ISC Class XII Biology previous years question papers

Can you please give me the Indian School Certificate Examinations Class XII Biology previous years question papers as it is very urgent for me?

As you want to get the Indian School Certificate Examinations Class XII Biology previous years question papers so here is the information of the same for you:

PART I
Answer all questions
Question 1
(a) Mention one significant difference between each of the following: [5]
(i) Vaccination and Sterilization.
(ii) Renin and Rennin.
(iii) Aeroponics and Hydroponics.
(iv) Yellow Spot and Blind Spot.
(v) Collenchyma and Sclerenchyma
(b) Give reasons for the following: [5]
(i) Nerve impulses on a neuron travel only in one direction.
(ii) Erythrocytes perform anaerobic respiration only.
(iii) Endosperm in Castor seed is triploid.
(iv) Man can live without food for several days but cannot live without oxygen for even a few minutes.
(v) Transpiration is a necessary evil.
(c) Give scientific terms for the following: [3]
(i) Removal of pituitary gland.
(ii) The kind of conduction of nerve impulse along a myelinated nerve fibre.
(iii) Morphological or physiological changes in an organism either due to genetic or environmental reasons.
(iv) Stiffening of muscles after death.
(v) Failure of seed to germinate even in the presence of necessary favourable environmental conditions.
(vi) Surgical removal of part of an oviduct.
(d) Mention the most significant function/role of the following: [3]
(i) Heparin.
(ii) Pons varoli.
(iii) Leydig cells.
(iv) Nostoc.
(v) Leghaemoglobin.
(vi) Mast cells.
(e) State the best-known contribution of the following Scientists: [2]
(i) Julius Sach.
(ii) Robert Hill.
(iii) Ronald Ross.
(iv) Blackman.
(f) Elaborate the following: [2]
(i) NMEP
(ii) BCG
(iii) NMR
(iv) SCID

PART II
SECTION A
Answer any three questions.
Question 2
(a) Describe the Histogen theory. [4]
(b) Describe the development of the male gametophyte in angiosperms. [4]
(c) What are fleshy fruits ? Explain with the help of an example. [2]

Question 3
(a) Discuss the major events in Calvin cycle. [4]
(b) Describe the carbonic acid exchange theory for absorption of mineral salts in plants.[3]
(c) Give the differences between photoperiodism and vernalisation. [3]

Question 4
(a) Draw a neat and fully labelled diagram of the Vertical Section of the human eye. [4]
(b) Describe the ABO system of blood groups. [4]
(c) Give four differences between Sympathetic and Parasympathetic Nervous System.[2]

Question 5
(a) Describe the events that take place during the ovulatory and secretory phase of menstrual cycle. [4]
(b) Explain the cause and symptoms of following:
(i) Uremia.
(ii) Jaundice.
(iii) Gout. [3]
(c) Name the , and cranial nerves and write their functions. [3]

Question 6
(a) Before the proteins can enter the blood stream, they need to be processed. Describe the treatment received by protiens in the alimentary canal. [4]
(b) Explain the stomatal movements based on ion transport mechanism. [4]
(c) Define regeneration. Explain reparative regeneration. [2]

SECTION B
Answer any two questions

Question 7
(a) Give an account of the Oparin – Haldane theory of Origin of life. [4]
(b) How can one justify that Cromagnon man could have been the direct ancestor of man of today? [4]
(c) Write two disadvantages of using pesticides. [2]

Question 8
(a) Write two uses of each of the following:
(i) Azadirchta.
(ii) Cinchona calisaya.
(iii) Ocimum sanctum.
(iv) Withana somnifere. [4]
(b) Explain Integrated Pest Management. [4]
(c) What is ultrasound imaging. Give one use of ultrasound imaging. [2]

Question 9
(a) Write a short note on AIDS, its transmission and control measures. [4]
(b) What are stem cells? Why have stem cells become so important these days? [3]
(c) Explain three causes of mental illness. [3]

Question 10
(a) What are the general activities of community health services? [4]
(b) What are the reasons for drug addiction. [4]
(c) Write one symptom each of -
(i) Down syndrome.
(ii) Filariasis. [2]

PART – 1 (Answer All Question)
Q 1 :
(a) Give one significant difference between each of the following : 5
(i) Absorption spectrum and Action spectrum
(ii) Heart Wood and Sap Wood
(iii) Tranquillizers and Sedatives
(iv) Arteriosclerosis and Atherosclerosis
(v) Myogenic heart and Neurogenic heart
(b) Give the exact location and function of the following : 3
(i) Tectorial membrane
(ii) Leydig’s cells.
(iii) Stroma
(iv) Mast cells
(v) Pacinian corpuscles.
(c) Answer in brief : 2
(i) Why does skin become wrinkled in old age?
(ii) Which part of soil water is available to plants for absorption by roots?
(iii) What makes the apical meristem of the root sub-terminal?
(iv) Name the enzyme which catalyses bicarbonate formation in RBCs.
(v) Which form of phytochrome induces flowering in SDP?
(d) Fill in the blanks : (2+1/2)
(i) The pigment in red muscle fibre is ………
(ii) Amount of blood pumped by heart per minute is called ………
(iii) Ethylene accelerates ……… of leaves, flowers and fruits.
(iv) The biological name of Tulsi plant is ………
(v) ……… is the causative agent of Cholera.
(e) Give the contributions of the following scientists: (2+1/2)
(i) William Roentgen
(ii) Marshall Hall
(iii) Godfrey Houns field
(iv) Munch
(v) Robert Koch
(f) Elaborate the following : (2+1/2)
(i) MRI (ii) IUD (iii) SAN (iv) CNS (v) IPM
Q2: (a) Give the anatomical differences between a dicot leaf and a monocot leaf. 4
(b) Enlist the functions of mineral elements in the life of a plant. What do you mean by essentiality of an element? 4
(c) Write the differences between nastic and tropic responses. 2
Q3. (a) Describe the internal structure of the human heart. 4
(b) Explain the counter system in the nephron. 4
(c) Explain four functions of the liver. 2
Q4. (a) Give the different between cyclic and Non-cyclic photophosphorylation. 4
(b) Write the effect of cytokinins on the plant. 4
(c) Write four advantages of cross pollination over self pollination. 2
Q5. (a) Draw a neat labeled diagram of a transverse section of human ovary. 4
(b) Explain the mechanism of hearing by the human ear. 3
(c) Difference between: 3
(i). Reparative and Restorative regeneration.
(ii). Capacitation and fertilization.
Q6. (a) What is feedback mechanism ? Explain with reference to a hormone secreted from the posterior lobe of the pituitary. 4
(b) Explain briefly the movement of water form the soil across the root to the xylem vessel. 4
(c) Name the second and tenth cranial nerves and write one function of each. 2
Q7: (a) Explain four measures to control population explosion. 4
(b) Write the causative agent and main symptoms of the following diseases: 4
(i) Tuberculosis (ii) Tetanus
(iii) Hepatitis (iv) Malaria
(c) Write two differences between benign tumour and malignant tumour. 2
Q8: (a) Define: 4
(i). Vestigeal organs
(ii). Sympatric speciation
(iii). Mutagens
(iv). Biogeography
(b) Archaeopteryx is considered a connecting link between reptiles and birds. Justify the statement by giving two characteristics of each group. 4
(c) Give two differences between natural selection and artificial selection. 2
Q9: (a) Write /bur characteristics that have developed during human evolution. 4
(b) What are stem cells? Write two applications of stem cell in medical treatment. 3
(c) Mention three basic ways to conserve plant resources. 3
Q10 : (a) Describe the procedure of tissue culture in plants. 4
(b) Explain natural selection on the basis of sickle-cell anaemia. 4
(c) Give one difference between: 2
(i) Intraspecific struggle and Interspecific struggle.
(ii) Somatogenic variation and Blastogenic variation.

You need Indian School Certificate Examinations Class XII Biology exam questin paper, here I am giving;

(a) Mention one significant difference between each of the following: [5]
(i) Open vascular bundle and closed vascular bundle.
(ii) Sertoli cells and spermatids.
(iii) Incomplete dominance and co-dominance.
(iv) Autosomes and sex chromosomes.
(v) Osmosis and diffusion.

(b) Give reasons for the following: [5]
(i) Wooden doors and windows get jammed during monsoon season.
(ii) Some people can move their pinna.
(iii) Seedlings should be transplanted early in the morning or late in the evening.
(iv) The sex of the child depends upon the father.
(v) Mother’s blood does not circulate through the foetus.

(c) Each of the following questions / statements has four suggested answers. Rewrite
the correct answer in each case:
(i) A custard apple fruit is classified as:
(A) Simple and dry.
(B) Simple and fleshy.
(C) Aggregate.
(D) Multiple.

(ii) Which one of the following would not be a limiting factor in photosynthesis?
(A) Oxygen
(B) Carbon dioxide
(C) Chlorophyll
(D) Light

(iii) The base sequence known as the anticodon is a part of a:
(A) Ribosomal RNA.
(B) Transfer RNA
(C) Messenger RNA
(D) D.N.A.

ISC Board Biology paper

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Answered By StudyChaCha Member

this is the question paper of year?

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