2009 Assam State Central University of Tibetan Studies CBSE CLASS X Question paper
DESIGN OF QUESTION PAPER
SAMPLE QUESTION PAPER
X - SCIENCE (THEORY)
Time : 2½ Hours Max. Marks : 60
The weightage to marks over different dimensions of the question paper shall be as under:
A. Weightage to Content/Subject units
S.No Content Unit Marks
1. Chemical Substances 18
2. World of living 16
3. Effects of current 10
4. Light 8
5. Natural Resources 8
Total 60
B. Weightage to forms of Questions
S.No. Form of Questions Marks for No. of Total Marks
each question questions
1. Very short answer type (VSA) 01 09 09
2. Short answer type (SA I) 02 09 18
3. Short answer type (SA II) 03 06 18
4. Long answer type (LA) 05 03 15
Total 27 60
C. Number of Sections
The question paper will have two sections A & B
D. Scheme of Options
There will be no overall choice. However, there is an internal choice in every question of
five marks category.
304
E. Weightage to difficulty level of questions
S.No. Estimated difficulty level of Percentage
questions
1. Easy 15
2. Average 70
3. Difficult 15
F. Typology of Questions
In order to assess different abilities related to the subject, the question paper includes
open-ended questions, drawing/illustrations based questions, communication-skill based
questions and activity-based questions.
About 20% weightage has been assigned to questions testing higher order
thinking skills of learners.
305
BLUE PRINT I
X SCIENCE (THEORY)
VSA SA - I SA - II LA Total
Unit (1 Mark) (2 Marks) (3 Marks) (5 Marks)
Chemical Substances 3(3) 4(2) 6(2) 5(1) 18(8)
World of Living 2(2) 6(3) 3(1) 5(1) 16(7)
Effects of current 1(1) 4(2) - 5(1) 10(4)
Light 2(2) - 6(2) - 8(4)
Natural Resources 1(1) 4(2) 3(1) - 8(4)
Total 9(9) 18(9) 18(6) 15(3) 60(27)
Form of
Questions
306
SAMPLE PAPER I
X - SCIENCE (THEORY)
Time : 2½ Hours Max. Marks : 60
General Instructions
1. The question paper comprises of two sections A and B. You are to attempt both the
sections.
2. All questions are compulsory.
3. There is no overall choice However, internal choice has been provided in all the three
questions of five marks category. Only one option in such questions is to be attempted.
4. All questions of section A and all questions of section B are are to be attempted separately.
5. Questions 1 to 6 in section A and 17 to 19 in section B are short question.These carry one
mark each.
6. Questions 7 to 10 in section A and 20 to 24 in section B are short answer type questions
and carry two marks each.
7. Questions 11 to 14 in section A and 25 to 26 in section B are also short answer type
questions and carry three marks each.
8. Questions 15 and 16 in section A and question 27 in section B are long answer type
questions and carry five marks each.
SECTION A
1. A ray of light LM is incident on a mirror as shown in the figure. The angle of incidence for
this ray is the angle between it and the line joining two other points in the figure. Name
these two points.
2. Metals generally occur in solid state. Name and write symbol of a metal that exists in
liquid state at room temperature.
3. During summer season, a milkman usually adds a very small amount of baking soda to
fresh milk. Give one reason.
307
4. The following table gives the values of refractive indices of a few media.
S.No. 1 2 3 4 5
Medium Water Crown Glass Rock salt Ruby Diamond
Refractive 1.33 1.52 1.54 1.71 2.42
Index
Use this table to give an example of (i) a medium pair so that light speeds up when it goes
from one of these media to another. (ii) a medium pair so that light slows down when it
goes from one of these media to another.
5. Why potato chips manufacturers fill the packet of chips with nitrogen gas?
6. Alloys are used in electrical heating devices rather than pure metals. Give one reason.
7. Tooth enamel is one of the hardest substances in our body. How does it undergo damage
due to eating chocolates and sweets? What should we do to prevent it?
8. A student has been collecting silver coins and copper coins. One day she observed a
black coating on silver coins and a green coating on copper coins. Which chemical
phenomenon is responsible for these coatings? Write the chemical name of black and
green coatings.
9. Two students perform the experiments on series and parallel combinations of two given
resistors R1 and R2 and plot the following V-I graphs.
Which of the graphs is (are) correctly labelled in terms of the words ‘series' and parallel'
Justify your answer.
10. Draw the pattern of magnetic field lines of a current carrying solenoid. What does the
pattern of field lines inside the solenoid indicate? Write one application of magnetic field
of current carrying solenoid.
11. A student finds the writing on the blackboard as blurred and unclear when sitting on the
last desk in the classroom. He however, sees it clearly when sitting on the front desk at an
approximate distance of 2m from the blackboard.
Draw ray diagrams to illustrate the formation of image of the blackboard writing by his
eye-lens when he is seated at the (i) last desk (ii) front desk.
308
Name the kind of lens that would help him to see clearly even when he is seated at the last
desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
12. State which of the following chemical reactions will take place or not, giving suitable reason
for each.
Zn (s) + Cu SO4 (aq) ----> Zn SO4 (aq) + Cu (s)
Fe (s) + Zn SO4 (aq) ----> Fe SO4 (aq) + Zn (s)
Zn (s) + Fe SO4 (aq) ----> Zn SO4 (aq) + Fe (s)
13. (a) Two lenses have power of (i) + 2D (ii) - 4D. What is the nature and focal length
of each lens.?
(b) An object is kept at a distance of 100cm from each of above lenses.
Calculate the (i) image distance (ii) magnification in each of the two cases.
14. The following table shows the position of six elements A, B, C, D, E and F in the periodic table.
Groups 1 2 3 to 12 13 14 15 16 17 18
Periods
2. A B C
3. D E F
Using the above table answer the following questions :
(a) Which element will form only covalent compunds?
(b) Which element is a metal with valency 2?
(c) Which element is a non-metal with valency of 3?
(d) Out of D and E, which one has a bigger atomic radius and why?
(e) Write a common name for the family of elements C and F.
15. An organic compound ‘A' is widely used as a preservative in pickles and has a molecular
formula C2H2O2. This compound reacts with ethanol to form a sweet smelling
compound ‘B.
(i) Identify the compound ‘A'
(ii) Write the chemical equation for its reaction with ethanol to form compound ‘B'.
(iii) How can we get compound ‘A' back from ‘B'?
(iv) Name the process and write corresponding chemical equation.
(v) Which gas is produced when compound ‘A' reacts with washing soda?
write the chemical equation.
OR
(a) Why does carbon form largest number of compounds?
(b) Why are some of these called saturated and other unsaturated compounds?
309
(c) Which of these two is more reactive?
(d) Write the names of the compounds.
16. In a household electric circuit different appliances are connected in parallel to one another.
Give two reasons.
An electrician puts a fuse of rating 5A in that part of domestic electrical circuit in which an
electrical heater of rating 1.5kW, 220V is operating. What is likely to happen in this case
and why? What change, if any, needs to be made?
OR
You are given following current-time graphs from two different sources:
(i) Name the type of current in two cases.
(ii) Identify any one source for each type of these currents.
(iii) What is the frequency of current in case II in India?
(iv) Use above graphs to write two difference between the current in two cases.
SECTION B
17. After a vigorous exercise, you may experience cramps in your leg muscles. Why does this
happen? 1
18. Which organ secretes a hormone when the blood sugar rises. Name a digestive enzyme
released by this organ. 1
19. Name two gases, other than carbon-di-oxide, that are given out during burning of fossil
fuel and contribute towards acid rain formation. 1
20. Out of two solar cookers, one was covered by a plane glass slab and the other was left
open. Which of the two solar cookers will be more efficient and why? 2
310
21. In the flow chart given below, fill in the blank spaces with the kind of energy available. 2
22. By comparing the similarity of nucleotide sequences in DNA of different kinds of organisms,
evolutionary relationships can be established. Arrange the following according to their
evolutionary closeness. (You may use your knowledge of classification also). Whose DNA
among these do you think is most similar to that of humans? 2
cockroach, mango tree, gorilla, fish
23. Study carefully the food chains given below:-
Food chain I : grass - grasshopper - frog
Food chain II : wheat - rat - snake - hawk
To which of the two consumers, frog or hawk will more energy (percent)
be available and why? 2
24. What do the following transport?
(i) xylem (ii) phloem (iii) pulmonary vein (iv) Vena Cava
25. Give one term caption for
the two pictures given here.
Define the term and give
its signifance in evolution 3
26. Why are environmentalists
insisting upon ‘sustainable natural resource management'? Give any three reasons
27. Study the given data and answer the questions following the data.
311
Parental plants F1 (first generation off spring) F2 (offspring of self pollination of F1
cross fertilised &
seeds collected
Male parent 330 seeds sown Out of 44 seeds
always bore and observed 33 seeds
red flowers. gave plants with
Female parent All 330 gave red flowers and
always had red flowers 11 seeds gave plants with
white flowers. white flowers
(i) What is the term for this type of cross?
(ii) What does the data of the column marked F1 indicate?
(iii) Express the genotype of the (a) parents (b) F1 Progeny and (c) F2 Progeny 5
OR
Study the picture given below and comment on the encircled organisms with respect to
(i) the category according to the food they eat.
(ii) trophic level to which they belong.
(iii) percentage of energy available at their trophic level.
(iv) two abiotic components of the ecosystem inhabited by them.
(v) energy used for food
production by the producers.
MARKING SCHEME
PAPER I
312
X - SCIENCE
Q.No. Value Points Marks
SECTION A
1. M and C 1
2. Mercury, Hg 1
3. Being alkaline, it neutralizes the lactic acid present in the milk and prevents its
spoilage. 1
4. (i) Any pair of media from higher refractive index to lower refractive index
say medium 2 to 1
(ii) Any pair of media from lower to higher refractive index (½+½) = 1
5. To prevent chips from getting oxidised.
6. Alloys have high melting point./ do not oxidise (burn) readily at high temp.
1
7. Tooth enamel is made up of calcium phosphate which gets corroded when the pH
in the mouth is below 5.5. Bacteria present in the mouth produce acids by degradation
of sugar and food particles in the mouth after eating. Tooth pastes, which
are bases, neutralise the acid. 2
8. ?? Corrosion 1
?? Black coating : Silver sulphide ½
Green coating : Copper carbonate ½
9. Both are correct
Resistance R = ½
Also = ½
Both the diagrams show the correct result
10. ?? Pattern of magnetic field lines ½
?? It indicates that the magnetic field is the same at all points inside the 1
solenoid
?? For making an electromagnet ½
11. Correct Ray Diagrams ½+½
Concave lens/Correct ray diagram ½+½
12. (a) Reaction will take place because Zn is above Cu in the activity series
(b) Reaction will not take place as Fe is below Zn in the activity series and
313
cannot displace Zn from its compounds.
(c) Reaction will take place as Zn is above Fe in the activity series. 1x3= 3
13. (a) (i) + 50cm, convex lens ½+½
(ii) - 25cm, concave lens
(b) (i) =
= +100cm, m = 1 ½+½ 3
(ii) =
= -20cm, m = ½+½
14. (a) E
(b) D
(c) B
(d) D, atomic radius decreases with greater nuclear charge in the same
period 1x5= 5
(e) Noble Gases / Inert Gases
15. (i) Ethanoic Acid / Acetic Acid 1
(ii) CH3 COOH + C2 H5 OH ----> CH3 COOC2 H5 + H2O 1
(iii) Saponification
CH3 COO C2 H5 NaoH > C2 H5 OH + CH3 COOH ½+½= 1
(iv) CO2 gas 1
2 CH3 COOH + Na2 Co3 ----> 2 CH3 COO Na + H2O + CO2 1
OR
(a) Due to the property of Catenation. Carbon has unique property to form
bonds with other carbon atoms. 1
(b) Saturated compounds are those in which all the valencies of carbon
atoms are satisfied by single bond between them.
In unsaturated compounds, the valency per carbon atom remains unsatisfied.
Thus there is a double bond or triple bond between carbon atoms. 2
(c) Unsaturated hydrocarbon 1
314
(d) (i) Bromoethane
(ii) Hexyne
16. (i) The appliances can be operated independently. ½
(ii) They get the same applied voltage ½
The fuse will not blow off even if the current in these devices were to
exceed their safe current values. This could damage these devices
and even cause fire. 3
Any fuse of lower amperage needs to be put in the circuit 1
OR
(i) I : Direct current ; I I : Alternating current 1
(ii) I : Dry cell ; I I : Alternating current generator 1
(iii) I : Zero ;I I : 50 cycles per second 1
(iv) I : Direction remains constant and value of current remains same. 1
I I : In case of a.c. both the value as well as the direction of the current changes. 1
SECTION B
17. Aerobic respiration/accumulation of lactic acid/non availability of oxygen. 1
18. Pancreas
Trypsin / Lipase / Amylase 1
19. Sulphur dioxide and Nitric oxide 1
20. The solar cooker with the glass slab; as the heat gets trapped within the cooker and
the temperature of the cooker rise. It rises more than the uncovered cooker / Green
house effect. 2
21. 1 - light energy.
2 - chemical energy. 2
22. (i) gorilla, fish, cockroach, mangotree.
(ii) gorilla 2
23. Snake :
Snake is a secondary consumer while hawk is a tertiary consumer. At each trophic
level some energy is lost to the environment. Hawk is at the 4th trophic level and
the snake is at the 3rd trophic level, so more energy will be available to the snake.
24. (i) xylem - water and minerals
(ii) phloem - sugar
(iii) pulmonary vein - Oxygenated blood 2
(iv) Vena Cava - Deoxygenated blood
25. Fossil.
315
All preserved traces of living organisms are called fossils. The studies of extinct
species show the evidence of evolution. 3
26. (i) The nonrenewable resources are limited, so we should use them judiciously.
(ii) We should encourage the use of renewable resources.
(iii) Preserve the environment for future generations.
(iv) The benefits of the controlled exploitation should go to the local people
(any three) 3
27. (i) monohybrid cross.
(ii) red colour of flower dominant over white flower
(iii) RR, rr (b) Rr (c) RR, Rr and rr 5
OR
(i) herbivore
(ii) primary consumers
(iii) 10%
(iv) soil and sunlight
(v) solar energy. 5
316
X SCIENCE (THEORY)
BLUE PRINT II
VSA SA - I SA - II LA Total
Unit (1 Mark) (2 Marks) (3 Marks) (5 Marks)
Chemical Substances 3(3) 4(2) 6(2) 5(1) 18(8)
World of Living 2(2) 6(3) 3(1) 5(1) 16(7)
Effects of current 1(1) 4(2) - 5(1) 10(4)
Light 2(2) - 6(2) - 8(4)
Natural Resources 1(1) 4(2) 3(1) - 8(4)
Total 9(9) 18(9) 18(6) 15(3) 60(27)
Form of
Questions
317
SAMPLE QUESTION PAPER II
X - SCIENCE (Theory)
Time : 2½ Hours Max. Marks : 60
General Instructions
1. The question paper comprises of two sections A and B. You are to attempt both the sections.
2. All questions are compulsory.
3. There is no overall choice However, internal choice has been provided in all the three
questions of five marks category. Only one option in such questions is to be attempted.
4. All questions of section A and all questions of section B are to be attempted separately.
5. Questions 1 to 6 in section A and 17 to 19 in section B are short answer questions. These
carry one mark each.
6. Questions 7 to 10 in section A and 20 to 24 in section B are short answer type questions
and carry two marks each.
7. Questions 11 to 14 in section A and 25 to 26 in section B are also short answer type
questions and carry three marks each.
8. Questions 15 and 16 in section A and question 27 in section B are long answer type
questions and carry five marks each.
SECTION A
1. A ray of light AM is incident on a spherical mirror as shown in the diagram.
Redraw the diagram on the answer sheet and show the path of reflected ray. Also indicate
and mark the angle of reflection in the diagram.
2. A metal M forms an oxide having the formula M2 O3. It belongs to 3rd period in the modern
periodic table. Write the atomic number and valency of the metal.
3. The ciliary muscles of a normal eye are in their (i) most relaxed (ii) most contracted state.
In which of the two cases is the focal length of the eye-lens more?
318
4. Tap water conducts electricity whereas distilled water does not. Why?
5. An electric geyser has the ratings 2000W, 220V marked on it. What should be the minimum
rating, in whole number of a fuse wire, that may be required for safe use with this geyser?
6. An organic compound burns with a sooty flame. Is it a saturated or an un saturated
compound?
7. Two metallic wires A and B of the same material are connected in parallel. Wire A has
length l and radius r, wire B has a length 2 l and radius 2r. Compute the ratio of the total
resistance of parallel combination and the resistance of wire A.
8. A student performs an experiment to study the magnetic effect of current around a current
carrying straight conductor. He reports that
(i) the direction of deflection of the north pole of a compass needle kept at a given point
near the conductor remains unaffected even when the terminals of the battery sending
current in the wire are inter changed.
(ii) for a given battery, the degree of deflection of a N-pole decreases when the compass
is kept at a point farther away from the conductor.
Which of the above observations of the student is incorrect and why?
9. A housewife wanted her house to be whitewashed. She bought 10kg of quick lime from
the market and dissolved it in 30 litres of water. On adding lime to water she noticed that
the water started boiling even when it was not being heated. Give reason for her
observation. Write the corresponding chemical equation and name the product formed.
10. Write the electron - dot structure for sodium and chlorine atoms. How do these form a
chemical bond? Name the type of bond so formed. Why does a compond so formed have
high melting point?
11. Two carbon compounds A and B have the molecular formula C3 H8 and C3 H6 respectively.
Which one of the two is most likely to show addition reaction? Justify your answer. Explain
with the help of a chemical equation, how an addition reaction is useful in vegetable ghee
industry.
12. A beam of white light falling on a glass prism gets split up into seven colours marked 1 to
7 as shown in the diagram.
A student makes the following statements about the spectrum observed
on the screen.
a) The colours at positions marked 3 and 5 are similar
to the colour of the sky and the core of a hard boiled
egg respectively.
Is the above statement made by the student correct
or incorrect? Justify.
b) Which two positions correspond closely to the
colour of
319
(i) a solution of potassium permanganate?
(ii) ‘danger' or stop signal lights?
13. Baking soda is used in small amount in making bread and cake. It helps to make these
soft and spongy. An aqueous solution of baking soda turns red litmus blue. It is also used
in soda acid fire extinguisher.
Use this information to answer the following questions:
(i) How does Baking Soda help to make cakes and bread soft and spongy?
(ii) How does it help in extinguishing fire?
(iii) is the pH value of baking soda solution lesser than or greater than 7?
14. A concave mirror produces three times enlarged image of an object placed at 10 cm
infront of it. Calculate the radius of curvature of the mirror.
15. a) What were the two major shortcomings of Mendeleev's periodic table? How have
these been removed in the modern periodic table?
b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the
electronic configuration for these elements. To which period of the modern periodic
table do these two elements belong? What type of bond will be formed between
them and why?
OR
a) What were the two achievements of Mendeleev's Periodic table? What was the
basis of classification of elements in it ?
b) An element X (2,8,2) combines separately with NO3 and (SO4)2 -, (PO4)3 - radicals.
Write the formulae of the three compounds so formed. To which group of the periodic
table does the element ‘X' belong? Will it form covalent or ionic compound? Why?
16. a) The electric power consumed by a device may be calculated by using either of the
two expressions P = I2R or P = V 2. The first expression indicates that it is directly
R
proportional to R whereas the second expression indicates inverse proportionality.
How can the seemingly different dependence of P on R in these expressions be
explained?
b) Explain the following:
(i) Why is tungsten used almost exclusively for filament of electric lamps?
(ii) Why are copper and aluminium wires usually used for electricity transmission?
OR
Explain the meaning of the word ‘electromagnetic' and ‘induction' in the term
electromagnetic induction. On what factors does the value of induced current produced in
a circuit depend? Name and state the rule used for determination of direction of induced
current. State one practical application of this phenomenon in everyday life.
Section B
17. From the list given below, pick out the items which can be recycled:-
Used clothes, polythene carry bags, glass bottles, newspaper 1
320
18. What does the given experimental
set-up domonstrate? 1
19. A particular hormone requires lodine for its synthesis. Name the endocrine gland which
secretes this hormone and state its location in the human body. 1
20. Why are many thermal power plants set up near coal or oilfields? 2
21. Name those parts of the flower which serve the same function as the following do in the
animals:-
(i) testis (ii) ovary (iii) eggs (iv) sperms
2
22. A graph was plotted to show the energy output of two types of
respiration. Identify the types of respiration denoted by curves A
and B. 2
23. How did the ‘Chipko andolan' ultimately benefit the local population?
Give any two benefits. 2
24.
(i) Label the two parts indicated by question marks and labelled 1 and 2 in the above
diagram.
(ii) Suggest a suitable caption or heading for the above diagram. 2
?
?
321
25. Write the number given to any six of the organisms shown in Figure B against their
relevent Trophic levels given in figure given below. 3
26. The genotype of green stemmed tomato plants is denoted as GG and that of purplestemmed
tomato plants as gg. When these two are crossed,
(i) What colour of stem would you expect in their F1 progeny?
(ii) Give the percentage of purple-stemmed plants if F1 plants are self pollinated.
(iii) In what ratio would you find the genotypes GG and Gg in the F2 progeny? 3
27. (i) Draw the diagram of heart and label its four chambers
(ii) Construct a table to show the functions of these four chambers. 5
OR
Plants absorb water from the soil. How does this water reach the tree tops? Explain in
detail
322
MARKING SCHEME
SAMPLE QUESTION PAPER II
X SCIENCE (THEORY)
Q.No. Value Point Marks
1. 1
2. The atomic number of the metal is 13. The valency of the metal is 3. 1
3. In the first case 1
4. Tap water contains dissolved salts and minerals which ionise in water and hence conducts
electricity. Distilled water is a covalent compound so it does not conduct electricity. 1
5. 10 A 1
6. Unsaturated 1
7.
½
1
½
8. ?? Observation (i) is incorrect. 1
?? When the direction of flow of current is changed, the direction of the magnetic field
and hence the direction of force also changes. 1
9. The reaction of lime with water is an exothermic reaction in which lot of heat is evolved. 1
323
CaO + H2O — Ca (OH)2
Ca(OH)2 is called slaked lime or calcium hydroxide 2
10. Na ½
Sodium atom loses one electron to attain octet configuration and forms sodium ion.
Chlorine atom has 7 electrons in the outermost shell, so it gains the electron lost by the
sodium ion to form the chloride ion. The two oppositely charged ions are held together by
strong electrostatic force of attraction to form the ionic bond. 1
½
Ionic compounds have high melting points because a considerable amount of energy is
required to break the strong inter ionic attraction. 2
11. C3 H6 will show addition reaction C3 H6 is an unsaturated compound with a double bond.
Vegetable oils have long unsaturated carbon chains which on addition of hydrogen in the
presence of catalyst nickel, change into saturated carbon chains. This is called
hydrogenation of oils. 2
1
12. (a) Incorrect. The student is stating the nature of colours in reverse order.
(b) (i) Colour marked 7
(ii) Colour marked 1
13. (i) On heating, baking soda gives out CO2 which makes cakes and bread rise up, so
they become soft and spongy. 1
(ii) CO2 being heavier than air settles down and forms a layer between the burning
substance and the air, thus cutting off the supply of oxygen. 1
(iii) Its pH value is greater than 7. 1
14. ½
½
1
324
radius of curvature of the min = 15cm
15 (a) The major short comings of Mendeleev's periodic table were.
(i) wrong order of atomic masses.
(ii) Position of hydrogen.
(iii) Position of isotopes. (any two)
?? In the modern periodic table, the elements are arranged in the increasing order of
their atomic numbers instead of atomic masses.
(b) Atomic number
X, Z = 12, 2, 8, 2
Y, Z = 16 2, 8, 6
They belong to the third period.
They will form ionic bond because X is a metal and Y is a non-metal. X loses 2
electrons which will be gained by Y. 5
OR
(a) Atomic mass was the basis of classification of elements in Mendeleev's periodic
table.
Period means - a periodic reoccurrence of physical and chemical properties.
(b) X3 (PO4)2
X (NO3)2
X SO4.
X belongs to Group II in the periodic table.
It will form ionic compounds because it will readily lose 2 electrons.
16. (a) Both the expressions are correct. In the first case, I remains constant whereas the
second expression is true when V remains constant. 2
(b) (i) Melting point of tungsten is very high 1
(ii) ?? Specific Resistance is low
?? comparatively light in weight 2
OR
(i) Meaning of the terms 1
(ii) Rate of change of magnetic flux 1
(iii) Fleming's Right Hand Rule 1
(iv) Statement of the Rule 1
(v) Electric Generator 1
SECTION B
17. Polythene carry bags, newspapers 1
18. Phototropism the shoot of the plant bends towards light 1
19. Thyroid gland; neck region 1
325
20. Coal or petroleum is required to heat water to produce steam for running the turbines in
thermal plants. Cost of transportation is reduced if the thermal plants are near coal / oil
fields. 2
21. (i) Stamen / anther / androecium
(ii) ovary
(iii) ovules
(iv) pollen grains / pollen
22. A - Anaerobic
B - Aerobic
23. (i) The locals benefited from the forest produce.
(ii) The wildlife and nature were conserved. (any two)
(iii) The quality of air and soil was preserved. 2
24. (i) Spinal cord
(ii) effector = muscle in the arm.
(iii) Reflex action / Reflex arc. 2
25. Producers - 1 and 8
Primary consumers - 2, 5 and 7. (any two)
Secondary consumer - 3, 6
Tertiary consumer - 4 3
26. (i) green stemmed
(ii) 25%
(iii) GG - 1 3
Gg - 2 or GG : Gg = 1:2
27. Diagram with correct labelling 3
Table to show heart and functions.
Chambers of the heart Functions
Right Atrium Receives deoxygenated blood.
Right Ventricle Sends deoxygenated blood.
Left Atrium Sends deoxygenated blood to the lungs.
Left Ventricle Sends oxygenated blood to aorta for transporting to
the body
2
OR
Xylem (vessels) of roots, stems and leaves are interconnected to form a continuous column.
Roots also take up mineral salts actively, water moves in as a result creating pressure.
The root pressure pushes the water up. Stomatal transpiration creates suction force pulling
up the water from root xylem / transpiration pull. 5
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