Study the structure above and answer the questions below :

(a) Which of the parts labelled form the crown? 

ans:

(b) Identify the parts labelled 1 to 

Study the structure carefully and answer the questions that follow :

a) Identify the structure.

ans: A flower

b) State one function each of stigma, anther, petal and sepal.

ans: *Stigma-It receives pollen grains during pollination.

*Anther-It produces or contains the pollen grains.

*Petal-It attracts insects and birds for pollination.

*Sepal-It protects the flower at the bud stage.

c) What is the collective name given to the anther and filament?

ans: Stamen

d) What is the collective name given to stigma, style, ovary and ovule?

ans: Pistil or carpel

e) State two changes that occur in a flower after fertilization.

ans: 1. Ovules become the seed.

         2. Ovary become the fruit.

#READY_4_EXAMS

Study the living organisms illustrated and answer the questions that follow :

a) Identify each of the living organisms labelled A, B, C, D, E and F.

ans: A-Tick

         B-Caterpillar

         C-Mouse/Rat

         D-Louse

         E-Weevil

         F-Tsetsefly

b) Which of the organisms are pests?

ans: Organisms C, B and E.

c) Which of the organisms are parasites?

ans: Organisms A, D and F.

d) List four crops which are attacked by the organisms named in (b) above.

ans: Yam, cassava, rice, maize, groundnut, tomatoes, etc.

e) State one effect each of organism A and D on living organisms.

ans: A-It sucks blood from dogs, sheep, etc

D-It sucks blood from humans leading to anaemia.

f) State three methods of controlling organism C.

ans: 1. Weed control.

     2. Early harvesting.

     3. Application of recommended pesticides.

     4. Setting traps.

     5. Proper fencing.

#READY_4_EXAMS

The table represents the first 20 elements of the periodic table.

a) By what principle are elements arranged on the periodic table?

ans: According to their increasing atomic numbers.

b) Which group on the periodic table represents metals?

ans: Group 1-3

c) Which group on the periodic table represents non-metals?

ans: Group 4-8

d) Which group represents the most reactive metals?

ans: Group 1

e) Which group represents the most reactive non-metals?

ans: Group 7

f) Name the two elements on the periodic table that are metalloids.

ans: Boron and Silicon

g) Name the most reactive metal on the periodic table.

ans: Potassium

h) Name two elements on the periodic table that belong to group 5.

ans: Nitrogen and Phosphorus

I) Name two elements on the periodic table that belong to period 3.

ans: Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulphur, Chlorine, Argon.

j) List any two alkali metals from the table.

ans: Lithium, Sodium, Potassium.

#READY_4_EXAMS

Study the organism illustrated carefully and answer the questions that follow :

a) Identify the organism illustrated.

ans: Weevil

b) State whether the organism is a pest or parasite.

ans: Pest

c) Name two food crops that are mostly attacked by the organism.

ans: Maize, rice, beans, etc.

d) Name three other examples of the answer given in (b) above.

ans: Caterpillar, Rat, Squirrel, etc.

e) State two effects of the organism on crops.

ans: 1. It reduces crop yield.

         2. It exposes crops to diseases.

#READY_4_EXAMS

The diagram illustrates a hazard symbol. Study it carefully and answer the questions that follow :

a) What does the symbol represent?

ans: Highly flammable

b) Name two substances that is associated with the symbol.

ans: Petrol, LPG, ethanol(alcohol), gasoline, etc.

c) Name a place where the hazard symbol is often displayed.

ans: LPG station, Petrol filling station.

d) What type of safety sign is the diagram?

ans: Warning safety sign

e) Name two safety devices that can be used to control the hazard symbol.

ans: Fire extinguisher, fire alarm, fire blanket, sand bucket, etc.

f) What colour is represented by parts labelled I, II and III?

ans: I-Black

        II-Yellow

        III-Black

#READY_4_EXAMS

Study the diagram carefully and answer the questions that follow :

a) Identify the above set-up.

ans: Pinhole camera

b) Label the parts I, II, III and IV.

ans: I-Object

        II-Pinhole

        III-Screen

        IV-Image

c) State two characteristics of images formed by the set-up.

ans: 1. It is real.

         2. It is inverted.

         3. It is diminished.

d) Explain why the part labelled IV is inverted?

ans: Because light rays traveling in straight lines from the top and bottom of I intersect at II.

e) Name two materials that can be used to construct the set-up.

ans: Cardboard, frosted glass.

#READY_4_EXAMS

The diagram shows the set-up used to separate a mixture. Study it carefully and answer the questions below :

a) What method of separation is used in the set-up?

ans: Separating funnel method

b) Name the two apparatus used in the set-up.

ans: Separating funnel, retort stand and clamp.

c) State the physical property of the components of the mixture that makes thier separation possible.

ans: Density

d) What name is given to the type of mixture being separated?

ans: Immiscible liquid mixture.

e) Name one other example of a mixture that could be separated by the set-up.

ans: Kerosene and water.

#READY_4_EXAMS

The diagram illustrated shows the life cycle of a living organism.

a) What life cycle does the diagram represent?

ans: The life cycle of a mosquito.

b) Name the parts of the cycle labelled I, II, III and IV.

ans: I-Egg

        II-Larva

        III-Pupa

        IV-Adult mosquito

c) Name four methods that can be used to control part IV.

ans: 1. Environmental method

         2. Chemical method

         3. Biological method

         4. Genetic method

d) Mention two places where the cycle is likely to be found.

ans: Stagnant pool of water, empty cans, choked gutters, etc

e) Name the parasite transmitted by part labelled IV.

ans: Plasmodium

f) Name the three common groups of part labelled IV.

ans: Added, Culex, Anopheles.

g) How many days does the cycle above lasts?

ans: 28 days

Study the circuit diagram and answer the questions that follow :

(a) Name the components X, Y and Z.

ans: X-Rheostat

         Y-Voltmeter

         Z-Ammeter

(b) What effect would a reduction in the number of cells have on:

    i) the current in the circuit.

    ii) the voltage.

ans: i) The current of the circuit would reduce.

        ii) The voltage would reduce.

(c) State two changes in the circuit that would increase the brightness of the lamp.

ans: 1. By increasing the number of cells.

         2. By decreasing the resistance of the variable resistor.

(d) Calculate the total emf of the cells if each is 2.0V.

ans: Total emf= E1 + E2 + E3

                          = 2.0 +2.0 + 2.0

                          = 6V

(e) State the function of the switch in the circuit.

ans: It is used to open and close the circuit.

The diagram above is an illustration of a sample of garden soil put in a cylinder containing water. It was shaken and allowed to settle.

(a) State the aim of the experimental set-up.

ANS: To show that soil is made up of different sized particles.

(b) Name the parts labelled A, B, C, D and E.

ANS: A-Clay suspension

          B-Clay

          C-Silt

          D-Sand

          E-Gravel

(c) Mention the physical property of the soil that could be determined from the experiment.

ANS: Soil texture

(d) Outline three importance of humus in crop production.

ANS: 1. It improves soil structure.

          2. It improves soil fertility.

          3. It improves soil aeration.

(e) What conclusion could be drawn from the experiment?

ANS:

Soil is made up of different sized particles.

The diagram represents a simple machine. Use it to answer the questions below if the load is 20N and the effort is 25N.

(a) Identify and define the load, pivot and effort.

ANS: I-load; it is the force that the effort overcomes

II-pivot; it is the turning point of a lever

III-effort; it is the force applied to the machine

(b) Which class of simple machine is illustrated?

ANS: First Class lever

(c) If the load distance is 0.024m and the effort distance is 0.039m, calculate

      (i)  Mechanical advantage

      (ii) Velocity ratio

      (iii) Efficiency of the machine

ANS: i) M. A=load ÷effort

                      =20N÷25N

                      =0.8

          ii) V. R=effort dist.÷load dist.

                     =0.039÷0.024

                     =1.625

          iii) Efficiency =(M. A/V.R)×100

                                  =(0.8÷1.625)×100

                                  =49.23%

Study the diagram which shows an aspect of photosynthesis and answer the questions below:

a) State the aim of the experiment.

ANS: To show that starch is present in green leaves.

b) Give the function of the ethanol in the experiment.

ANS: To remove the chlorophyll from the leaf.

c) State one reason why the green leaf should be boiled in water first.

ANS: To kill the cells of the leaf

d) Mention two reasons why the green leaf after being removed from the ethanol should be washed with warm water.

ANS: 1. To wash away the ethanol

          2. To soften the leaf

e) Why is the leaf not heated directly on the Bunsen burner?

ANS: Because ethanol easily catches fire

f) What observation would be made when the leaf is finally tested with iodine solution?

ANS: The leaf turns blue black

The diagrams shows the reproductive systems of human. Study them carefully and answer the questions below:

a) Identify each of the systems labelled X and Y.

ANS: X-Female reproductive system

          Y-Male reproductive system

b) Name the part of X where fertilization occurs.

ANS: Fallopian tube

c) Name the part of Y that produces sperm.

ANS: Testes

d) Which diagram does the following part belong :

   (I) ovary, cervix and uterus

   (II) urethra, epididymis and scrotum

ANS: (I) diagram X

          (II) diagram Y