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SCIENCE–X

SA—IIMarks : 90

Units Marks

I. Chemical Substances – Nature and Behaviour 23

II. World of Living 30

III. Natural Phenomena 29

V. Natural Resources 08

Total 90

Covalent bonding in carbon compounds. Versatile nature of carbon.

Homologous series Nomenclature of carbon compounds containing functional groups

(halogens, alcohol, ketones, aldehydes, alkanes and alkynes), difference between saturated

hydrocarbons and unsaturated hydrocarbons. Chemical properties of carbon compounds

(combustion, oxidation, addition and substitution reactions). Ethanol and ethanoic acid

(only properties and uses), soaps and detergents.

Need for classification, Modern Periodic table,

gradation in properties, valency.Atomic number, metallic and non-metallic properties.

Reproduction in animals and plants (asexual and sexual) reproductive

health-need for and methods of family planning, safe sex vs HIV/AIDS. Child bearing and

women’s health.

Heredity; Mendel’s contribution – Laws for inheritance of traits :

Sex determination : brief introduction; Basic concepts of evolution.

Reflection of light at curved surfaces, images formed by spherical mirrors, centre

of curvature, principal axis, principal focus, focal length. Mirror Formula (Derivation not

required), Magnification.

Refraction; laws of refraction, refractive index. Refraction of light by spherical lens, image

formed by spherical lenses, lens formula (Derivation not required), Magnification. Power of

THEME : MATERIALS (25 Periods)

Unit-I : Chemical Substances – Nature and Behaviour

THEME : THE WORLD OF THE LIVING (30 Periods)

Unit-II : World of Living

THEME : NATURAL PHENOMENA (23 Periods)

Carbon Compounds :

Periodic Classification of Elements :

Reproduction :

Heredity and Evolution :

Unit-III :

SYLLABUS

Syllabus.ps

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a lens; Functioning of a lens in human eye, defects of vision and their corrections,

applications of spherical mirrors and lenses.

Refraction of light through a prism, dispersion of light, scattering of light, applications in

daily life.

Conservation and judicious use of natural resources.

Forest and wild life, coal and petroleum conservation. Examples of People’s participation

for conservation of natural resources.

Big dams : advantages and limitations; alternatives if any. Water

harvesting. Sustainability of natural resources.

Ecosystem, environmental problems. Ozone depletion, waste

production and their solutions, Biodegradable and non-biodegradable substances.

THEME : NATURAL RESOURCES (12 Periods)

Unit-V : Natural Resources

Conservation of Natural Resources

Management of Natural Resources :

Regional Environment :

Our Environment :

PRACTICALS

SECOND TERM

Practicals should be conducted alongside the concepts taught in theory classes.

1. To study the following properties of acetic acid (ethanoic acid) :(i) odour

(ii) solubility in water(iii) effect on litmus(iv) reaction with sodium bicarbonate

2. To study saponification reaction for preparation of soap.3. To study the comparative cleansing capacity of a sample of soap in soft and hard

water.4. To determine the focal length of

(i) Concave mirror(ii) Convex lens

by obtaining the image of a distant object.5. To trace the path of a ray of light passing through a rectangular glass slab for

different angles of incidence. Measure the angle of incidence, angle of refraction,angle of emergence and interpret the result.

6. To study (a) binary fission in Amoeba and (b) budding in yeast with the help ofprepared slides.

7. To trace the path of the rays of light through a glass prism.8. To find the image distance for varying object distances in case of convex lens and

draw corresponding ray diagrams to show the nature of image formed.9. To study homology and analogy with the help of preseved / available specimens of

either animals or plants.10. To identify the different parts of an embryo of a dicot seed (Pea, gram or red kidney

bean).

2.prn

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657-Cont.pmd 9/11/2016, 4:55 PM1

CONTENTS

●●●●● C.B.S.E. Board Paper (Delhi)—2016 SA-II (Solved) 1–14

●●●●● C.B.S.E. Board Paper (Outside Delhi)—2016 SA-II (Solved) 15–34

●●●●● Sample Question Papers-1 & 2 (Solved) S-1–S-19

(Based on the Latest Guidelines Issued by CBSE)

Chapterwise Expected Questions (Solved)

1. Carbon and its Compounds 1–32

2. Periodic Classification of Elements 33–57

3. How do Organisms Reproduce ? 58–87

4. Heredity and Evolution 88–117

5. Light : Reflection and Refraction 118–166

6. The Human Eye and Colourful World 167–192

7. Our Environment 193–209

8. Management of Natural Resources 210–220

●●●●● Practical Based Questions 221–239

(Chemistry, Biology, Physics)

Model Question Papers (For Practice)

Model Question Paper–1 M-1–M-4

Model Question Paper–2 M-5–M-7

Model Question Paper–3 M-8–M-10

Model Question Paper–4 M-11–M-13

Model Question Paper–5 M-14–M-16

Model Question Paper–6 M-17–M-19

Model Question Paper–7 M-20–M-22

Model Question Paper–8 M-23–M-25

Model Question Paper–9 M-26–M-28

Model Question Paper–10 M-29–M-31

657-Cont.pmd 9/12/2016, 2:15 PM2

C.B.S.E. Board Paper (Delhi)—2016 SA-II (Solved)

CLASS—X

SUMMATIVE ASSESSMENT—II

SCIENCE

SET—ITime Allowed : 3 Hours] [Maximum Marks : 90

General Instructions :

(i) The question paper comprises two Sections, A and B. You are to attempt both the

sections.

(ii) All questions are compulsory.

(iii) There is no choice in any of the questions.

(iv) All questions of Section A and all questions of Section B are to be attempted

separately.

(v) Question numbers 1 to 3 in Section A are one mark questions. These are to be

answered in one word or in one sentence.

(vi) Question numbers 4 to 6 in Section A are two marks questions. These are to be

answered in about 30 words each.

(vii) Question numbers 7 to 18 in Section A are three marks questions. These are to be

answered in about 50 words each.

(viii) Question numbers 19 to 24 in Section A are five marks questions. These are to be

answered in about 70 words each.

(ix) Question numbers 25 to 33 in Section B are multiple choice questions based on

practical skills. Each question is a one-mark question. You are to select one most

appropriate response out of the four provided to you.

(x) Question numbers 34 to 36 in section B are two-marks questions based on practical

skills. These are to be answered in brief.

SECTION—A

Q. 1. Write the next homologue of each of the following : 1

(i) C2H4

(ii) C4H6.

Ans. (i) C3H6 (ii) C5H8.

Q. 2. Name the part of Bryophyllum where the buds are produced for

vegetative propagation. 1

Ans. Leaves.

Q. 3. List two natural ecosystems. 1

Ans. 1. Pond ecosystem and 2. Forest ecosystem.

Q. 4. State two positions in which a concave mirror produces a magnified

image of a given object. List two differences between the two images. 2

Ans. The two positions of image produced by concave mirror are :

(i) When object is placed between principal focus and pole of the mirror.

(ii) When the object is placed between principal focus F and centre of curvature.

Differences. (1) In first case image is behind mirror on the side away from object

whereas in second case image is formed beyond C.

1

Board-Delhi.pmd 9/12/2016, 1:28 PM1

2 MBD SURE SHOT SAMPLE PAPERS (X C.B.S.E.)

(2) In first case, image is erect and virtual. In second case, the image is real and

inverted.

Q. 5. List four advantages of properly managed watershed management. 2

Ans. Advantages of watershed management :

1. Proper storage of water with provision for use in dry season.

2. It helps in moderation of floods.

3. It helps in maintaining sustainable environment.

4. It minimises the risk of drought.

Q. 6. Explain giving example where active involvement of local people lead

to efficient management of forest. 2

Ans. Local people were working traditionally for conservation of forests. The case of

the Bishnoi community in Rajasthan, for whom conservation of forest and wildlife has

been a religious tenet. The Government of India had recently instituted an ‘Amrita Devi

Bishnoi National Award for Wildlife Conservation’ in the memory of Amrita Devi Bishnoi,

who in 1731 sacrificed her life along with 363 others for the protection of ‘Khejri’ trees in

Khejrali village near Jodhpur in Rajasthan.

Q. 7. What are covalent compounds ? Why are they different from ionic

compounds ? List their three characteristic properties.

Ans. These are the compounds which contain convalent bonds. The covalent compounds

are different from ionic compounds because covalent compounds involve covalent bonds

whereas ionic compounds involve ionic bonds.

Characteristics of covalent compounds :

(i) Generally they have low melting and boiling points.

(ii) They are soluble is organic solvents.

(iii) They don’t conduct electric current.

Q. 8. When ethanol reacts with ethanoic acid in the presence of conc. H2SO

4,

a substance with fruity smell is produced. Answer the following : 3

(i) State the class of compounds to which the fruity smelling compounds

belong. Write the chemical equation for the reaction and write the chemical

name of the product formed.

(ii) State the role of conc. H2SO

4 in this reaction.

Ans. (i) Ester

C2H5OH + CH3COOH ⎯⎯⎯⎯⎯⎯→42Conc.H SO

CH3 COOC2H5 + H2O

Ethyl acetate

(ii) Conc. H2SO4 acts as a dehydrating agent.Q. 9. Calcium is an element with atomic number 20. Stating reason answer

each of the following questions : 3(i) Is calcium a metal or non-metal ?(ii) Will its atomic radius be larger or smaller than that of potassium with

atomic number 19 ?(iii) Write the formula of its oxide.Ans. Ca2O — 2, 8, 8, 2(i) Calcium is a metal because it has two electrons in its valence shell.(ii) Calcium has smaller radius than potassium due to higher nuclear charge.(iii) CaO.

Board-Delhi.pmd 9/12/2016, 1:28 PM2

3BOARD PAPER (DELHI) – 2016

Q. 10. An element ‘M’ with electronic configuration (2, 8, 2) combines separately

with (NO3)–, (SO

4)2– and (PO

4)3– radicals. Write the formula of the three

compounds so formed. To which group and period of the Modern Periodic Table

does the elements ‘M’ belong ? Will ‘M’ form covalent or ionic compounds ? Give

reason to justify your answer. 3

Ans. M(NO3)2, MSO4 , M3(PO4)2

M belongs to group 2 and 3rd period.

M will form ionic compounds because it has less than 4 electrons in its valence shell

and has low ionisation enthalpy.

Q. 11. How do organisms, whether reproduced asexually, or sexually maintain

a constant chromosome number through several generations ? Explain with

the help of suitable example. 3

Ans. (a) 1. Chromosome number is maintained by reduction division during gamete

formation.

2. As the haploid gametes fuse during fertilization, diploid number is restored.

3. Zygote undergoes mitosis to form the complete offspring.

In human cells there are 46 (2n) chromosomes. During gametogenesis haploid gametes

23 (n) chromosomes are present. And as a result of fertilization 46 (2n) number of

chromosome is restored due to fusion of gametes.

(b) Asexually reproducing organisms maintain chromosome number by mitosis only.

Q. 12. Name the parts A, B and C shown in the following diagram and state

one function of each. 3

Ans.

S.No. Name Function

A Anther Produces pollen

B Style 1. Connects ovary with stigma

2. Allows passage of pollen tube

C Ovule Seed formation.

Q. 13. Suggest three contraceptive methods to control the size of human

population which is essential for the health and prosperity of a country. State

the basic principle involved in each.

A

B

C

Board-Delhi.pmd 9/12/2016, 1:28 PM3

MBD Sure Shot CBSE Sample PapersSolved Class 10 Science (Term-II) 2017

Publisher : MBD GroupPublishers

ISBN : 9789383949458 Author : Panel Of Experts

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