ISC Biology 2019 Class-12 Previous Year Question Paper Solved

ISC Biology 2019 Class-12 Previous Year Question Paper Solved for practice. Step by step Solutions with Part-I, and II (Section-A,B and C). By the practice of ISC Biology 2019 Class-12 Solved Previous Year Question Paper you can get the idea of solving. Try Also other year except ISC Biology 2019 Class-12 Solved Question Paper of Previous Year for more practice. Because only ISC Physics 2019 Class-12 is not enough for complete preparation of next council exam. Visit official website CISCE for detail information about ISC Class-12 Biology.

ISC Biology 2019 Class-12 Previous Year Question Paper

-: Select Your Topics :-



Sections-A, Part- II,

Sections-B, Part- II,

Sections-C, Part- II,

Previous Year Question Paper  ISC Biology 2019 Class-12

Maximum Marks: 70
Time allowed: Three hours

(Candidates are allowed additional 15 minutes for only reading the paper. They must not start writing during this time)

  • This paper comprises two parts – Part I and Part II.
  • Answer: all questions.
  • Part I consists of one question of 20 marks having five subparts.
  • Part II consists of Sections A, B and C.
  • Section A consists of seven questions of two marks each.
  • Section B consists of seven questions of three marks each, and Section C consists of three questions of five marks each.
  • Internal choices have been provided in two questions in Section A, two questions in Section B and in all three questions of Section C.
  • The intended marks for questions or parts of questions are given in brackets [ ].

Part-1 (20 Marks),  Previous Year Question Paper  ISC Biology 2019 Class-12

answer all question

Question 1.
(a) Answer: the following questions briefly and to the point: [8 × 1] (i) Name the antibody which is most effective in allergies.
(ii) What is the function of GEAC?
(iii) What is a clone?
(iv) What do detritus food chains begin with?
(v) Give the full form of EFB.
(vi) How many chromosomes are present in meiocytes of a fruit fly?
(vii) Name the common ancestor of apes and man.
(viii) Give the scientific term used for the preservation of germplasm at a very low temperature.

(b) Each of the following sub-parts, (i) to (iv) has four choices. Choose the best option in each case: [4 × 1] (i) Eyelids in human foetus separate in :
(1) 14 weeks
(2) 16 weeks
(3) 24 weeks
(4) 40 weeks


(ii) Study the given monohybrid cross:
ISC Class 12 Biology Previous Year Question Papers Solved 2019 1

A test cross for this Fj will be:
(1) Tt × TT
(2) Tt × tt
(3) Tt × Tt
(4) TT × tt

(iii) Montreal Protocol aims at:
(1) Reduction of ozone-depleting substances
(2) Biodiversity conservation’
(3) Control of water pollution
(4) Control of CO2 emission.

(iv) In the given pedigree chart, the trait shown is:
ISC Class 12 Biology Previous Year Question Papers Solved 2019 2
(1) Autosomal dominant
(2) Autosomal recessive
(3) X-linked
(4) Y-linked

(c) Give one significant contribution of each of the following scientists: [4xl] (i) Wallace
(ii) R. Mishra
(iii) G. Gamow
(iv) Sanger

(d) Define the following: [2 × 1] (i) Carrying capacity
(ii) Homologous chromosomes

(e) Give a reason for each of the following: [2 × 1] (i) Bagging is essential in artificial hybridisation.
(ii) Climax stage is achieved quickly in secondary succession as compared to primary succession.



(i) Immunoglobulin E
(ii) Genetic engineering approval committee’s function is to examine the validity of GM research and to inspect safety in use of GMO’s for the public.
(iii) The offsprings which are produced are genetically and morphologically identical are called clones.
(iv) Scavengers
(v) European Federation of Biotechnology
(vi) 8
(vii) Dryopithecus
(viii) Cryopreservation


(i) 24 weeks
(ii) Tt × tt
(iii) Reduction of ozone-depleting substances
(iv) Autosomal recessive


(i) Divided the Earth into Biogeographical regions
(ii) Father of Indian Ecology
(iii) Triplet nature of codon
(iv) DNA sequencing



(i) Habitats are species specific and have resources upto a limit that can support maximum number of individuals to grow and reproduce beyond which no further growth is possible.
(ii) Homologous chromosomes are chromosome pairs that are similar in length, gene position and centromere location.


(i) So that no foreign pollen may fall on the stigma.
(ii) Because some seeds and underground parts of plants are already present


Section-A (14 Marks), Previous Year Question Paper ISC Biology 2019 Class-12

(Answer: all questions)

Question 2.

Enumerate any four essential features of good and effective poultry farm management practices. [2] Answer:
1. Comfortable, well ventilated, dry, clean and properly lighted house.
2. Poultry house should be protected from rats, cats, etc
3. Good drainage system is essential.
4. Birds of different age should be kept separately.

Question 3.

What is a single cell protein? How is it significant for human welfare? [2] Answer:
It is one of the alternative sources of proteins for animal and human nutrition


– Used as protein rich supplement of human diet.
– Reduces pressure on agriculture.
– Reduces environmental pollution.

Question 4.

(a) List four reasons for drug addiction. [2] Or
(b) List four effects of alcoholism on human health.

1. Curiosity, temporary escape and mental relaxation.
2. Inability to adjust to stresses, strains and anxiety.
3. Differences are shown by members of family and drudgery.
4. Drugs alter perception, behaviour & consciousness.



1. Loss of judgement will power and self-confidence.
2. Amnesia
3. Fatty liver syndrome. In advance, stage causes liver cirrhosis.
4. Effects heart, kidney and stomach.

Question 5.

State four features of flowers pollinated by insects.

Flowers large and brightly coloured.

Pollen grains covered with pollen kit, rough and sticky.

Sepals and petals well developed.

Nectar gland present.

Question 6.

What is reproductive fitness? Explain it with the help of an example. [2] Answer:
Those who are better fit in the environment leave more progeny than others. This is called reproductive fitness.

Oyster lays 60-80 million eggs in a single spawn. If all the eggs hatch and young ones survive, it will be a very huge number of oysters which will be formed on the earth. All of them do not survive only those who are fit in the environment can survive rest die.

Question 7.

Give one significant difference between primary lymphoid organs and secondary lymphoid organs. Give one example of each. [2] Answer:
Primary lymphoid organs – In these organs, immature lymphocytes differentiate into antigen- sensitive lymphocytes e.g., Bone marrow, Thymus Secondary lymphoid organs – The matured lymphocytes undergo proliferation and differentiation e.g., lymph nodes, spleen, tonsils.

Question 8.

(a) Explain the term biofortification. How is this technique useful for the production of ‘ golden rice? [2] Or
(b) Write a short note on Electrophoresis.
(a) Breeding of crops with higher levels of vitamins and minerals or higher proteins and healthier fats is called biofortification.
Golden rice has five times more iron than common varieties.
(b) It is a technique commonly used in the lab to separate charged molecules like DNA, according to size.

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