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ICSE Board's 2013 solved sample (Specimen) Biology Paper
In this resource, I am providing solutions to all questions of 2013 ICSE Board's sample question paper. This resource will help the students how to answer various type questions in the Board's examination. Learning the technique of answering the questions in a proper way will help them to score very good marks.
In this article I am providing solutions to all the questions i.e. both objective type and long answer type questions for the benefit of ICSE students. Students can get 2013 Board's sample Biology pdf. form question paper from here: pdf.ICSE Board's 2013 Biology sample paper
Section-I (40 Marks)
(a) Name the following: (Write the answer only and there is no need to write the question. Write only one correct answer and if you write two different answers(one correct and one wrong) you will loose your mark for the question).
3. Grana or Thylakoids
4. Euro III (country); Euro IV for (Metros)
5. Corpous luteum
(b) State whether the following statements are True or False. If False write the correct form of the statement by changing the first only. (Note: You have to write full word True or False for each statement. If you write T or F for the statement you may not be given marks. For false statement, you have to write the entire statement by replacing wrong word with correct word as suggested in the question paper and also underline the replaced word. For suggesting False for the statement, you don't get any marks.)
Corrected statement: Rods are photoreceptor cells that are sensitive to dim light.
Corrected statement: Vasectomy is the surgical method of sterilization in man.
Corrected statement: Neurons are the basic units of brain.
(c) Give technical terms for the following: (You have to write the spellings of technical terms correctly otherwise there is a scope of loosing marks)
(ii) Endosmosis (There may be a small mistake in the given question. The question may be 'from hypotonic to hypertonic solution')
(d) Given below are five sets with four terms each. In each set one term is odd. Choose the odd one out of the following terms given and name the category to which the other belong:
(i) Odd one: Typing; Category: Simple reflexes
(ii) Odd one: NADPH; Category: NADPH is compound formed in light reaction of photosynthesis while the others are hormones.
(iii)Odd one: X- rays; Category: X-rays are radiation pollution while others are related to water pollution.
(iv) Odd one: Quantasome; Category: Quantasome a functional unit of photosynthesis while the others are the parts of a chloroplast.
(v) Odd one: Lymphocyte; Category: Lymphocyte is non-granular WBC while others are granular type of WBC.
(e) Given below is an apparatus used to study a particular process in plants. Study the same and answer the questions that follow:
(i) Ganong's Potometer
(ii) Twig used in this experiment may not be alive for long duration or Introducing air bubble at the zero reading of horizontal graduated capillary tube.
(iv) By releasing water from the reservoir, the air bubble can be brought back to its original position.
(v) Movement of air bubble in the graduated horizontal bar indicates the amount of water lost by transpiration.
(f) Choose the correct alternative from the choices given below each statement so as to complete its meaning:
(i) (c) 4 Haploid cells
(ii) (c) Ureter
(iii) (b) in the mid of menstrual cycle
(iv) (d) All the above
(g) Given below are five sets of terms. In each case, arrange and rewrite each set in logical sequence:
(i) Tympanum, malleus, incus, stapes, fenestra ovalis
(ii) Graffian follicle, ovum, oviducal funnel, fallopian tube, uterus
(iii) Soil, water, root hair, cortex, xylem, endodermis
(iv) Receptor, sensory neuron, association neuron,motor neuron, effector
(v) Conjunctiva, cornea, pupil, lens, yellow spot
(h) Explain the following terms:
(i) Antiseptic: Chemical substance which are mild in concentration and can applied on the body to check the growth of disease causing germs.
(ii) Photolysis: The breaking down of water molecules into H+ and OH- ions by using light energy in the grana of chloroplast is known as photolysis.
(iii) Growth rate of population: The difference between birth rate and death rate is known as population growth rate.
(iv) Pollutant: Any substance which cause pollution is known as the pollutant.
(v) Tropic hormones: Hormones which stimulate the secretion of other endocrine glands are known as tropic hormones.
Section II (40 Marks)
(i) 1. Pulmonary artery; 2. Pulmonary vein; 3. Renal artery; 4. Hepatic artery.
(ii) 5. Hepatic vein
(iii) Refer text book for diagram.
(iv) Blood vessel 3 represents Artery and blood vessel 8 represents Vein.
Blood vessel 3: Thick muscular walls, narrow lumen, valves absent.
Blood vessel 8: thin muscular walls, wide lumen, valves present.
(b) Differentiate between the following pairs on the basis of what is given in the brackets:
(i) Lymphocytes and Neutrophils ( structure of the nucleus)
Lymphocytes: Single large nucleus
Neutrophils: Nucleus 3-4 lobed
(ii) Beginning of the ventricular systole and the end of ventricular systole
Beginning of ventricular systole: LUBB
End of the ventricular systole: DUP
(iii) Prostrate gland and Cowper's gland (nature of secretion
Prostrate gland: Alkaline secretion which helps to neutralize the acidic condition female genital tract
Cowper's gland: Alkaline secretion which serves as a lubricant
(iv) Rod cells and Cone cells (pigments)
Rod cells: Rhodopsin pigment
Cone cells: Iodopsin pigment
(v) Simple Goiter and exophthalmic goiter (cause of the disorder)
Simple goiter: Due to under or hypo secretion of thyroxine hormone by thyroid gland.
Exophthalmic Goiter: Due to hyper or over secretion of thyroxine hormone by thyroid gland.
(a) Complete the following table by filling in the numbered blanks with appropriate terms/answer:
1. Thyroxine; 2. Regulates basal metabolism; 3. Adrenal; 4. Adrenalin
5. Pancreas (Beta cells); 6. lowers the glucose level in the blood
7. Posterior lobe of Pituitary; 8. increases the re-absorption of
water by kidney tubules; 9. Pancreas (Alpha cells); 10. Glucagon.
(b) (i) For Malphigian corpuscle diagram refer text book.
(ii) Ultra filtration: The filtration of blood at high hydrostatic pressure from the glomerulus into Bowman's capsule is known as ultra filtration. Hydrostatic pressure is caused due to the wide afferent arteriole which enters into the kidney brings more blood than the amount of blood leaves through the efferent arteriole from the kidney. Due to ultra filtration the fluid part of the blood (glomerular filtrate) is filtered into Bowman's capsule.
(a) (i) 1. Placenta: Diffusion of oxygen and nutrients from mother's blood to foetus; Diffusion of CO2 and metabolic wastes from foetus to mother's blood.
2. Chorion: Chorion develop villi which enter into uterine tissue to absorb nutrients from it.
(ii) Functions of amniotic fluid:
1. Amniotic fluids protects the embryo from sudden shocks and jerks.
2. It prevents the sticking of foetus to amnion.
(iii) It is a membranous duct which connects the foetus with placenta. It provide a way for the passage of artery and vein from foetus to placenta as well as from placenta to foetus.
(b) (i) Mendel's law of Independent assortment: When two pairs of contrasting features are taken into consideration, the distribution of one pair in to their gametes is independent of distribution of the other pair.
(ii) 1. Genotype: Tt Rr
Phenotype: Tall red
2. Possible combination of gametes: TR, Tr, tR, Tr
3. Dihybrid ratio: 9:3:3:1
Phenotypes of F2 generation:
9- Tall red
3- Tall white
(a) (i) Myopia
(ii) Possible reasons for Myopia defect:
1. The eyeball become lengthened from front to back.
2. The lens become too curved.
(iii) 1. Vitreous chamber; 2. Yellow spor or fovea centralis; 3. Lens
(iv) Refer the text book for diagram
(b) (i) Reasons for the increase of population in India:
1. Fall in death rate due to better medical care
2. Increase in average life span from 30 years to 50 years
3. Desire for a male child in most of the Indian families
4. Because of illiteracy most of the people in India have no proper knowledge about the problem of population explosion.
(ii) Write the full form of
NADP: Nicotinamide Adenine Dinucleotide Phosphate
BCG: Bacillus of Calmette and Guerin
(III) Antibiotic: Antibiotics are chemical substances extracted from microorganism which can kill or check the growth of disease causing germs. Example: Pencillin; Streptomycin
(iv) Functions of WHO:
1. To promote and support projects for research on diseases.
2. To suggest quarantine measures to prevent the spread of diseases.
3. To lay pharmaceutical standards for life saving drugs.
4. To organize campaigns for the control of epidemic and endemic diseases.
(a) (i) Plasmolysis: The contraction or shrinkage of cell content from cell wall when a plant cell is kept in a hyper tonic solution.
Examples: Salting of pickles; Excess sugar added to jams and jellies; salting of meat.
(b) Steps to follow to conduct Starch test or Iodine Test:
1. Pluck the leaf on which the experiment is conducted and keep the leaf in boiling water for few seconds. This makes the cells of the leaf will be killed and the enzymes in it stop functioning.
2. Keep the boiled leaf in a test tube containing methyl alcohol and keep in boiling water for few minutes. It makes chlorophyll of the leaf to dissolve in methyl alcohol. Due to this the leaf turns pale green in color.
3. The leaf is then washed in luke warm water to make it soft.
4. The soft leaf is spread over a porcelain tile and iodine drops were kept at different places of the leaf. If starch is present, iodine drops will turn into blue black color and if starch is absent, iodine drops will turn into brown color.
(iii) Adaptations to reduce transpiration:
1. Leaves become narrow
2. Thick waxy cuticle on the leaf
3. Number of stomata gets very much reduced
4. Sunken stomata
5. Leaves are modified into thorns or dropped.
(b) For the diagram of structure of inner ear refer text book.
Parts responsible for static balance Utriculus and Sacculus
(ii) Ustachian tube
(iii) Microbial diseases and vaccine used:
1. typhoid- TAB vaccine
2. Tuberculosis- BCG vaccine
(a) (i) Anaphase stage.
The chromatids of each chromosome are moving towards the opposite poles of the cell.
(ii) 1. Centrioles; 2. Spindle fibres; 3. Chromatid
(iii) Four chromosomes
(iv) The next stage is Telophase.
For diagram refer text book.
(b) (i) Excess fertilizers added to the soil will increase the concentration of soil solution around the roots. Due to this water from root hairs leaves into the surrounding hypertonic solution through exosmosis. The root hairs become dehydrated and thereby the plant will die.
(ii) Medulla oblongata controls the activities like heart beat and breathing. Injury to medulla oblongata leads to stoppage of heart beat and breathing which leads to the death of the person.
(iii) Gametes are formed from diploid sex cells through meiosis. Meiosis helps to reduce the chromosomal number to half in gametes. But when gametes fuse through fertilization the original number of chromosomes will be restored in an individual.
(iv) Broadness of the leaves will help the leaf to get more energy from sunlight to increase the rate of photosynthesis. Thinness of the leaves will help in easy transport of CO2 and water to the leaf. The penetration of sunlight become easier if the leaf is thin.
(v) In an old cell, lysosomes burst themselves to release enzymes to destroy the worn out parts of the cell. Due to this lysosomes are known as the suicidal bags of the cell.
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