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Download CBSE Value Based Questions for CBSE Class 12 Biology Reproduction in Organisms Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction - asexual and sexual reproduction; asexual reproduction - binary fission, sporulation, budding, gemmule formation, fragmentation; vegetative propagation in plants.
Download CBSE Value Based Questions for CBSE Class 12 Biology Evolution Origin of life; biological evolution and evidences for biological evolution (paleontology, comparative anatomy, embryology and molecular evidences); Darwin's contribution, modern synthetic theory of evolution; mechanism of evolution - variation (mutation and recombination) and natural selection with examples, types of natural selection; Gene flow and genetic drift; Hardy - Weinberg's principle; adaptive radiation; human evolution.
Download CBSE Value Based Questions for CBSE Class 12 Biology Microbes in Human Welfare In household food processing, industrial production, sewage treatment, energy generation and microbes as biocontrol agents and biofertilizers. Antibiotics; production and judicious use.
Download CBSE Value Based Questions for CBSE Class 12 Biology Ecosystem Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy; nutrient cycles (carbon and phosphorous); ecological succession; ecological services - carbon fixation, pollination, seed dispersal, oxygen release (in brief).
Download CBSE Value Based Questions for CBSE Class 12 Biology Biodiversity and Conservation Concept of biodiversity; patterns of biodiversity; importance of biodiversity; loss of biodiversity; biodiversity conservation; hotspots, endangered organisms, extinction, Red Data Book, biosphere reserves, national parks, sanctuaries and Ramsar sites.
Class 12th Biology CBSE Value Based Questions in for free download in PDF format. The most CBSE Value Based Questions for annual examination from are given here for download. The additional questions for practice from XII class CBSE exam are collected from various sources. It includes questions asked in previous year exams, questions provided by Kendriya Vidyalaya KV schools, DoE, Delhi government school, Navodaya Vidyalaya samiti NVS and other government and private schools in India and abroad that are affiliated to CBSE, New Delhi. Class 12 Biology have different set of questions. The questions includes 1 mark questions, 2 mark questions, 3 mark questions, 4 mark questions, 5 mark questions and other questions as per the latest CBSE curriculum for the current session.
CBSE Value Based Questions, guess papers, most expected questions and best questions from 12th Biology have CBSE chapter wise CBSE Value Based Questions with solution for free download in PDF format. 12th Biology have many topics. All these topics are included in CBSE chapter wise Value Based Questions of class 12 Biology.
Biology Solved CBSE Value Based Questions for 12th Chapter Wise CBSE
Class XII Biology NCERT book, refresher books and other reference books have many CBSE Value Based Questions. These questions are repeatedly asked in exams in one or other way round. Practicing such most CBSE Value Based Questions certainly help students to get good marks in exams. The solved question papers from have all type of questions may be asked in annual exams such as VSA very short answer type questions, SA short answer type questions, LA long answer type questions, VBA value based questions and HOTS higher order thinking skill based questions.
CBSE Value Based Questions and Answers for CBSE Exams
1. Taren was one of the best boys in the class. In spite of his efforts he was not doing well in class XI. His father wanted him to qualify for medical sciences. He got frustrated with his results and resorted to drugs. He started misbehaving with parents and friends in school.
His friends started neglecting him. The school authorities counselled Taren but to no
effect. His parents were upset and took him to a rehabilitation center. After a few months
he came back recovered.
a) What values did the Principal reflect through his initiative?
b) What is drug abuse?
c) Name some commonly abused drugs and their source.
d) What should be the attitude of his parents after his return? 1+1+2+1
Ans-a) The Principal showed his social liability and responsibility.
Ans-b) Intake of drugs for a non- medical purpose in the dose, strength, frequency and the
way of taking which impairs mental and physical functions of human being is drug
Ans-c) i) Opium: from plant Papaver somniferum- its derivatives includes
morphine, codeine, heroin, smack i.e brown sugar etc.
Cocaine: from Erythroxylon coca, crack - a cocaine derivative, caffeine
from Thea sinensis, Coffea Arabica, Theobroma cacao
LSD: from fungus Claviceps purpurea
Ans-d) Parents should be compassionate and more caring towards the child and behave
2. Joy loves to play football and was selected as captain of the school team for the district
level tournament. He also does social work. He attended a blood donation camp to donate
blood and came to know that he was HIV positive. He lost interest in games and refused to
play or study. He started counting his days. He remained absent from school for a long
time. The Biology teacher visited his house and counselled him. Joy was back at school and
also played the tournament.
a) What sense of responsibility did the Biology teacher exhibit?
b) A person detected to be HIV positive should be isolated in the society? Do you agree?
Why/ Why not?
c) How is AIDS not spread?
Ans-a) The teacher shows social and moral responsibility along with his commitment to
service as a professional teacher.
AIDS is not a contagious disease and does not spread until a blood/ body fluid
contact is established.
Ans-c) AIDS is not spread by: body contact in crowded place, hand shaking, sharing
telephone, meal, utensil or clothings, light kissing, using same toilet seat or even
swimming pool. It is not transmitted by blood sucking vectors or by coughing and
3. Ratan lives in a remote village. Suddenly he comes to know that his father has arranged
the marriage of his younger sister, who is only 14 years old, to a well- to -do middle aged
man living in a nearby village. Ratan objected to his father’s act. Ratan was not convinced
by his father’s idea that a better groom might not be available later. Ratan complained to
the village head and got the problem solved.
a) Did Ratan act properly by approaching the village head? Why/ Why not?
b) What biological considerations made Ratan object to his father’s decision?
c) What values and responsibilities did Ratan show?
Ans-a) Yes, it was necessary to stop the act since as per the government order, the
minimum marriageable age of a girl is 18 years.
Ans-b) Ratan thought of the following Disadvantages of ealy marriage: (Any two)
Forced sexual relation and denial of freedom with restriction to family bindings.Domestic violence
Denial of education
Reproductive health problems
Child birth associated trauma
High postnatal mortality
Population pressure, health costs, human development loss
Ans-c) Sense of responsibility and consciousness for his family and respect of government
laws. He expressed his views boldly for the right cause.
4. During a visit to Kedarnath, Mohun came across a young couple staying in the adjacent
room in the hotel. He learnt that the couple had been visiting different temples and
performing rituals to get a child. Mohun was astonished and explained to them about ART
which he had recently studied in Biology. The couple were happy and understood their
wrong approach and thanked Mohun.
a) Identify the values which Mohun has shown.
b) What is ART? What are the various method included in ART?
c) What are the limitations for which ART is not commonly accepted?
Ans-a) Sympathetic attitude with alertness and practical approach.
Ans-b) Assisted Reproductive Technology
Methods are: i) test tube baby programme which includes IVF and Zygote orembryo transfer b) gamete intra fallopian transfer iii) Intra cytoplasmic sperm
injection iv) artificial insemination methods
Ans-c) 1. These techniques require extremely high precision handling by
specialized professionals and expensive instrumentation. Therefore,
these facilities are presently available only in a very few centres in the
2. Emotional, religious and social factors are also deterrents in the adoption
of these methods.
5. A teenage girl accidently became pregnant. She stopped coming to college and also
preferred to remain isolated. She was scared to inform her parents. One of her friends
Sweta met her and came to know about the problem. She took her to a doctor and got her
aborted. She convinced the parents and kept the matter concealed.
a) Did Sweta take the correct decision? What values did she show?
b) What is the medical term for abortion? What is the period which is considered safe for
c) What prevention may be taken to avoid pregnancy?
Ans-a) Yes. Sweta expressed her helpful attitude and true friendship. She had social
commitment and sensitivity to act as per the situation.
Medical termination of pregnancy (MTP) or Induced abortion.
It is safe up to the first trimester of pregnancy (12 weeks)
Ans-c) i) Abstinence
ii) Contraceptive methods
iii) Any other 6. On world population day Rohit and his friends arranged an awareness campaign
programme in their locality. Some elderly people rebuked the children and asked them not
to talk on such things in public. The children convinced the elders about the need for the
programme and on understanding their point of view, they also joined the campaign.
a) What values did the elderly people and Rohit show on the occasion?
b) Why is such awareness programme necessary?
c) What role has the government played in controlling population explosion?
Ans-a) Rohit and his friends show understanding of population explosion, team work and
Ans-b) To understand the problem faced by the family and the nation due to increasing
population, simultaneously the benefits of having a small family.
i) Public awareness through mass media
ii) Education at all levels
iv) Family planning
Increasing marriageable age (18 for girls, 21 for boys)v) Any other
7. Some parents wrote a complaint letter to the local municipality to remove all hoardings in
the city advertising the use of condoms and matters relating to AIDS prevention. The
children of these parents came to know about the matter and raised their voice against
removal of those hoardings. The parents were convinced by the awareness level of their
children and withdrew the complaint.
a) Parents considered the hoarding as sight pollution. Why do you disagree?
b) What value is promoted by the children protesting against their parents?
c) What are the methods by which AIDS spreads?
Ans-a) Since the awareness among our people has not reached to that extent that forceful
and constant reminding is not required. Our country is overpopulated and number
of AIDS is increasing too fast.
Ans-b) Sense of understanding AIDS and application in life, National responsibility and
commitment towards society.
iii) Unprotected sexual contact
Use of contaminated needles and syringes
Use of contaminated razors or other instruments used for piercing
body parts e.g. pinna
Transfusion of infected blood or blood products
vii) Any other 8. Rita and her parents were watching a TV serial in the evening. During a commercial break,
an advertisement flashed on the screen which was promoting use of sanitary napkins. Rita
was still watching the TV. The parents got embarrassed and changed the channel. Rita
objected to her parents’ behaviour and explained the need for these advertisements.
a) What values did the parents show?
b) Briefly describe the phases of a menstrual cycle.
Ans-a) The parents were traditional but understood the need for such advertisements.
They showed maturity and openness later.
9. Anita was happy when she gave birth to her first child. Her in- laws were dissatisfied at her
not giving birth to a male child and blamed Anita. Anita tried to convince her in laws that
she had no role in the child’s gender. They understood the biological reason but were yet
to be satisfied. Anita’s husband took up the matter and convinced the parents.
a) What values did Anita’s husband show in the above situation?
b) What governs sex determination in humans? How is it different from birds?
c) Why can’t Anita be blamed for not giving birth to a male child?
Ans-a) Strong and determined personality with responsibility towards the family and
Respect for elders.
Sex chromosomes. In human males it is XY and in female it is XX
In birds, male is ZZ while female is ZW.
Human females are homogametic i.e. produces only one type of gametes containing 22+X
Chromosomes only. Males are heterogametic and produce two types of gametes 22+X and
Ans-c) 22+Y. It is the type of male gamete which determines the sex of the fetus. If X
chromosome containing sperm fuses with the egg, it produces a female child whereas if Y
chromosome containing sperm fuses with the egg, it produces a male child.
10. Mrs. Kavita was eager to know the sex of the foetus which her daughter- in- law was
carrying. She was so anxious that she could pay any amount for that. The doctor refused to
disclose the result of the test.
a) What value do you learn from the doctor’s act?
b) How can one know the sex of the foetus? How is it done?
c) Why is disclosing the sex of the foetus banned in our country?
Phases:To write details of the
different phases describing the
i) Menstrual phase
ii) Proliferative phase
iii) Secretory phase
Ans-a) The doctor is devoted to his duties and has professional ethics.
Ans-b) By amniocentesis
The process – step wise
Ans-c) In the past there have been numerous cases where the female foetus has been
aborted. This anti -feeling for the girl child is considered a crime. The number of
females to males is thereby reduced.
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