KCSE Biology Paper 1 2013 PDF: Free Past Papers

KCSE Biology Paper 1 2013 PDF: If You are among the Candidates that will be writing Biology in the upcoming KCSE exams this year, review the past paper 2, It is very helpful. After a successful download of the PDF of KCSE Biology Past Paper 1 for 2013, start practicing the KCSE Biology Paper 1 2013 consistently to see good results.

KCSE Biology Paper 1 2013 PDF: Free KNEC Past Papers

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There are KCSE Biology past Papers that will prepare You for the upcoming KCSE exams 2020, We believe that KCSE Biology questions and answers are worth It when it comes to revision for KCSE examinations. You must know that there are no new questions, it’s just a repetition of already-set Biology questions but in a different tricky form.

KCSE Biology PAPER 1 2013 with Answers

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Kenya Certificate of Secondary Education Biology Past Paper 

KCSE Biology Paper 1 2013

Biology KCSE 2013 Questions and Answers

BIO paper 1

1 (a) What is meant by the term wilting? (1 mark)

(b) Explain how an increase in temperature affects the rate of active transport.

2 The diBIOam below represents a cell as seen under an electron microscope.

(a) Based on the diBIOam, state whether it represents an animal cell or a plant cell.

(b) Give two reasons for your answer in 2(a) above. (2 marks)

(c) Why is the palisade layer a tissue? (1 mark)

(3)(a) State two external features found in the class Mammalia only. (2 marks)

(b) Name the taxonomic unit that comes immediately after a phylum in classification. (1 mark)

(4)(a) State two roles of mucus in the stomach. ‘ (2 marks)

(b) Explain how age determines a person’s energy requirements. (2 marks)

(5)(a)Describe how turgor pressure builds up. (3 marks)

(6)Using a microscope, a student counted S5 cells a cross a field of view whose diameter was 6000;4m. Calculate the average length of the cells. Show your working. (2 marks)

(7) Explain how the following forces contribute to the movement of water up the xylem vessels: (2 marks)

(a) cohesion;

(b) adhesion.

(8) Construct a step in a dichotomous key using twoleaves one with a serrated and the other with a smooth margin. (2 marks)

(9) State one way in which each of the following is structurally adapted to its function:

(a) neurone; (2 marks)

(b) mitochondrion. (2 marks)

(10) How are lenticels adapted for gaseous exchange? (2 marks)

(11)State the advantage of possessing blood group AB. (1 mark)

(12)(a) A student collected an organism and observed the following features: simple eyes.

(b)four pairs of legs and two body parts.

(13) State the class to which the organism belongs. (1 mark)

(14) Give an example of an organism in this class. (1 mark)

(15) Name the kingdom to which plasmodium belongs. (1 mark)

(16)State two characteristics of living organisms that are specific to plants. (2 marks)

(17)Name the three end products of anaerobic respiration in plants. (3 marks)

(18)State two reasons why accumulation of lactic acid leads to an increase in heart beat. (2 marks)

(19)Name three mechanisms that ensure cross pollination takes place in flowering plants. (3 marks)

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(20)Name the flower part that produces gametes. (1 mark)

(21)(a)How is the human sperm cell structurally specialised? (2 marks)

(b)State three factors in seeds that cause dormancy. (3 marks)

(21)Explain the theory of evolution by natural selection. (2 marks)

(a) Explain the role of continental drift in evolution. (3 marks)

(b) What is meant by the term organic evolution? (1 mark)

(22)The diBIOam below illustrates a response by a certain plant.

(a)Name the type of response.

(b)Explain how the response illustrated above occurs.

23 The diBIOam below illustrates a defect in the eye.

(i)Explain how the defect illustrated above can be corrected.

24 Explain three protective functions of mammalian blood.

25 State one adaptation of xylem vessels to their function.

26 (a)What is meant by the term sex linked genes?

(b) Name two sex linked traits in human beings.

27(a) State two differences between complete and incomplete metamorphosis.

(b)State the importance of moulting to an insect

28(a) State two features of a ball and socket joint.

(b) Name the bone that allows the head to:

(i) nod; ………….. ..

(ii) turn side ways

29 State two functions of pelvic girdle in mammals.

30 State two ways in which osmosis is significant to plants.

KCSE Biology Paper 1 2013 Questions and Answers

KCSE Biology Marking scheme Paper 1 – BIO paper 1

SECTION A (40 marks)

Answer all the questions in this section in the spaces provided

1 (a) The diBIOam below represents a plant in the division Bryophyta.

(i) Name the parts labelled B and D. (2 marks)

B …………………………………………………………………………………………………………….. .. D ………………………………………………………… ..

(ii) State one function for each of the parts labelled A and C. (2 marks)

A …………………………………………………………………………. ..

C …………………………………………………………………………………………………………….. ..

(b) The diBIOam below represents a member of the kingdom Animalia.

(i) Name the phylum to which the organism belongs. ( 1 mark)

(ii) Using observable features in the diBIOam, give three reasons for the answer in b(i). V (3 marks)

2.The diBIOam below represents the human ear.

(a) Name the parts labelled E, F and G.

E …………………….. ..

F …………………….. ..

G …………………….. ..

(b) How is each of the following adapted to its function?

(i) External auditory meatus;

(ii) Ear ossicles.

(c) Name one defect of the human ear.

3.(a) Explain the importance of the following in photosynthesis:

(i) light;

(ii) carbon(lV) oxide;

(iii) chlorophyll.

(b) Name one appropriate food substance for each of the following enzymes:

(i) ptylin ….. ..

(ii) pepsin …… ..

(c) State the cause and two symptoms of Beri-beri.

Cause ……………… ..

Symptoms (2 marks)

(i) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.. (ii) ………………………………………………………………………………………………………………… ..

4.ln an investigation, a variety of pea plants grown from seeds with smooth coats were crossed with plants grown from seeds with wrinkled coats. All the seeds obtained in the first filial (F I) generation had smooth seed coats.

(a) Using the letter R to represent the gene for smooth seed coat, ‘work out the genotype of the Fl generation. Show your working. (3 marks)

(b) l f the Fl generation was selfed, detennine the phenotypic ratio of the second filial (F2) generation. Show your working. (3 marks)

(c) If the total number of seeds in the F2 generation was 14 640, calculate the number of seeds with wrinkled coats. Show your working. (2 marks)

5.The diBIOam below represents a mammalian pelvic girdle.

(a) How are the structures labelled H and J adapted to their function?

(i) H (2 marks)

(ii) J (2 marks)

(b) State the function of obturator foramen. ( l mark)

(c) (i) Name the bone that articulates with the pelvic girdle at acetabulum. (1 mark)

(ii) Name the type of joint formed by the acetabulum and the bone named in (c)(i) above. (I mark)

(d) Name the bone fonned by the fusion of caudal vertebrae in human beings. (l mark) 125

SECTION B (40 marks)

Answer question 6 (compulsory) and either question 7 or 8 in the spaces provided after question 8.

6.A scientist carried out an investigation to find out the population growth of mice under laboratory conditions. Twenty young mice were placed in a cage. The results obtained from the investigation were as shown in the table below.

(a) On the grid provided, draw a graph of the number of mice against time. (6 marks)

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(b) Account for the changes in mice population between

(i) 0 to 2 months (2 marks)

(ii) 2 to 6 months (2 marks)

(m) 6 to I0 months (2 marks)

(iv) I0 to 12 months. (2 marks)

(c) (i) Between which two months was the population change greatest? (1 mark)

(ii) Calculate the rate of population change over the period in (c)(i) above. (2 marks)

(d) What change in population would be expected if the investigation was continued to the 19th month? (l mark)

(e) To obtain the observed results state twovariables that were kept constant during the investigation. _

7(a) Describe the process of blood clotting in human beings.

(b) How are respiratory surfaces in mammals adapted to their functions?

ii Describe the role of the following organs in excretion and homeostasis.

(a) the liver

(b) the skin during hot environmental conditions.

Biology Paper 3 (231/3)

1.(a) The photograph below shows the inner surface of the upper lefi side of the rib cage.

(i) Name the bone covered by the fatty tissue labelled K. (l mark)

(ii) Explain the role of the part labelled M in inhalation. (5 marks)

(b) The photograph below shows a mammalian vertebra.

(i) State the view of the vertebra presented. (1 mark)

(ii) Name and state one function of the part labelled T.

Name

…………………………………………………………………………………………………… .. (1 mark)

Function

………………………………………………………………………………….. .. (1 mark)

(iii) How are the parts labelled S and V adapted to their functions? (4 marks)

S ………………………

V ………………………

c) The actual width of the vertebra below in cm is shown by a section of the ruler in the photograph.

(i) Determine the width of the vertebra on the photograph. ( l mark)

(ii) Calculate the magnification of this image. (2 marks)

(iii) Determine the actual length of the vetebra from point A to B. Show your working. (2 marks)

2You are provided with a food sample labelled solution C. Using the reagents provided, carry out tests to identify the food substances present in the sample.

TEST FOR PROCEDURE OBSERVATION CONCLUSION l. Reducing sugars

2. Non- reducing sugars

3. Proteins

Below are photographs showing some observebal features of leaves. (12 marks)

Using the features in the order given below, construct a dichotomous key that can be used to identify the specimens.

 

  • simple or compound leaves;
  • leaf venation;
  • leaf margin;
  • arrangement of leaves on the stem;
  • pinnate or trifoliate nature of leaves. (10 marks)

 

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KCSE Biology Paper 2 2013

->> Click Here to download Biology KCSE Paper 2 2013 PDF

KCSE Biology Paper 3 2013

->> Here are the KCSE Biology Paper 3 2013 exams that are available

Question 1

PART A

You are provided with the following:

a metre rule

3 optical pins

2 small wooden blocks

a stop watch

a stand, a boss and clamp

a piece of sellotape

Proceed as follows:

a) Using the two wooden blocks, clamp two optical pins about 4 cm apart in the stand so that they project out of the blocks in a horizontal plane.

(b) Using a piece of sellotape, attach the third optical pin across the metre rule at a distance x = 1O cm from the 50 cm mark. Now suspend the metre rule on the two clamped pins so that it can swing freely in a vertical plan with the third pin as the axis. (See figure 1)

(c) Displace the lower end of the metre rule slightly and let it oscillate as shown in the figure 1.

Measure and record in table l the time t(s) for 20 oscillations. (Correct to one decimal place).

(d) (i) Repeat the procedure in (b) and (c) for the values of X shown in table 1.

(ii) For each value of x shown in the table, determine the period T(s), correct to two decimal places, and complete the table. (The period T is the time for one complete oscillation).

(e) On the grid provided, plot a graph of T2X(y-axis) against X2 (origin not required). (5 marks)

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(f) From the graph, determine:

(i) the slope S of the graph. (3 marks)

(ii) the value of constant r given that:

rS = 39.5 (2 marks)

PART B

You are provided with the following:

– a converging mirror

– a rectangular piece of manilla paper

– a half meter rule

– a stand, boss and clamp

– a dropper

– liquid Q

Proceed as follows:

(g) (i) Using the wooden blocks clamp the manilla paper in the stand so that it projects out of the blocks in a horizontal plane, about 30 cm above the bench.

(ii) Place the mirror on the bench so that its centre is vertically below the free end of the manilla paper.

(h) With your eye vertically above the free end of the manilla, observe its inverted diminished image appearing as in figure 2.

(i) Now adjust the height of the manilla vertically above the centre of the mirror until its width and that of the inverted image are equal as in figure 3.

Measure and record the distance L1 between the manilla paper and the bench. L1 = …………………….. ..cm (1 mark)

(j) Using the dropper provided put some liquid Q on the mirror so that its surface is about 3 cm in diameter. Repeat part (i). Measure and record the distance L2 between the manilla paper and the bench. L2 : ……..cm (1 mark)

(k) Determine constant k given that:

L1 = kL2 (2 marks)

Question 2

You are provided with the following:

four 10 Q resistors

a resistance wire labelled S mounted on a half metre rule

a resistance wire AB mounted on a metre rule

two dry cells and a cell holder

a centre zero galvanometer G

8 connecting wires each with a crocodile clip at one end

a jockey

a micrometer screw gauge

a switch

(a) Set up the circuit as in figure 4 in which R is nearA and S is near B. (R is a 10 Q resistor or an appropriate combination of 10-ohm resistors).

(b) Starting with a single 10 Q resistor as R, close the switch. Using the jockey tap wire AB briefly near end A and observe the deflection on the galvanometer. Now tap the wire near end B and again observe the deflection of the galvanometer. (The two deflections should be in opposite directions)

(c) Still with the 10 Q resistor as R, tap at various points along wire AB to obtain a point P at which the galvanometer shows zero deflection. Measure and record in table 2 the length L (m) between A and P. (Record L correct to 3 decimal places)

(d) Repeat part (c) to obtain L for other values of R shown in table 2. (6 marks)

Determine:

(i) 1/L for all the values of L correct to 2 decimal places. (1 mark)

(ii) 1/R for all values of R correct to 3 decimal places. (1 mark)

On the grid provided, plot a graph of 1/L (y-axis) against 1/R (origin not required). (5 marks)

(i) Determine the slope n of the graph. (3 marks)

(ii) State the unit of n. (1 mark)

Using the micrometer screw gauge, measure and record the diameter D of wire S in metres. D : …………………………. .. m. (1 mark)

Determine the value of constant k given that 4k=rnD2n(3 marks)

You can access the marking shemes via the paper 2 page for this subject, go to the page via the link above with the description  “Click Here to download Biology KCSE Paper 2 2013 PDF” and scroll down and You will see the 2013 Marking schemes already provided.

After a successful purchase of the past Papers It is time for revision. Put in your best and get the best out of your KCSE Exams.

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