Question 1

Question 1(ii)Which one of the following is a biodegradable waste?Metal cansE-wastePlasticFlowers

Accepted Answer

FlowersReason — Biodegradable waste refers to organic materials that can be broken down naturally by microorganisms and environmental processes. Flowers are a type of organic waste that can decompose over time, making them biodegradable whereas metal cans, e-waste, plastic are non-biodegradable waste.

Question 2

Question 1(vi)Haploid number of chromosomes are found in:NephronsNeuronsSkin cellsSperms

Accepted Answer

SpermsReason — The gametes (sperm or ovum) are formed as a result of meiosis in which the number of chromosomes are halved.

Question 3

Question 1(viii)The statistical study of human population is called:MortalityDemographyNatalityEquality

Accepted Answer

DemographyReason — Demography is the term given to the statistical study of human population.

Question 4

Question 1(xi)The site of light reaction in the cells of a green leaf is:NucleusGrana of chloroplastCytoplasmStroma of chloroplast

Accepted Answer

Grana of chloroplastReason — The site of light reaction in the cells of a green leaf is grana of chloroplast which has chlorophyll.

Question 5

Question 1(xii)The paper used to demonstrate unequal transpiration in a dicot leaf is:Filter paperLitmus paperStarch paperCobalt chloride paper

Accepted Answer

Cobalt chloride paperReason — Cobalt chloride paper turns from blue to pink when exposed to moisture. Hence, it is used to demonstrate unequal transpiration in a dicot leaf.

Question 6

Question 2(ii)Arrange and rewrite the terms in each group in correct order to be in a logical sequence beginning with the term that is underlined:(a) Snake, Rabbit, Cabbage, Hawk.(b) Xylem, Soil water, Cortical cells, Root hair.(c) Receptor, Response, Effector, Spinal Cord.(d) Fovea, Lens, Cornea, Conjunctiva.(e) Testis, Urethra, Sperm duct, Epididymis.

Accepted Answer

(a) Cabbage → Rabbit → Snake → Hawk.(b) Soil water → Root hair → Cortical cells → Xylem(c) Receptor → Spinal Cord → Effector → Response(d) Conjunctiva → Cornea → Lens → Fovea(e) Testis → Epididymis → Sperm duct → Urethra

Question 7

Question 2(iii)Match the items given in Column I with most appropriate ones in Column II and rewrite the correct matching pairs:Column IColumn IIHyposecretion of Thyroxine in adultsDiabetes insipidusHyposecretion of InsulinMyxoedemaHypersecretion of Growth hormone in childhoodDwarfismHyposecretion of ADHGigantismHypersecretion of ThyroxineDiabetes mellitus Exophthalmic goitre Cretinism

Accepted Answer

Column IColumn IIHyposecretion of Thyroxine in adultsMyxoedemaHyposecretion of InsulinDiabetes mellitusHypersecretion of Growth hormone in childhoodGigantismHyposecretion of ADHDiabetes insipidusHypersecretion of ThyroxineExophthalmic goitre

Question 8

Question 2(iv)Choose the odd one out from the following terms and name the category to which the others belong:(a) Used bandages, Pesticides, Face masks, Syringes.(b) Dust, Smoke, Carbon monoxide, Effluents(c) Uterus, Urethra, Urinary bladder, Ureter(d) Menstrual phase, Telophase, Follicular phase, Luteal phase(e) Malleus, Incus, Cochlea, Stapes

Accepted Answer

(a) Odd one : PesticidesUsed bandages, Face masks, Syringes — Bio-medical wastes(b) Odd one : EffluentsDust, Smoke, Carbon monoxide — Air pollutant(c) Odd one : UterusUrethra, Urinary bladder, Ureter — Parts of Excretory System(d) Odd one : TelophaseMenstrual phase, Follicular phase, Luteal phase — Menstrual cycle(e) Odd one : CochleaMalleus, Incus, Stapes — Ear ossicles

Question 9

Question 3(i)Write the overall chemical equation for photosynthesis.

Accepted Answer

Balanced chemical equation representing the process of photosynthesis is given below:6CO2+12H2O→chlorophylllight energyC6H12O6+6H2O+6O2↑6	ext{CO}_2 + 12	ext{H}_2	ext{O} \xrightarrow[	ext{chlorophyll}]{	ext{light energy}} 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{H}_2	ext{O} + 6	ext{O}_2 \uparrow6CO2​+12H2​Olight energychlorophyll​C6​H12​O6​+6H2​O+6O2​↑

Question 10

Question 3(iii)Differentiate between Karyokinesis and Cytokinesis.

Accepted Answer

KaryokinesisCytokinesisIt is the division of the nucleus.It is the division of the cytoplasm.It is the first division.It occurs after karyokinesis.It results in the formation of two nuclei.It results in the formation of two daughter cells.

Question 11

Question 3(iv)Excessive use of fertilizers in agricultural fields reduces the yield of crops. Justify the statement.

Accepted Answer

Excessive use of fertilizers in agricultural fields leads to accumulation of unused chemicals in soil. The soil becomes either acidic or basic, making the soil unfit for cultivation. Also the beneficial microorganisms present in the soil are killed due to chemicals and disturbed ph of soil. Therefore, excessive use of fertilizers in agricultural fields reduces the yield of crops.

Question 12

Question 3(v)Study the diagram given below and answer the questions that follow:(a) Name the phenomenon depicted by the shoot in the above diagram.(b) Which plant hormone plays an important role in the above movement?(c) Complete and rewrite the given statement by filling in the correct terms:Shoots show positive ............... whereas, roots show positive ............... .

Accepted Answer

(a) Phototropism(b) Auxin(c) Shoots show positive phototropism whereas, roots show positive geotropism .

Question 13

Question 4(ii)What is Active transport?

Accepted Answer

Active transport is the passage of a substance (salt or ion) from its lower to higher concentration through a living cell membrane using energy from the cell.

Question 14

Question 4(iv)State Mendel's 'Law of Segregation'.

Accepted Answer

Law of Segregation (also called the law of purity of gametes) — The two members of a pair of factors separate during the formation of gametes. They do not blend but segregate or separate into different gametes. The gametes combine together by random fusion at the time of zygote formation.

Question 15

Question 4(v)Draw a neat, labelled diagram of a human sperm.

Accepted Answer

Labelled diagram of a human sperm is shown below:

Question 16

Question 5(iii)Mention two factors responsible for population explosion in India.

Accepted Answer

Two factors responsible for population explosion in India are:Desire for a male child.Illiteracy and Lack of awareness about birth control measures.

Question 17

Question 5(iv)Name any two resources which come under pressure due to rising population.

Accepted Answer

Two resources which come under pressure due to rising population are:WaterLand

Question 18

Question 5(v)The diagram given below depicts the climate change on planet Earth. Answer the following questions:(a) Name the climatic phenomenon for the increase in Earth's temperature.(b) Mention one reason for this warming.(c) What measure can be taken to prevent this climate change?

Accepted Answer

(a) Global warming(b) Green house effect due to accumulation of greenhouse gases like Carbon dioxide (CO2) and Methane (CH4) in the atmosphere.(c) To prevent global warming, use of fossil fuels should be minimized and renewable energy sources should be adopted rapidly. Deforestation should be stopped and more trees should be planted.

Question 19

Question 6(i)Define the term Transpiration.

Accepted Answer

Transpiration is the loss of water in the form of water vapour from the aerial parts (leaves and stem) of the plant.

Question 20

Question 6(v)Draw a neat, labelled diagram of a Malpighian Capsule.

Accepted Answer

Below labelled diagram shows Malpighian Capsule:

Solved 2023 Question Paper ICSE Class 10 Biology

Section A

Section B