocity of a bomb u = 0m/s After explosion mass of 1st part m1

= 2kg mass of 2nd part m2 = 1 kg velocity of 1st part v1 = 3m/s velocity of 2nd part v2 = ? Momentum p (Before explosion) = Momentum p(After explosion) mu = m1v1 + m2v2 3*0 = (2*3) +(1*v2) 0 = 6+(1*v2) -6 = v2 1 -6 m/s = v2 (negative sign indicates the direction, right to left) ∴ velocity of 1kg mass will be -6m/s

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55. i. Given data:

Radius of Curvature R=-30cm

focal length, (f)= =-15cm

h1=5cm

u =-10cm

v =?

Nature of the image: The object is placed at μ=10cm i.e, between F and O of the lens. Hence the image formed is virtual, enlarged and erect.

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Position of the image:

Position of the image is behind the mirror at the distance of 30cm. Size of the image

ii. Ray diagram

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PREPARED BY M.G RAYMOND & JOHNSON PRABHU ST.PAUL’S MAT. HR. SEC. SCHOOL, BLOCK-4, NEYVELI. 9442980841 /9629705161



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prepared · sslc revision exam - i 29.01.2018 science - key answers prepared by m.g raymond...

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