Answers for Value Based Questions - Class X Science
Chapter-1
CHEMICAL REACTION AND EQUATIONS
Ans 1. (i). Junk food makes
the person obese.
(ii). He/She may suffer from
loss of apetite.
(iii). He/She may develop the
problems related to his/her physical or mental growth
(iv). It leads to wastage of
money.
Associated Value : The learner will be able to understand the benefits of
healthy food habits.
Chapter-2 ACID, BASES AND
SALTS
Ans 2. We should brush our teeth twice a day as bacteria
present in the mouth produce acids by degradation of sugar and food particles
remaining in the mouth after eating. The best way to prevent this is to clean
the mouth using toothpaste which are generally basic. These can neutralise the
excess acid and prevent tooth decay.
Associated Value : The learner will be motivated to keep her teeth
properly cleaned.
Ans 3. Plants require a specific pH range for their healthy
growth by using a large no. of pesticides and fertilizers pH of the soil
changes which make it more acidic or basic. So in the long run the soil becomes
infertile. This leads to soil erosion causing a damage to the environment also.
So use of these pesticides and fertilizers should be restricted.
Associated Value : The learner understands the need to wash her
vegetables and fruits properly before eating them.
Chapter -3 METALS AND
NONMETALS
Ans 4. i We should always purchase the Gold jewellery from
a branded shop with proper receipt and Hall Mark certificate.
ii. Govt. insists on purchasing
hall marked jewellery as it contains the gold and its alloyed metal (ie. Copper
or silver) in a fixed ratio.
Associated Value : They will be more careful and educated and thus can‟t be befooled easily while shopping jewellery and
other products.
Ans 5. The rusting of iron can be prevented by painting ,
oiling greasing, galvanising, chrome plating, anodising or making alloys.
Associated Value : The learner will be able to escape from the economic
loss of metallic objects by keeping them corrosion resistant.
Ans 6. Equipments contained Mercury should be handled
carefully
. If broken or discarded their
disposal should be done carefully.
Associated Value : The learners will handle & dispose such poisonous
items more carefully.
Chaper-4. CARBON AND ITS
COMPOUNDS
Ans 7. a).The inlets for air in stove get blocked which leads
to yellow flame.
b). This problem is harmful for
our environment as incomplete combustion results in the formation of oxides
which are major pollutants of our environment.
c). For preventing this
situation gas or stove burners should be cleaned time to time.
Associated Value : Eco-friendly habits will be inculcated among the
learners.
Ans 8. By sensitizing the people about the harmful effects of
liquor consumption.
By making poster, banners and
writing articles on this issue.
By not getting attracted towards
this habit and to stop my friends also to keep control on themselves to condemn
alchololism.
Associated Value : The learners understand the bad effects of Alcoholism
and also start try to discourage this practice in the society.
Ans 9. Vegetable oils contain unsaturated fatty acids which
are healthy and decrease the cholesterol level in our blood. That is why we
should use vegetable oils for cooking. Cooking oil should be selected in such a
manner that it should contain low cholesterol.
Associated Value : The learners will be able to adopt healthy food habits
once they understand that animal fats produce more cholesterol than vegetable
oil.
Chapter – 5 PERIODIC CLASSIFICATION OF ELEMENTS
Ans 11. Organisation makes our life simple, easy and
systematic.
As classification and
organization help us in our daily life in the same way classification of
elements has make the study of elements easier and simple.
We can know about the
properties of elements because of this classification.
Associated Value : The learner will be motivated to adopt well
disciplined and organized life.
Ans 10
(i) By sensitizing people about
adulteration.
(ii) Small amount of
pebbles/impurities are mixed in pulses.
(iii) When we wash the pulses
the impurities float on the water.
Associated Value : The learner will become more vigilant towards Food
adulteration and they start try to check this menance.
Chapter-6 LIFE PROCESSES
Ans 12.
(i). Prefer and enjoy eating
fruits and vegetables.
(ii). Choose a diet that
provide enough calcium and iron and proteins to meet their growing body‟s requirements.
iii. Add fresh vegetables to
pizzas, burger, if you cant avoid eating them.
Associated Value : The learners will go for healthy food habit once they
understand the harms of taking Fast and junkfood.
Ans 13.
(i). A good, regular exercise
keep diabetes under check.
(ii). Exercise is also crucial
to those who are obese or overweight.
(iii). Weight traning exercises
increases uptake of calcium In the bones and help in preventing osteoporosis
(Bone disease).
iv. Regular exercise also
reduces bad cholesterol in our body and helps in improving the function of the
heart.
Associated Value : The learners will be motivated to take up sports
activities more regularly to keep them healthy.
Ans-14. (i). No the steps taken by Rahul was not right.
(ii). It can lead to addiction
and can affect the health adversely.
Associated Value : The learners will be discouraged to get influenced
trom other of taking any food supplements that harm their health
Ans 15.Om developed Stomach ache as he had not chewed his
food properly. Chewing food properly helps in proper breakdown of food and
mixing it with saliva
. Large food pieces if enter
the stomach might cause damage.
Associated Value : The learners will start chewing their food properly
for healthy digestion.
Ans 16. i. Meena is suffering from Anaemia.
ii. She should take fruits and
vegetables (Spinach) which is rich in iron. Iron is an essential component of
hemoglobin and is required for its proper functioning.
Associated Value : The
learners will be motivated to take the balanced diet especially rich with
protein & Iron to keep their Haemoglobin level in the required range.
Ans 17.(i). Respiratory system/lungs will get affected.
(ii). a. Factories should treat
harmful waste & filter it before releasing it in the environment.
b. Less polluting fuels like
CNG should be used in vehicles.
c. Regular pollution check and
proper service and maintenance should be done for private vehicles.
Associated Value : The learners will start taking up more eco-friendly
transit system like metro to travel besides advocating car pool among others.
CHAPTER-7. CONTROL AND
COORDINATION
Ans 18.
1. Goitre/Thyroid related
disease.
2. Iodine present in iodised
salt is needed to produce thyroxin hormone.
Associated Value : The learners will only take up Iodised salt in their
meal in order to check Iodine deficiency disease.
Ans 19 (i) No.
(ii)Intake of such contaminated
milk may cause various health disorders.
Associated Value : The learners will become more vigilant while taking
milk or milk products and would prefer to take them from registered outlet like
Mother Diary, DMS etc.
Ans 20.
1. Spread awareness that blood
donation is a healthy social habit.
2. Sensitizing and encouraging
the people with the help of Nukkad Natak, Media etc. to participate in blood
donation camp.
Associated Value : It will motivate the learner in believing that the
blood donation is a social value and duty of human being.
Ans 21.
(i) Diabetes (Type-II)
(ii) Regular exercise, taking
Balanced diet avoid sweet food item, cola etc.
Associated Value : The learner will understand that Diabetes is a life
style disease and will be encouraged to adopt a life style with balanced diet
and regular exercise to keep such diseases away from them.
Ans 22.Good habits to beat the exam stress:
(i) Regular study hours.
(ii) Taking balanced /light
diet.
(iii) Exercise /walk with good
speed in the morning /evening.
(iv) Regular breaks.
Associated Value : The learners will be able to cope exam stress in a
more better way by following disciplined & planned studies.
Ans 23. Adolescence brings about the hormonal secretion among
teenagers. This leads to some physical and emotional changes among them which
are difficult to bear by them.
2 (i). Proper counseling of
teenagers should be arranged from the counsellor.
(ii). Healthy communication
with parents.
(iii). Teenagers should be
properly motivated to set realistic goals.
Associated
Value : The
learner will be able to handle various challenges of adolescent stages in a
more better way.
Chapter-8 HOW DO ORGANISMS
REPRODUCE?
Ans 24.Approach of society is baseless. Sex of child is
determined by type of chromosome present in sperm (X or Y) that fuses with ovum
at time of fertilization.
Associated Value : The learner will be able to improve their mindsets
that help them to discontinue various social malaise viz gender inequality,
female foeticide etc.
Ans 25. 1. Absolutely not.
Human approach/behavior
One should be aware about the
mode of transmission of disease, danger of sharing needles etc.
Associated Value : The learners will understand that only a generous and
improved mindset of society can help the people to fight HIV/AIDS related
problems.
Ans 26 (i) Placenta.
(i) Would be mother should eat
healthy balanced nutritious diet, should be stress free.
(ii) She should not take any
medicine without proper doctor‟s advice.
Associated Value : The learner will appreciate the idea that it is very
important for all of us to help in maintaining good health of the pregnant
lady.
Ans 27 This will prevent himself from contracting various STD‟s as well as spreading of diseases.
Associated Value : The learner will be motivated to maintain a good
reproductive health as well.
Ans 28.Big families can be one of the reasons/advantages of
having short family.
Associated Value : The learner will understand the fact that only small
family gets good health and education unlike that of a large family.
Chapter-7 CONTROL AND
COORDINATION
Ans. 29. He may get head enjury that may even prove fatal to
him.
2. Brain, Eye.
Associated Value : The learners will be encouraged to obey traffic rules
while traveling on the roads.
CHAPTER-10-11 LIGHT, HUMAN
EYE AND COLOURFUL WORLD
Ans 30 Don‟t Rub eyes.
Wash them properly and softly
Any other suggestions.
If broken or discarded their
disposal should be done carefully.
Associated Value : The learners will handle & dispose such poisonous
items more carefully.
Chaper-4. CARBON AND ITS
COMPOUNDS
Ans 7. a).The inlets for air in stove get blocked which leads
to yellow flame.
b). This problem is harmful for
our environment as incomplete combustion results in the formation of oxides
which are major pollutants of our environment.
c). For preventing this situation
gas or stove burners should be cleaned time to time.
Associated Value : Eco-friendly habits will be inculcated among the
learners.
Ans 8. By sensitizing the people about the harmful effects of
liquor consumption.
By making poster, banners and
writing articles on this issue.
By not getting attracted
towards this habit and to stop my friends also to keep control on themselves to
condemn alchololism.
Associated Value : The learners understand the bad effects of Alcoholism
and also start try to discourage this practice in the society.
Ans 9. Vegetable oils contain unsaturated fatty acids which
are healthy and decrease the cholesterol level in our blood. That is why we should
use vegetable oils for cooking. Cooking oil should be selected in such a manner
that it should contain low cholesterol.
Associated
Value : The
learners will be able to adopt healthy food habits once they understand that
animal fats produce more cholesterol than vegetable oil.
Chapter – 5 PERIODIC CLASSIFICATION OF ELEMENTS
Ans 11. Organisation makes our life simple, easy and
systematic.
As classification and
organization help us in our daily life in the same way classification of
elements has make the study of elements easier and simple.
We can know about the
properties of elements because of this classification.
Associated Value : The learner will be motivated to adopt well
disciplined and organized life.
Ans 10
(i) By sensitizing people about
adulteration.
(ii) Small amount of
pebbles/impurities are mixed in pulses.
(iii) When we wash the pulses
the impurities float on the water.
Associated Value : The learners will follow the tips to maintain the good
eye care.
Ans 31. Yes,, Independent view of student.
Associated Value : The learners will be motivated/inspire to appreciate
the idea of organ donation in their life.
Ans 32. Myopia (Reason)
Get the proper check up for the
eyes.
Should wear spectacles as
recommended by doctor.
Associated Value : The learners will be able to handle eye sight disorder
if any in their life.
Ans 33. Yes
Yes
Independent view of a student.
Associated Value : The learners will understand the fact that the urban
people will have to keep their city clean & pollution free if they wish to
experience some beautiful natural events viz twinkling of star, a rainbow
etc.
Ans 34. Refractioin
Explanation of Refraction.
Never try to catch or hold
anything in deep water, As it appears nearer them it actual position.
Associated Value : The learners will be encouraged to obey rules strictly
to avoid life risk during recreational activities like boating etc.
Ans 35.Yes/Self introspection is esstential.
Associated Value : The learners will be able to tackle the adolescent
challenges developed due to enormous physical and emotional changes in their
life during this stage.
Chapter 12-13 ELECTRICITY,MAGNETIC EFFECTS OF ELECTRIC CURRENT
Ans. 36 Definition of short circuiting
Use fuse, connecting wire
should be of good quality, wire should be properly insulated externally.
Associated Value : The learners will become more educated to handle
emergency situation like electric fire more carefully.
ANS 37. Earth wire is not used
Explain function of earth wire
Its colours, need of connecting
metallic appliances with earth wire.
Associated Value : The learners will be more careful and vigilant while
handling electric gadgets to avoid electric shocks.
ANS 38 Fuse
Yes, function & application
of FUSE.
Associated Value : The learners will be able to understand and appreciate
the importance of electric fuse in domestic circuit.
ANS 39 : No, electricity theft is not good.
Proper connection, billing,
safety measure can save both property and life which is more precious.
Associated Value : The
learners will be able to appreciate the role of being a responsible citizen and
not to involve in any unlawful and risky events like electric thaft etc.
ANS 40 No Yes it will affect the economical condition of
family as well as the nation
Because both renewable and
mostly non-renewable sources of energy is used to generate large amount of
electricity. We should conserve the energy.
Associated Value : The learners will be able to encouraged to adopt
eco-friendly attitude which also a need of hour.
Chapter – 14 SOURCE OF ENERGY
ANS 41 No, excessive use of fossil fuel, pollute the
environment, and fossil fuels are non renewable source of energy.
Can use car pool.
Associated Value : The learners will appreciate and adopt the idea of
traveling in MRTs (Metro) and favour car pool so that they can also play a role
in promting eco-friendly life style.
ANS 42 i. Heat evolved during nuclear fission
ii. a. Damage to property &
life
b. Genetical Disorder
c. Infertile soil
iii. Pros & cons of nuclear
energy.
Associated Value : The learners will be more educated and careful towards
safety measurers against nuclear hazards.
ANS 43 Second village
Qualities of Bio gas fuel.
Associated Value : The learners will appreciate the practice of adopting
renewable sources of energy like CNG, Biofuel, solar energy by the people.
ANS 44 Renewable source of energy
Saving
of electrical energy, money
Non-polluting
Associated Value : Same as in 43.
ANS 45 Use of renewable sources of energy
Population control
Planning trees (afforestation)
Any other point according to
the student.
Associated Value : The learners will be encouraged to play their role as
a responsible citizen in the conservation of energy resources.
Chapter – 15 OUR ENVIRONMENT
ANS 46 Fossil fuel – non renewable
Traveling in Metro (MRTS) /
Public transport
Opting for CNG as a motor
fuel instead of petrol & diesel.
Associated Value : The learners will adopt all these fuel saving
techniques in their life.
ANS 47 i. Scavenger
ii. Help in recycling in nature
by eating dead animals.
Associated Value : The learners will be able to understand and
participate in maintaining ecological Balance by not harming other creatures.
ANS 48 1. Chemicals (Pesticides, Fertilizers) used in
agricultural practices.
2. Biological magnification.
Associated Value : The learners will be able to apply rational approach
while using such pesticides & will be more careful towards using packaged
food.
ANS 49 1. Chlorofluoro carbon (CFCs) released into atmosphere
disintegrate the ozone molecule.
2.Stop using devices that
release CFCs.
Associated Value : The learners will be more educated and will be more
vigilant & judicious towards using equipments /chemical that produces CFCs
in order to protect ozone layer.
ANS 50 1. Oxides of Nitrogen & sulphur released from
vehicular & industrial emissions on mixing with rain water produces acid
rain.
2. Traveling in metro (MRTS)
instead of fossil fuel driven vehicles.
Associated Value : The
learners will adopt Eco-friendly lifestyle so that lesser amount of (No)x and
(So)x released into atmosphere which are the main contribution factor causing
Acid Rain.
ANS 51 i Environmental pollution
Burning plastics can cause
pollution
Plastic cause harm to the
cattle / animals if enter inside their alimentary canal.
ii. Paper bags / jute bags can
be used instead of plastic bag.
Any other relevant view of the
student
Associated Value : The learners will be discouraged to use plastics as a
source of packaging, storing as it is non biodegradable.
Chapter 16 Management of
Natural Resources
ANS 52 1. Yes
2. Yes
3 Chipko movement has
challenged the old belief that forests are meant only for timber. Gift of trees
to us is soil, water, oxygen.
Associated Value : The learners will be motivated for Tree plantation
drive and will be discouraged to be a part in reckless cutting of trees.
ANS 53 1. Good initiative approach of reuse
2. Sensitizing general public
towards community
Associated Value : The learners will become more socially responsible
citizen by contributing their share towards much generous acts of society
towards their under privileged fellows.
ANS 54 1. Growing plants and trees in the open area in the
school.
2 Arrangement for water
harvesting
3. Reporting any kind of water
leakage in the school.
Associated Value : The learners will be motivated to act like a eco-club
members and participate actively in its all environment saving activities.
ANS 55 1. Yes
2. Global warming, degradation
of environment health hazards.
Associated Value : The learners will appreciate the fact that rational
use of natural resourses is their responsibilities towards saving has nature for
future generations as well.
ANS 56 1. Agreed
2. One should minimize use of
water, should not keep the taps open when not in use, should use bucket of
water for cleaning purpose for taking bath, as these practices consume less
water.
Associated Value : The learners will start using water resources more
judiciously to avoid its waste.
ANS 57 1 Trees are the basis of human and animal life; no
life can exist without them. We are directly or indirectly dependent on the
trees for all our requirements.
2. We can protect trees by
taking care of these. By reducing our needs and by not wasting the paper.
3. mahotsava is the festival
celebrated to enhance the plantation of trees.
Associated Value : Same as in 52.
ANS 58 1. Reusing means using the things again and again thus
without wastage of any energy we can use the things.
2. Old envelop can be reused.
Old news papers can be used to make cards, pots, decorative pieces etc.
3. By adopting the principles
of three „R‟s
we can make our selves Eco-Friendly.
Associated Value : The learners will be motivated to adopt 3 R‟s (Reduce, Reuse, Recycle) in their life to save her
environment.
ANS 59 Being a good citizen is more important than becoming a
successful business man because if we are not good citizen our action will take
our country towards destruction.
Associated Value : The learners will appreciate the fact that one should
not involve in any business gain activity which may also harm then environment.
ANS 60 1. By industrial waste.
By human activities.By not throwing waste materials
and garbage into water.
2. By sensitizing people about
harmful effects of water pollution.or any other methods.
Associated Value : The learners will become more responsible by
discouraging any activity in their life that may cause water pollution.
ANS 61 While visiting to tourist places we should not throw
garbage and waste materials.
1.
We should not try to temper with the natural beauty of that place.
Associated Value : The
learners will appreciate the very idea of keeping the tourist spot clean
whenever they visit their as these are our natural heritage.
ANS 62 1. Reduce reuse and recycle
2. By becoming Eco-friendly
By planting trees, by not
throwing garbage etc.
Associated
Value : Same
as in 58
