ISC Biology 2016 Class-12 Previous Year Question Papers

ISC Biology 2016 Class-12 Previous Year Question Paper Solved for practice. Step by step Solutions with Part-I, and II (Section-A,B). By the practice of ISC Biology 2016 Class-12 Solved Previous Year Question Paper you can get the idea of solving.

Try Also other year except ISC Biology 2016 Class-12 Solved Question Paper of Previous Year for more practice. Because only ISC Biology 2016 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 2016 Class-12 Previous Year Question Papers Solved


-: Select Your Topics :-

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Part-I,

Sections-A, Part- II,

Sections-B, Part- II,


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.)

  • Answer all questions in Part I and six questions in Part II, choosing two questions from each of the three sections A, B and C.
  • All working including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer.
  • The intended marks for questions or parts of questions are given in brackets [ ].

Part-I (20 Marks)

ISC Biology 2016 Class-12 Previous Year Question Papers Solved

Question 1.
(a) Give a brief answer for each of the following : [4]
(i) What is central dogma?
(ii) Define cryopreservation.
(iii) What is symbiosis?
(iv) Explain the term perianth.

(b) Each of the following question(s) / statement(s) has four suggested answers. Choose the correct option in each case. [4] 1. The curve showing the amount of light absorbed at each wavelength is :
(i) Action spectrum
(ii) Absoiption spectrum
(iii) Quantum yield
(iv) Quantum requirement

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2. After fertilisation, the integuments of an ovule develop into :

(i) Seed
(ii) Seed coat
(iii) Fruit
(iv) Fruit wall

3. Meselson and Stahl’s experiment proved:
(i) Transduction
(ii) Transformation
(iii) DNA is the genetic material
(iv) Disruptive DNA replication

4. The act of expelling the full-term foetus from the uterus is termed as :

(i) Gestation
(ii) Implantation
(iii) Parturition
(iv) Capacitation

(c) Give scientific terms for each of the following: [4]
(i) The smallest unit of DNA which can mutate.
(ii) Type of water absorption by roots where metabolic energy is required.
(iii) Statistical study of human population.
(iv) Multiple effects of a gene on the phenotype of an organism.

(d) Expand the following abbreviations : [4]

(i) rDT
(ii) BAC
(iii) SSBP
(iv) IUCD

(e) Name the scientists who have contributed to the following : [4]
(i) Reverse transcription
(ii) Photorespiration
(iii) Principle of limiting factors
(iv) Photolysis of water
Answer:
(a)

(i) The basic belief held by molecular geneticists that the flow of genetic information is unidirectional and occurs from DNA → RNA → Protein.
(ii) Cryopreservation is a technique in which organisms, tissue and cells are preserved and stored at very low temperature of liquid nitrogen (-196°C) for years. They remain viable in frozen state for future use.
(iii) Symbiosis is a beneficial association between members of different species in which both the partners are benefitted.
(iv) Perianth is the term used when the calyx and corolla of the flower are indistinct.

(b)
1. – (ii) Absorption spectrum

2. – (ii) Seed coat
3. – (iii) DNA is the genetic material
4. – (iii) Parturitio

(c)

(i) Muton

(ii) Active absorption
(iii) Demography
(iv) Pleiotropy

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(d)

(i) recombinant DNA Technology
(ii) Bacterial Artificial Chromosome
(iii) Single-Strand Binding Protein
(iv) Intra-Uterine Contraceptive Device

(e)

(i) Temin and Baltimore
(ii) Dicker and Tio
(iii) Blackman
(iv) Robin Hill


Sections-A, Part- II,
(Answer any two questions)

ISC Biology 2016 Class-12 Previous Year Question Papers Solved

Question 2.
(a) Mention three features of the Neanderthal Man. [3] (b) Differentiate between connecting link and missing link. [1] (c) What is adaptive radiation? [1] Answer:
(a)

(i) Brain size 1300-1600 cc.
(ii) Used hides to protect the body
(iii) Buried their dead
(iv) Knew use of fire, lived in caves
(v) Omnivore.

(b) Connecting links are living intermediate forms which possess characters of two groups. Missing links are the transitional or intermediate forms between two groups of organisms which occur only in the fossil state.

(c) Adaptive radiation is the formation of a number of divergent species from a common ancestor with new species adapting to different ecological niches.

Question 3.
(a) Give an account of Lederberg’s replica plating experiment to show the genetic basis of evolution. [3] (b) Define phylogeny. [1] (c) What is Founder s effect? [1] Answer:
(a) Lederberg’s Replica Plating Experiment: Joshua Lederberg and Esther Lederberg, gave an experimental demonstration of genetic basis of adaptation. They performed an experiment on bacteria to demonstrate the genetic basis of a particular adaptation. They obtained a ‘master plate’ of bacterial culture by inoculating a dilute suspension of bacteria on an agar plate. After a certain period, the master plate was found to contain several bacterial colonies. Each colony represented a clone that has originated from a single bacterial cell as a result of repeated divisions. They prepared many replicas of the master plate on new agar plates. After that, they tried to grow bacteria on replica plates with an antibiotic (e.g., penicillin). Most colonies of the master plate failed to grow on replica plates having antibiotic. Only few colonies that could be formed were found to be resistant to penicillin. It means that certain bacteria have acquired an ability to survive and grow in a new environment. This mutant strain of bacteria has adapted.

According to Darwinism, the original suspension of bacterial cells contained few mutant bacteria which had mutant genes that enabled them to survive the effect of penicillin and form colonies.
ISC Class 12 Biology Previous Year Question Papers Solved 2016 1

(Sensitive colony) (Resistant colony)

Fig. Lederberg’s replica plating experiment

The Lederberg’s replica plating experiment provided a support to Darwinism is that the adaptation in bacterial cells arose due to selection of pre-existing mutant forms of bacteria. It is based on the fact that the pattern of colonies seen in all the replica plates was same.

(b) Phylogeny deals with the study of evolutionary history of an individual/group of organisms.

(c) From the original drifted population, some organisms are selected and colonise in the new habitat, (founders), produce different alleles (due to mutations) resulting rapid changes in the phenotypes forming new species, is called founder effect.

Question 4.   ISC Biology 2016 Class-12 Previous Year Question Papers Solved

(a) With reference to the levels of organisation, differentiate between living organisms and non-living objects. [3] (b) Mention one cause for variation in nature. [1] (c) What is the difference between the teeth of apes and the teeth of man? [1] Answer:
(a) Organisation is a systematic arrangement of smaller and simpler components into larger one in a hierarchy or pyramid of levels where each level is formed of components of lower level and itself becomes part of higher-level for achieving a common goal.

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