Question Library

The statements below are about evolution of species I. Members of a species vary ll. Organisms produce many offspring lll. The mechanism of evolution is inheritance of acquired characters IV. Changes in the phenotype is brought about by the individual itself Which of the statement(s) is/are related to the Darwin’s theory of evolution?

Which of the following fields of study may not yield strong evidence of evolution?

1. (a) Name the organism illustrated in the diagram above (b) Name the structure labelled A. 2. List (a) two air pollutants (b) Three water pollutants. Study the diagram below and use it to answer question 3 3. (a) Name the structure illustrated above (b) Name the parts labelled A- D (c) State the function of the part labelled C (d) in which group of animals is this structure found? 4. State the basic structure of a virus. Study the diagram below and use it to answer question 5 Study the diagram below and use it to answer question 5 5. (a) Name the organism illustrated in the diagram above (b) Name the parts labelled A to D (c) What is the habitat of the organism? What are the functions of A and D? The diagram below represents an instrument used in an ecological study. Use it to answer question 6 6. (a) VWhat is the name of the instrument? (b) What is the instrument used for? (c) What is the function of the part labelled A? (d) Name the parts labelled B and C. 7. A food substance was put in two test tubes labeilcd I and Il in test tube , Fehling's solutions A and B were added and the mixture warmed. A negative result was obtained. In test tube Il dilute hydrochloric acid was added and the mixture was boiled, after which few drops of sodium hyddroxide were added. Then Fehling's solutions A and B were added. A positive result was obtained in test tube H after warming (a) What colour should indicate a positive result in test tube lI? (b) What food substance must have given the positive result in test tube l1? (c) What role did dilute hydrochloric acid play in the test? (d) Why was sodium hydroxide added to test tube l1? (e) Why was a negative result obtained in test tube 1? (f) Suggest the food substance in the original samples tested SECTION B Answer all the questions in this section 8. (a) ldentify specimens A and B without reason (b) State the agricultural classification of each of specimen A and B based on their uses. (c) Name one pest each that is likely to have put the specimens A and B in the condition they are (d) Name two ways of preventing the activity of the named pests during storage (e) Give one possible disadvantage of the named control measure of the pest during storage (f) Describe how you can test for the presence of protein in specimen A (g) Carry out a test to show the presence of starch in specimen B with the reagent provided. Record your procedure and result following the pattern given below 9.Examine specimen C carefully (a) Copy the table below in your answer book. Complete the table using your observations on specimen C Test Observation Inference (b) Name of floral parts Number of floral parts Colour of floral parts Sepal Petal Filament Stigma b) Carefully detach the other petals except the special petal. Make a large labeled drawing (10-12 cm long) of the remaining floral parts. 0. The variation of length of leaves of a certain plant species was studied in order to illustrate the frequency distribution of the lengths. The leaves were sorted out into the following ranges of lengths: (a) Using the data. draw a histogram to show the frequency of leaves of different lenghts. Place thee range of lengths on the horizontal axis and the number of leaves/frequency on the vertical axis (b) How many leaves were collected during the study? (c) if the leaves were collected from different plants,give two possible causes of the differences in length. Range of length (in mm) Number of leaves / frequency 21-24 3 24-27 30 27-30 66 30-33 40 33-36 10 36-39 20 39- 42 38 42-45 58 45-48 33 48-51 16 51-54 2 54-57 1

(a) State two advantages of complex structural organisation in higher organisms. (b) (i) List two differences between colonial organisms and filamentous organisms. (ii) Give one example each of a colonial organisms and a eke filamentous (c) Make a labelled diagram 10 - 12 cm long to show the structure of a named filamentous alga. .

(a) Describe the process of osmo regulation in (I) a named unicellular organism (ii) man (b) Describe how the mammalian skin can react to regulate the body temperature in a hot room.

(a) What is meant by competition. (b) Explain briefly the terms: (i) interspecies competition: (ii) intra species competition. (c) Explain two ways each by which the toad/frog is structurally adapted to the following: (I) obtaining me food (ii) protection (iii) movement.

(a) List three transmittable characters in: (I) human beings (ii) plants (b) State three ways in which genetics has contributed to improvement of agriculture. (c) A homozygous tall parent was crossed with a homozygous short parent. The offspring in F\(_1\) generation were all tall. An offspring of F\(_1\) generation was then crossed with another homozygous short individual. (i) Illustrate the crosses with suitable diagrams.(ii) What is the phenotypic ratio of the offspring in the F\(_2\) generation? (iii)What is the genotypic ratio of offspring in the F\(_2\) generation? (iv)What is the probability that an individual that has genotype Tt will produce a gamete withT\(_1\) gene? Briefly explain your answer.

\(\begin{array}{c|c} class& 1 - 3 & 4 - 6 & 7 - 9\\ \hline Frequency & 5 & 8 & 5\end{array}\) Find the standard deviation of the data using the table above

The pie chart shows the distribution of students in a secondary school class. If 30 students offered French, how many offered C.R.K?

In the above fig, PQ and R are vectors, which of the following options, gives a correct relationship between the vectors?

The resultant capacitance in the fig above is

If the current in the resistor R in diagram above is 0.05A, calculate the p.d. across the inductor.

The option above shows the PH changes for the titration of a

A particle that contains 8 proton, 9 neutrons and 7 electrons could be written as?

In general, an increase in temperature increases the solubility of a solute in water because?