ICSE Class 10 Biology Question Paper Solution 2018

Solving ICSE Class 10 Biology previous years question papers helps in understanding the difficulty level of the exam. Students also get to know the important topics from where the questions are mostly asked in the ICSE Class 10 Biology Question Paper 2018. This helps them in planning a proper exam strategy and by following it, students can easily score high marks in the exam. So, they must solve the 2018 question paper and then go through the answers by referring to ICSE Class 10 Biology Question Paper 2018 Solutions.

The ICSE Class 10 Biology 2018 exam was conducted on 26th March 2018. The exam started at 11 am and students were allotted 2 hours of time duration to finish the paper. Students can download the ICSE Class 10 Biology Question Paper Solution 2018 PDF from the link below.

ICSE Class 10 Biology Question Paper 2018

Download ICSE Class 10 Biology Question Paper Solution 2018 PDF

Students can have a look at the ICSE Class 10 Biology Question Paper Solution 2018 below:


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ICSE Class 10 Biology (Paper 3) Question Paper 2018 With Solution

Question 1:

(a) Name the following:

(i) The organization which procures and supplies blood during an emergency.

(ii) The blood vessel which supplies blood to the liver.

(iii) The number of chromosomes present in a nerve cell of a human being.

(iv) The layer of the eyeball that forms the transparent Cornea.

(v) The wax-like layer on the epidermis of leaves which reduces transpiration.

(b) Choose the correct answer from each of the four options given below:

(i) The number of Spinal nerves in a human being are:

A. 31 pairs

B. 10 pairs

C. 21 pairs

D. 30 pairs

(ii) Which one of the following is non-biodegradable?


B. Vegetable peel

C. Cardboard

D. Bark of trees

(iii) Aqueous humour is present between the:

A. Lens and Retina

B. Iris and Lens

C. Cornea and Iris

D. Cornea and Lens

(iv) A strong chemical substance which is used on objects and surfaces in our

surroundings to kill germs:

A. Cresol

B. Carbolic acid

C. Iodine

D. Mercurochrome

(v) Which one of the following is a Greenhouse gas?

A. Oxygen

B. Methane

C. Sulphur dioxide

D. Nitrogen

(c) Complete the following paragraph by filling in the blanks (i) to (v) with appropriate words:

To test a leaf for starch, the leaf is boiled in water to (i)__________. It is then boiled in

Methylated spirit to (ii)__________. The leaf is dipped in warm water to soften it. It is

placed in a petri dish, and (iii)__________ solution is added. The region of the leaf

which contains starch, turns (iv)__________ and the region which does not contain

starch, turns (v)__________.

(d) Match the items given in Column A with the most appropriate ones in Column B and rewrite the correct matching pairs.

Column A

Column B

(i) Cretinism

(a) Hypersecretion of adrenal cortex

(ii) Diabetes insipidus

(b) Hyposecretion of Thyroxine

(iii) Exophthalmic Goitre

(c) Hyposecretion of growth hormone

(iv) Adrenal virilism

(d) Hyposecretion of Vasopressin

(v) Dwarfism

(e) Hyposecretion of adrenal cortex

(f) Hypersecretion of Growth hormone

(g) Hypersecretion of Thyroxine

(e) Correct the following statements by changing the underlined words:

(i) Normal pale yellow colour of the urine is due to the presence of the pigment Melanin.

(ii) The outermost layer of Meninges is Pia mater.

(iii) The cell sap of root hair is Hypotonic.

(iv) Xylem transports starch from the leaves to all parts of the plant body.

(v) Nitrogen bonds are present between the complementary nitrogenous bases of DNA.

(f) Choose between the two options to answer the question specified in the brackets for the following:

An example is illustrated below.

Example: Corolla or Calyx (Which is the outer whorl?)

Answer: Calyx

(i) Blood in the renal artery or renal vein (Which one has more urea?)

(ii) Perilymph or endolymph (Which one surrounds the organ of Corti?)

(iii) Lenticels or stomata (Which one remains open always?)

(iv) Sclerotic layer or choroid layer (Which one forms the Iris?)

(v) Blood in the pulmonary artery or pulmonary vein (Which one contains less oxyhaemoglobin?)

(g) Given below is a representation of a type of pollution. Study the picture and answer the questions:

ICSE Class 10 Biology Qs Paper 2018 Solution-1

(i) Name the type of pollution shown in the picture.

(ii) Name one source of this pollution.

(iii) How does this pollution affect human health?

(iv) Write one measure to reduce this pollution.

(v) State one gaseous compound that leads to the depletion of the ozone layer and creates ‘Ozone holes’.

(h) Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong:

Example: Nose, Tongue, Arm, Eye

Answer: Odd Term – Arm, Category – Sense organs

(i) Detergents, X-rays, sewage, oil spills

(ii) Lumen, muscular tissue, connective tissue, pericardium

(iii) Dendrites, Medullary Sheath, Axon, Spinal cord

(iv) Centrosome, Cell wall, Cell membrane, Large vacuoles

(v) Prostate gland, Cowper’s gland, seminal vesicle, seminiferous tubules.



(i) Red Cross / Red Cross Society

(ii) Hepatic artery/Hepatic Portal Vein

(iii) 46 or 23 pairs

(iv) Sclera/Sclerotic layer

(v) Cuticle/cutin


(i) A.31 pairs

(ii) A. DDT

(iii) D. Cornea and Lens

(iv) A. Cresol

(v) B. Methane/CH4


(i) kill the cells

(ii) remove chlorophyll/decolourise the leaf

(iii) Iodine/Potassium iodide/K1/I2

(iv) blue black/blackish blue/dark blue/Indigo

(v) yellowish brown/reddish brown/yellow /golden brown


Column A

Column B

(i) Cretinism

(b) Hyposecretion of Thyroxine

(ii) Diabetes insipidus

(d) Hyposecretion of Vasopressin

(iii) Exophthalmic Goitre

(g) Hypersecretion of Thyroxine

(iv) Adrenal virilism

(a) Hypersecretion of adrenal cortex

(v) Dwarfism

(c) Hyposecretion of growth hormone


(i) Urochrome/Urobilin

(ii) Duramater

(iii) Hypertonic/Concentrated

(iv) Phloem

(v) Hydrogen/ H


(i) Renal artery

(ii) Endolymph

(iii) Lenticels

(iv) Choroid

(v) Pulmonary artery


(i) Air/Gaseous Pollution

(ii) Factories / industries / motor vehicles / cars / buses/ burning of garbage / brick kilns/trucks/lorries/Power Plant/oil refineries/burning crop residues/bursting crackers.

(iii) Respiratory problems / difficulty in breathing / Asthma / poor visibility / damages lungs / bronchitis/Respiratory inflammation/cough/sneezing/wheezing/eye irritation/allergies/toxic chemical enters food chain/disorders of liver,kidney,lung,hormonal

(iv) Use of unleaded petrol / CNG / Chimneys with filters or precipitators / switching off engines when not in use/use of carpool, public transport,planting more trees/regular check up of vehicles

(v) Styrofoam / CFCs / Refrigerants / Freons / Ccl4 / HFCs / HCFCs./halons/methyl bromide


(i) X-rays – water pollutants

(ii) Pericardium – parts of artery and vein / blood vessels

Lumen – Parts of heart/tissues of heart

(iii) Spinal Cord – parts of neuron / nerve cell

(iv) Centrosome – parts of plant cell

(v) Seminiferous tubules – accessory or reproductive glands of male

Question 2:

(a) The diagram given below represents a stage during cell division.

Study the same and answer the questions that follow:

ICSE Class 10 Biology Qs Paper 2018 Solution-2

(i) Identify whether it is a plant cell or an animal cell. Give a reason in support of your answer.

(ii) Name the stage depicted in the diagram. What is the unique feature observed in this stage?

(iii) Name the type of cell division that occurs during:

  1. Replacement of old leaves by new ones.
  2. Formation of gametes.

(iv) What is the stage that comes before the stage shown in the diagram?

(v) Draw a neat, labelled diagram of the stage mentioned in (iv) above keeping the chromosome number constant.

(b) Mention the exact location of the following:

(i) Epididymis

(ii) Lacrimal gland

(iii) Malleus

(iv) Hydathodes

(v) Pulmonary semilunar valve



(i) Plant cell/cell wall present, Aster absent, Aster present Animal cell,Centrioles / Centrosome present

(ii) Metaphase, Chromosomes are in the equatorial plane.


  1. Mitosis
  2. Meosis

(iv) Prophase


ICSE Class 10 Biology Qs Paper 2018 Solution-3


(i) on top of the testis/head, dorsal ride, back, rear of testis

(ii) upper sideward portion of orbit/upper outer part of eye/upper lateral region of eye

(iii) middle ear / between eardrum and incus. /inner surface of eardrum

(iv) Tips / margins of leaves / in leaves. /ends or apex of veins/apex of leaves/Epidermis of leaves

(v) In the right ventricle at the base of pulmonary artery. /at the opening of Pulmonary Artery

Question 3:

(a) Given below are diagrams showing the different stages in the process of fertilisation of an egg in the human female reproductive tract.

Study the diagrams and answer the questions:

ICSE Class 10 Biology Qs Paper 2018 Solution-4

(i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.

(ii) Where does fertilisation normally take place? What is ‘Implantation’ that follows fertilisation?

(iii) Mention the chromosome number of the egg and zygote in humans.

(iv) Explain the term ‘Gestation’. How long does Gestation last in humans?

(v) Draw a neat, labelled diagram of a mature human sperm.

(b) A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagrams and answer the questions.

ICSE Class 10 Biology Qs Paper 2018 Solution-5

(i) What aspect of photosynthesis is being tested in the above diagram?

(ii) Represent the process of photosynthesis in the form of a balanced equation.

(iii) Why was the plant kept in the dark before beginning the experiment?

(iv) What will be the result of the starch test performed on leaf ‘A’ shown in the diagram? Give an example of a plant with variegated leaves.

(v) Draw a neat labelled diagram of a chloroplast.



(i) D C B A/ C B A D

(ii) Oviduct, fixing of the embryo in the wall of uterus


Fallopian tube blastocyst in the wall of uterus

(iii) Egg – 23, Zygote – 46 / 23 pairs

(iv) Full term development of the embryo in the uterus, 280 days / 40 weeks/9 months. It is the period between implantation and birth of baby


ICSE Class 10 Biology Qs Paper 2018 Solution-6

(b) (i) Chlorophyll is necessary for photosynthesis.


ICSE Class 10 Biology Qs Paper 2018 Solution-7

(iii) to destarch the leaves.

(iv) Green part – blue black/blackish/dark blue/indigo

(v) Yellow part – brown/yellowish brown/golden yellow

ICSE Class 10 Biology Qs Paper 2018 Solution-8

Question 4:

(a) The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:

ICSE Class 10 Biology Qs Paper 2018 Solution-9

(i) Name the phenomenon that is depicted in the diagram. Define the phenomenon.

(ii) Give the technical term for the point of contact between the two nerve cells.

(iii) Name the parts numbered 1, 2 and 3.

(iv) How does the arrangement of neurons in the spinal cord differ from that of the brain?

(v) Mention two ways by which the spinal cord is protected in our body.

(b) Give appropriate biological or technical terms for the following:

(i) Process of maintaining water and salt balance in the blood.

(ii) Hormones which regulate the secretion of other endocrine glands.

(iii) Movement of molecules of a substance from their higher concentration to lower concentration when they are in direct contact.

(iv) The condition in which a pair of chromosomes carry similar alleles of a particular character.

(v) The complex consisting of a DNA strand and a core of histones.

(vi) The onset of menstruation in a young girl.

(vii) Squeezing out of white blood cells from the capillaries into the surrounding tissues.

(viii) The fluid which surrounds the foetus.

(ix) The relaxation phase of the heart.

(x) The difference between the birth rate and the death rate.


(a) (i) Reflex action, /Simple reflex/Reflex act

It is an automatic, [spontaneous, quick] involuntary response to a stimulus.

(ii) Synapse


  1. Sensory neuron / afferent fibre/Axon of sensory neuron
  2. Motor neuron / efferent fibre/Axon of motor neuron
  3. Grey matter/central canal

(iv) Spinal Cord – Cytons in the inner grey matter and axons in the outer white matter. /Cytons are inside & Axons are outside

Brain – Cytons in the outer grey matter and axons in the inner white matter. /Cytons

inside, Axons outside

(v) Meninges, Cerebrospinal fluid, Vertebral column / backbone.


(i) Osmoregulation/Osmotic regulation

(ii) Tropic hormones

(iii) Diffusion

(iv) Homozygous

(v) Nucleosome

(vi) Menarche

(vii) Diapedesis

(viii) Amniotic fluid

(ix) Diastole

(x) Growth rate of population

Question 5:

(a) The diagram given below is that of a structure present in a human kidney. Study the same and answer the questions that follow:

ICSE Class 10 Biology Qs Paper 2018 Solution-10

(i) Name the structure represented in the diagram.

(ii) What is the liquid entering part ‘1’ called? Name two substances present in this liquid that are reabsorbed in the tubule.

(iii) What is the fluid that comes to part ‘2’ called? Name the main nitrogenous waste in it.

(iv) Mention the three main steps involved in the formation of the fluid mentioned in (iii) above.

(vi) Name the substance which may be present in the fluid in part ‘2’ if a person suffers from Diabetes mellitus.

(b) Differentiate between the following pairs on the basis of what is indicated in the brackets.

(i) Leaf and Liver [form in which glucose is stored]

(ii) ATP and AIDS [expand the abbreviations]

(iii) Testosterone and Oestrogen [organ which secretes]

(iv) Ureter and Urethra [function]

(v) Hypotonic solution and Hypertonic solution [condition of a plant cell when placed in them]



(i) Nephron / Uriniferous tubule / Renal tubule / Kidney tubule

(ii) Glomerular filtrate, water / glucose / Sodium Chloride/Na ions/chloride ions/amino

acids/ultrafiltrate/Nephric filtrate

(iii) Urine, Urea

(iv) Ultrafiltration, selective reabsorption, tubular secretion, Glomerular filtration.

(v) Glucose / Sugar / Ketones


(i) Leaf – Starch, Liver – Glycogen

(ii) ATP – Adeosine triphosphate, AIDS – Acquired immune deficiency syndrome.

(iii) Testosterone – testis, Oestrogen – Ovary

(iv) Ureter – conducts urine from the kidney to the urinary bladder/transports urine from

Renal pelvis to bladder

Urethra – expulsion of urine from the urinary bladder/eliminates urine from body/expels

urine and semen.

(v) Hypotonic – Turgid / Turgidity

Hypertonic – Flaccid / Plasmolysed/Flaccidity

Question 6:

(a) Given below is a diagram of a human blood smear.

Study the diagram and answer the questions that follow:

ICSE Class 10 Biology Qs Paper 2018 Solution-11

(i) Name the components numbered ‘1’ to ‘4’.

(ii) Mention two structural differences between the parts ‘1’ and ‘2’.

(iii) Name the soluble protein found in part ‘4’ which forms insoluble threads during clotting of blood.

(iv) What is the average lifespan of the component numbered ‘1’?

(v) Component numbered ‘1’ do not have certain organelles but are very efficient in their function. Explain.

(b) Give biological explanations for the following:

(i) Education is very important for population control.

(ii) The placenta is an important structure for the development of a foetus.

(iii) All the food chains begin with green plants.

(iv) Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.

(v) We should not put sharp objects into our ears.


(a) (i)

  1. RBCs / Erythrocytes
  2. WBC / Leucocytes/named WBC
  3. Platelets / Thrombocytes
  4. Plasma

(ii) 1. RBC

– Biconcave disc like

– Nucleus absent

– Haemoglobin present

2. WBC

– Irregular, amoeboid

– Nucleus present

– Haemoglobin absent

(iii) Fibrinogen

(iv) 120 days

(v) Absence of nucleus increases the surface area for absorbing more oxygen / more RBCs

can be accommodated.

Absence of mitochondria means they do not use oxygen for respiration, hence all the

transported to tissues.

Absence of endoplasmic reticulum increases the flexibility to move through narrow



(i) Desire for a male child, ignorance regarding the functioning of reproductive system,

gender inequality, etc can be eliminated with education and population increase can be

checked. /to create awareness for birth control measures/vital for growth of nation/Food,

water, environmental pollution, lack of job opportunities can be eliminated /to improve

quality of life.


  • Transport of oxygen / digested foods / hormones / antibodies from maternal blood to foetal blood/nutrients /glucose etc.
  • Elimination of nitrogenous wastes / carbon dioxide from foetal blood to maternal blood./urea, uric acid, creatinine
  • Secretes oestrogen and progesterone
  • Acts as a barrier to germs.

(iii) All animals / organisms depend on green plant for oxygen and directly or indirectly depend

for food.

(iv) Soil medium becomes hypertonic. Roots lose water by exosmosis/ plasmolysis and the plants wilt.

(v) Can damage eardrum / tympanum leading to deafness

Question 7:

(a) The diagram below represents a process in plants.

The setup was placed in bright sunlight. Answer the following questions:

ICSE Class 10 Biology Qs Paper 2018 Solution-12

(i) Name the physiological process depicted in the diagram. Why was oil added to the water?

(ii) When placed in bright sunlight for four hours, what do you observe with regard to

the initial and final weight of the plant? Give a suitable reason for your answer.

(iii) What happens to the level of water when this setup is placed in:

  1. Humid conditions?
  2. Windy conditions?

(iv) Mention any three adaptations found in plants to overcome the process mentioned

in (i).

(v) Explain the term ‘Guttation’.

(b) A pea plant which is homozygous for Green pods which are inflated [GGII] is crossed with a homozygous plant for yellow pods which are constricted [ggii]. Answer the following questions:

(i) Give the phenotype and genotype of the F1 generation. Which type of pollination has occurred to produce F1 generation?

(ii) Write the phenotypic ratio of the F2 generation.

(iii) Write the possible combinations of the gametes that can be obtained if two F1 hybrid plants are crossed.

(iv) State Mendel’s law of ‘Segregation of Gametes’.

(v) What is the scientific name of the plant which Mendel used for his experiments on inheritance?



(i) Absorption of water by roots, Transpiration by leaves. To prevent evaporation of water.

(ii) Weight of the plant reduces. Rate of transpiration is more than the rate of absorption of water. /Final weight is less than initial weight because leaves transpire.


1. Remains same

2. Reduces

(iv) Sunken stomata, fewer stomata, narrow leaves, Rolled or folded leaves, loss of leaves, leaves modified to spines, thick cuticle on leaves. /small leaves/needle like leaves/hair on leaves/multiple epidermis.

(v) Loss of water (as droplets) from the margins / hydathodes of leaves. /apex, tips of leaves.


(i) Phenotype: All have green, inflated pods.

Genotype: GgIi, Cross pollination

(vii) 9 : 3 : 3 : 1

(viii) GI, Gi, gI, gi

(iv) Two members of a pair of factors separate during gamete formation./The two alleles

of a trait separate during gamate formation.

(v) Pisum Sativum

We hope students found this information on “ICSE Class 10 Biology Question Papers Solutions 2018” helpful for their exam preparation. They can also access solutions of other subjects of ICSE Class 10 Previous Years Question Papers by clicking here. Stay tuned to BYJU’S for the latest update on ICSE/CBSE/State Boards/Competitive exams. Also, download the BYJU’S App and fall in love with learning.


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