ICSE Question Paper (2005)

BIOLOGY
SECTION-I (40 Marks)
(Compulsory : Answer all parts from this section.)
Question 1.
(a) Name the following :
(i) The organ that produces urea:
(ii) The organization that suggests quarantine measures to prevent the
spread of disease.
(iii) The tissue lining the inner part of the cheek of man.**
(iv} Mutually beneficial association of two living organisms.**
(v) The phase of the cardiac cycle in which the ventricles relax. (5]
(b) Choose the odd one out from each of the following sets, giving the reason for
your choice
(i) AIDS, Small pox, Diphtheria, Measles.
(ii) Mitral valve, Sino atrial node, Aorta, Pulmonary vein.
(iii) Fat droplet, Glycogen, Cell membrane, Starch.**
(iv) Carbolic acid; Mercurochrome, Phenol, Benzoic acid.
(v) Basophils, Neutrophils, Monocytes, Eosinophils. [5]
(c) Complete the following table by filling in the blank spaces numbered 1 to 10 :
Gland _ _ __ - Secretions Effect on body
-
1 -- -
-.

Oestrogen 2
Alpha cells of pancreas 3 4
5 6 Protruding eyes
Lachrymal 7 8
9 10 Gigantism.
(5]
(d) State whether the following statements are TRUE or FALSE. If false, rewrite
the correct statement by changing the first or last word only :
(i) Horrrwnes are secreted directly into the organs.
(ii) Photosynthesis occurs in all the cells of a plant.
(iii) · Antibodies are obtained from fungi and bacteria.
(iv) Vasectomy is the surgical method of sterilization in men. (5)
(e) Give the exact location and one function of each of the following structures :
(i) Meninges {ii) Lenticels (iii) Chordae tendinae
(iv) Amnion (v) Thylakoids. (5)
(f) · Given below in the box are a set of 14 biologi.cal terms. Of these, 12 can be
paired into 6 matching pairs. Of the six pairs, one has been done for you as an
example. Write out the remaining 5 matching pairs made by you as '1 to 5'.
** Answer has not given due to out ofpresent syllabus.
 Vein, Kidney, Artery, Androgen, Water Pollutants, Myopia, Leydig cells, .
Thoracic cavity**, Narrow lumen, Lungs**, Uriniferous tubule, Pleural
cavity**, Insecticides, Concave lens.

[ S]
Example : Myopia-Concave lens.

(g) Study the diagram given alongside and

answer the questions that follow
(i) Explain the physiological process
being studied.
(ii) What will be observed in the two test
tubes after two to three days ?
(iii) Give a reason for your answer in (ii)
above.
(iv) Why is the surface of water covered
with oil?
(v) State the purpose of setting up test-
tube B. [5]
(b) Given below are five sets of terms. In each
case, arrange re-write each set of terms so A a
as to be in logical sequence:
(i) Right auricle, Pulmonary vein, Post and Pre Vena Cava, Lungs, Right
ventricle, Pulmonary artery, Left auricle.
(ii) Posterior Vena Cava, Renal artery, Aorta, Renal vein, Kidney.
(iii) Dorsal root ganglion, Receptor, Effector, Ventral root ganglion,
Associated neuron.
(iv) Graafian follicle, Ostium, Ovum, Uterus, Fallopian tube.
(v) Yellow spot, Conjunctiva, Pupil, Cornea, Lens, Vitreous humour,
Aqueous humour. [5]
Answer:
(a) (i) Liver (ii) WHO (iii) Ventricular diastole
(b) Odd one Reason
(i) Diptheria others are Viral diseases.
(ii) Sinoatrial node others are at left side of heart.
(iv) Phenol others are antiseptic.
(v) Monocytes others are granular leucocytes
(c) Gland Secretions Effect on body
1. ovary Oestrogen 2. production of egg
Alpha cells of pancreas 3. glucagone 4. increase blood
sugar level
5. Thyroid 6. Thyroxin Protruding eyes
Lachrymal 7. Tears 8. Washesust parti�
cles and kills
germs
9Pituitary 10. Growth hormone Gigantism.

** Answer has not given due to out ofpresent syllabus.

 False. Enzymes are secreted directly.into the organs or Hormones are
(d) (i) .
secreted directly into the blood.
' ' (ii False. Respiration occurs in all the cells of plant.
)
(iii) False. Antibiotics are produced from fungi and bacteria.
(iv) . True
(e) (i) Meninges:
Location Covers brain and spinal cord.
Function Protection to the brain and spinal cord.
(ii) Lenticels:
Location on older stems.
Function exchange of gases.
(iii) Chordae tendinae :
Location On the inner surface of the ventricles.
Function Prevent valves to be pushed into auricles.
(iv) Amnion :
Location around the embryo.
Function protects the developing embryo.
(v) y
Th lakoids :
Location Inside chloroplast.
Function To trap solar energy.
(f) (i) Androgen Leydig cells.
(ii) Artery Narrow Lumen
(iii)· Kidne y Uriniferous tubule
· (iv) Water Pollutants - Insecticides.
(g) (i) The physiological process__being studied is transpirations. To show the
.. - r absorbed by the plant root due to trans
loss ofwat � piration.
. ,
(ii) The observation after about 2-3 days will be that the level of water in
test tube A has gone down to a greater extent, but in test tube B the
level of water remains the same.
(iii) The water in test-tube A was absorbed by roots and through xylem
vessels it has reached the leaves. The transpiration is responsible to lose
water through the leaves.
Therefore, the level of water in test-tube A falls down. In test-tube B,
there is no plant fixed on it. Therefore, transpiration has not taken
place. Therefore, the level of water remains the same.
(iv) Oil has been put in each test-tube to prevent the loss of water due to
evaporation.
(v) Test-tube Bis set up as control the experiment and show that water is
absorbed by roots and transpired by a plant in the test-tube A.
(h) (i) Post and Pre vena cava ➔ Right auricle ➔ Right ventricle ➔ pulmonary
artery ➔ Lungs_ ➔ Pulmonary veins ➔ �ft auricle.
(ii) Aorta ➔ Renal artery ➔ Kidney ➔ Renal vein ➔ Posterior vena cava.
(iii) . Receptor, Dorsal root ganglion, Associated neuron, Ventral root
ganglion, Effector.
·(iv) Ostium, Graafian, follicle, Ovum., Fallopian tube, Uterus. ;<

(v) Conjunctiva, Cornea, Aqueous humour, Pupil, Lens,Vitre�ms.humour.

 SECTION II (40 Marks)
(Attempt any four questions from this section.)
Question 2.
(a) Given alongside is the diagram of a cell.
Study the same and answer the
questions that follow :
4
(i) Name the parts 1, 2, 3 and 4
indicated by the guidelines.
2
', (ii) State the functions ofparts 2 and 4. 5 ---41;!---'--+,:��
(iii) Draw a labelled diagram of the
organelle '5' as seen under the
electron microscope. [5]
(b) (i) Explain the term. Plasmolysis. Give
one application of this phenomenon
in our daily lives.
(ii) Enumerate the steps involved in testing a green leaf for the presence of
starch.
(iii) What is Ganong's Potometer used for ? Write any two limitations of thi.s
apparatus. [5]
Answer:
(a) (i) (1) Centrosome (2) Golgi apparatus
(3) Chromatin fibers (4) Nucleolus
(ii) (1) Golgi apparatus : Synthesis and secretion of enzymes and
hormones.
(2) Nucleolus : Participates in protein synthesis by forming and
storing RNA.
(iii)

Outer
Inner Membrane
Mitochondrial Membrane
Matrix
(b) (i) Plasmolysis-If the cell is kept in a hypertonic solution, it will lose its
distended appearance, the cytoplasm will shrink and the plasma
membrane will withdraw from the cell wall. This shrinkage from cell
wall is called plasmolysis.
Vegetables can be preserved during pickling by adding salt.
(ii) Steps for starch test :
(a) Dip the leaf in boiling water for a minute to kill the cells.
(b) Boil the leaf in methylated spirit over a water bath till it becomes
pale white due to the removal of chlorophyll.
(c) Place it again in hot water to soften it.
(d) Spread the leaf in a dish and pour iodine solution on it. Presence of
starch will be indicated by the blue black colour. A leaf without
starch will show brown colouration.
 (iii) Ganong's Potometer is used to measure the rate of transpiration.
Limitations: (a) Introducting the air bubble is not very easy. (b) The
twig may not remain fully alive for a long time.
QUestion 3.
Given below is the diagrammatic representation of the transverse section of a
(a)
part of a plant. Study the same and
answer the questions that follow

6 5 4 2
3
(i) Name the part of the plant that is shown.
(ii) Label the parts 1 to 6, indicated in the diacram.
(iii) Write the functions ofparts 3 and 5. [5]
(b) (i)
.
Fill in the blanks to complete the chemical equaticms. Name the process
· in each case
** :
(1) ............... + 602 ➔ ............... + 38A.T.P.
(2) ............... ➔ ......... + ....-..... + 2 A. T.P.
(ii) • State the difference between Anaerobic respiration in plants and in man.
[5]
Answer:
(a) (i) Internal shucture of a root.
(ii) 1. Root hair, 2. Epiblema, 3. :cortex (parenchymaJ, 4. Endodermis, 5.
Phloem, 6. Xylem.
(iii) 'Part 3 (cortex}-The cells of the cortex store food and also conduct water
from epiblema to the inner tissues.
Part 5 (Phloem)-Phloem transports organic food inside t'lte body of the
plant ..
Ques�ion4.
(a) Study the figures A, B and C shown below and answer the questions that
follow: [5]

**
Answer has not given due to out ofpresent syllabus.
 (i) Name the blood vessel shown in A.
(ii) Name the two blood cells in A. Give one structural difference between the
two blood cells.
(iii) Name the processes taking place in 'A' and in 'B'. State the importance of
each process.
(b) (i) What is meant by power of accommodation of the eye ? Name the musc'k8
of the eye responsible for the same.
(ii) Draw a labelled diagram of the inner ear. Name the part of the inner ear i
that is responsible for static balance in human beings. (51
Answer:
_(a) (i) Capillaries.
(ii) RBC and WBC. One structural difference between RBC and WBC ia
RBC are biconcave in shape and WBC are amoeboid in shape.
(iii) A-Diapedesis
B-Phagocytosis.
Importance :
Diapedesis-WBC squeeze of the walls of capillaries.
Phagocytosis-WBC engulf bacteria.
(b) (i) Power of accomodation of eye-By changing the curvature of the
elastic lens the image of objects of different distance is sharp focussed.
Ciliary muscles are responsible for accomodation of eye.
(ii)

} Semi-circular
canals

.,.i.,.�IF,ir-- } Vestibular apparatus

Parts responsible for static balance is utricules and sacculus.

Question 5.
(a) (i) Draw a labelled diagram of the longitudinal section of the kidney.
(ii) Briefiy describe the formation of Glomerular filtrate.
(iii) Explain the term Osmoregulation. [5]
(b) Give one point of difference between the following pairs on the basis of what is
indicated in brackets :
(i) Ribosome and Mitochondria (function).
(ii) . · Medulla oblongata and Cerebellum (function).
(iii) Implantation and Gestation (definition).
(iv) Open and closed Vascular bundle (structure).
(v) Isobilateral leaf and Dorsiventral leaf (type of venation).** [5]
** Answer has not given due to out of present syllabus.
.AnsWer:
(a) (i) Labelled Diagram :
Medulla
�a.---- Cortex

Pelvis

Pyramids
(ii) During ultrafilteration almost all the liquid part of the blood comes out
of the glomerulus and passes into. the funnel-shaped cavity of
Bowmain's capsule. The fluid entering the renal tubule is called
glomerular :literate which contains water, urea, salts, glucose and other
plasma solutes.
(iii) The kidney while removing wastes like urea from the blood also
regulates its compo-sition. The per-centage of water and salts. This
function is called Osmoregulation. It helps in regulation of osmotic
pressure of the blood.
(b) (i) Ribosomes Mitochondria
Protein synthesis To produce and store energy.
-
(ii) Medulla Oblongata Cerebellum
Control the activities of the Maintain the body balance.
internal organs.

(iii) Implantation Gestation

The· attachment of the blastocyst The period of interauterine foetal
to the inner lining of uterus development. The full term
(endometrium). development of embryo in the
uterus is called Gestation.

(iv} Open Vascular Bundle Closed Vascular Bundle

Cambium is present between Cambium is absent between
xylem and phloem. xylem and phloem.
Question 6.
(a) Given figure is a diagrammatic representation of the alveoli and its capillary
network: [5]
(i) Name the parts labelled 1 and 2.
(ii) Which type of blood fiows through the part labelled '1'?
 (iii) Mention any two characteristic
features of the alveoli that enable it to 1 ---"'l�
perform its function of exchange of
.
respiratory gases.
**
(iv) Explain the following respiratory 2
volumes:**
(1) Vital capacity.
(2) Inspiratory Reserve Volume.
(b) (i) Draw a labelled diagram of a
myelinated neuron.
(ii) Explain the difference between a sensory nerve and a motor nerve.
(iii) Differentiate between :
(1) Nitrogen fixation and Nitrification.**
(2) Passiue Immunity and Active Immunity.
•Answer:
(a) (i) 1. Plumonary vein, 2. Pulmonary artery.
(ii) Oxygenated blood.
(b) (i)
Dendrites

Myelin
Node of Sheath Axon
Ranvier

Neurolemma Nucleus
Axon Fibre

(ii)
Sensory Nerve Motor Nerve
(1) It brings the impulse form (1) It brings the impulse from
receptor to brain or spinal brain or spinal cord 'to
cord. effector.
(2) It contains sensory fibres. (2) It contains only motor fibers.
· (iii) (2)
Passive Immunity Active Immunity
1. Produced by one's own body.1. Received from outside, i.e.,
not developed by one's own
·body.
2. Induced by infection or by 2. Provided by readymade anti-
contact with immunogens bodies.
** Answer has not given due to out ofpresent syllabus.