Biology JAMB, WAEC, NECO AND NABTEB Official Past Questions

                                                                                                 SECTION A

Answer all the questions in both sections

1. State the importance of the following elements to plants: (a) iron: (b) phosphorus (c) calcium (d) potassium

2. Give one example each of the following (a) plant parasite (b) saprophytic plant (c) carnivorous plant.

3. List two structural modifications each of one named bird which feeds on: (a) nectar, (b) flesh.

4. State three principles on which the use of the quadrat for determining population density is based on

5. (a) Name the nucleic acid that caries inherited traits (b) Name four elements found in the named nucleic acid.

6. Diagrams A and B below represent the reaction of some structures in the mammalian skin to different environmental conditions.

Use them to answer questions (a) and (b)

(a) Which of the diagrams represents tne reactions of the skin to cold condition? (b) List four observations from the diagrams to support your answer.

7. State three methods of controlling growth of micro- organisms.

8. In an experiment it was found that auxin was concentrated more on the shaded side of the shoot as shown in the diagram below

Use the diagram to answer questions (a) to (c): 

(a) From which direction did light reach the shoot? (b) Towards which of the directions, side A or side B will the tip grow? (c)Suggest a title for this experiment. Layer of trapped air Layer of- trapped air.

                                                                                                SECTION B

Answer all the questions

 9 Examine specimens A and B carefully, (a) State: (i) two similarities (ii) four differences. In structure between them (b) Make a labeled drawing 6-8 cm wide of the cut surface of specimen A.

10. (a) identify specimens C and D without giving reasons for your answer.

(b) In a tabular form state three differences in external features between specimens C and D.

(c) Remove a quill feather from specimen D and label it D. Make a fully labeled diagram 10 to 20 cm long of specimen D

(d) Explain how four observable features of specimen C adapt the organism to life in water. Shoot.

11. The amount of starch hydrolyzed by the enzyme ptyalin over a period of time at three different temperature are given in the table below

(a) Placing time on the horizontal axis and the amount of starch hydrolyzed on the vertical axis, plot the date given for the different temperatures on the sam graph (b) From the graph deduce the effect(s) of temperature on the action of ptyalin on starch (C) Calculate the amount of starch hydrolyzed at the (i) 7th minute at 15°C (ii) 12th minute at 25°C (i) 24th minute at 45°C.

(a) List four characters which can be transmitted from parent to offspring in man.

(b) State two differences between mitosis and meiosis.

(c) Explain briefly the importance of meiosis and fertilization in the reproduction of organisms.

(d) In a monohybrid cross between a pure breeding plant that produces blue flowers and a pure breeding plant that produces white flowers, the F1 generation produced only blue flowers. By means of labelled cross diagrams, state the type of flowers you would expect if the Fl generation is (i) self-pollinated; (ii) cross-pollinated with a pure breeding plant that produces white flowers. Give reasons for your answers in (d) (i) and (ii). 
 

(a) Give a brief description of the characteristics of the Northern Guinea Savanna.

(b) Describe how you can estimate the density of a plant species using a quadrat.
 

(a) Describe the process of inhalation in man .

(b) Describe briefly the process of gaseous exchange in the shoo: system of flowering plants.

(c) Describe an experiment to demonstrate the effect of distilled water on mammalian red blood cell.
 

(a) (i) List two diseases each of plants and animals caused by bacteria.
(ii) State three ways in which bacteria are useful.

(b) State three methods by which mosquitoes can be controlled and state the reason for each method

(c) Describe an experiment to demostrate the presence of bacteria under the finger nails

The property of clay soil that prevents it from supporting thick vegetation is its

Lamarck’s evolution theory could be summarised by the statement that

The swarming especially at the beginning of the rainy season is a courtship behaviour shown by?

The division of labour in social insects is an example of

The changing of colour by a chameleon to that of the environment is
an example of

Which of the following does not illustrate adaptation to the
environment?

Which of the following is a function of the chromosome?

Study the genetic cross above showing the inheritance of blood groups from the cross above which of the following F offspring does not
belong to the father?

Which of the following diseases or disorders can be prevented by the application of the knowledge of
heredity through marriage counselling?

The offspring produced when pure strains interbreed is described as

Identical twins inherit their genes from

One of the major criticisms against ‘Mendelian laws is that they do not recognize that

One of the factors that must be considered for safe blood transfusion is

The table below indicates the result of an experiment during which grains of different colours in two maize cobs were counted
 

Which of the following ratios agrees with the result?

The following agencies are responsible for conservation of in Nigeria except

The largest game reserve in Nigeria is the