ISC Biology 2010 Class-12 Previous Year Question Papers
ISC Biology 2010 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 2010 Class-12 Solved Previous Year Question Paper you can get the idea of solving.
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ISC Biology 2010 Class-12 Previous Year Question Papers Solved
-: Select Your Topics :-
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.
- Part I contains one question of 20 marks having four sub parts.
- Part II consists of Sections A and B.
- Section A contains seven questions of two marks each Section B contains seven questions of three marks each, and
- Section C contains 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 [ ].
(Attempt All Questions)
ISC Biology 2010 Class-12 Previous Year Question Papers Solved
(a) Give one significant difference between each of the following : 
(i) Aggregate fruit and Multiple fruits.
(ii) Amphicribal vascular bundle and Amphivasal vascular handle
(iii) Open vascular system and Closed vascular system.
(iv) Uricotelism and Ammonotelism.
(v) Auxetic growth and Accretionary growth.
(b) Give reasons for the following: 
(i) Most people living in hilly regions suffer from goitre.
(ii) The water potential of pure water changes when solute is added to it.
(iii) When we turn round and round, we lose our balance.
(iv) The spores of Bacillus thuringiensis are used as bioinsecticide.
(v) Owls have better night vision than day vision.
(c) Give scientific terms for each of the following: 
(i) Adjustment of the eye in order to obtain a clear vision of objects at different distances.
(ii) A device to measure growth in length of a plant.
(iii) The formation of blood cells in the bone marrow.
(iv) The response of an organism to relative length of day and night.
(v) Surgical removal of a section of vas deferens.
(vi) The act of passing out of urine.
(d) Mention the most significant role of each of the following : 
(i) Schwann cells
(ii) Organ of Corti
(iv) Sertoli cells
(vi) Gustatory cells
(e) State the best-known contribution of 
(ii) John Otto
(iv) T.R. Malthus
(f) Expand the following: 
Answer: (ISC Biology 2010 Class-12 Previous Year Question)
|Aggregate fruit||Multiple fruits|
|It is a group of fruit lets which develop from the free ovaries of a single flower.||It is a group of fruit lets which is formed from a whole inflorescence including peduncle.|
|Amphicribal vascular bundle||Amphivasal vascular handle|
|It consists of a central core of xylem, surrounded completely by phloem on all sides.||It consists of a central core of phloem, surrounded completely by xylem on all sides.|
|Open vascular system||Closed vascular system|
|It contains a strip of cambium in between xylem and phloem.||It lacks cambium between xylem and phloem.|
|It is the elimination of uric acid as the main nitrogenous waste material.||It is the elimination of nitrogen waste mainly as ammonia.|
|Auxetic growth||Accretionary growth|
|In this the body grows in dimension merely by the enlargement of its cells without any increase in the number of cells.||There is production of new cells to replace the worn-out differentiated cells, by mitotic division of special undifferentiated reserve cells, present along with differentiated cells.|
(i) It is caused by the deficiency of iodine in the diet, needed for synthesis of thyroid hormones. It causes enlargement of the thyroid gland.
(ii) The water potential of pure water is highest, considered as zero at normal temperature and pressure. All the water molecules are free and have maximum kinetic energy. Addition of solute decrease the kinetic energy of the water molecules (due to collision of solute and solvent molecules), thus lowering the water potential of water in the solution.
(iii) When we turn round and round, the endolymph in the semicircular ducts, does not move as fast as our body and the sensory cells of cristae continue to move, after the body stops moving. Because of this difference in the rate of movement, the sensory hair of cristae are swept through the endolymph and become bent over, to stimulate sensory cells, which set up action potential in the fibres of auditory nerve, which transmit it to brain.
The brain sends, instructions to muscles to act, hence we lose our balance.
If you turn round and round in circles, the endolymph in semicircular canal is forced to one end. When you stop moving, the endolymph rushes back, the other way. This give you the whirling sensation in the opposite direction and you feel giddy and find difficult to overcome the tendency of falling down. Thus we lose our balance.
(iv) The spores of Bacillus thuringiensis are used as bio-insecticides because they contain proteinaceous toxins- thurioside as crystals to eradicate different group of insects such as moths, flies, mosquitoes, beetles etc. ingesting the spores. These toxins are converted in to active form and kill the insects by inhibiting the ion transport chain in the midgut.
(v) Owls have better night vision than day vision because they mainly contain rod cells in
their retina. These cells possess a visual purple pigment called Rhodopsian which works in dim or diffused light. In bright light, it is broken and does not work.
(i) Power of accommodation
(i) Schwann Cells form neurilemma outside myelin sheath of medullated nerve fibre. They help in saltatory conduction of impulses.
(ii) Organs of corti help in hearing by transmitting the sound impulses to the brain through the auditory nerve. In brain, the sensation of hearing is felt.
(iii) Phellogen is the cork cambium. Its cells have bipolar activity. It cuts of compactly arranged cork cells (phellem) towards outside and loose, radially arranged secondary cortex cells (phelloderm) towards inner side. Later, the cork cells become dead, lose their protoplasm. The three together are called Periderm.
(iv) Sertoli cells are present, along the wall of seminiferous tubule and play a role in nourishing the developing sperms. ,
(v) Neutrophils are the most numerous of all leucocytes, having many lobed nucleus, fine granules and phagocytic in nature.
(vi) Gustatory cells are the taste cells, large in number, present inside each taste bud. They contain taste hairs, sensitive to particular chemicals only when they are dissolved in solutions that enter taste pores.
(i) Nawaschin discovered double fertilisation in plants.
(ii) John Otto discovered Haemophilia.
(iii) Went coined the term auxin for growth-promoting substance.
(iv) T.R. Malthus an economist published essay on ‘Human Population Growth’ in 1799. Both Darwin and Wallace were inspired by his writings and conceived the idea of natural selection.
(i) ECG: Electro Cardiography.
(ii) AIDS : Acquired Immuno Deficiency Syndrome.
(iii) NAA: Naphthalene Acetic Acid.
(iv) ACTH : Adreno Cortico Trophic Hormone.