46. In a complete dominance monohybrid cross between a pure breeding yellow-flowered plant Y and a pure breeding white-flowered plant y, the result of the first filial generation is _________
- A. 50 % yellow flowers
- B. 75% yellow flowers
- C. all yellow flowers
- D. all white flowers
47. A man whose blood group is heterozygous B is married to a woman whose blood up is also heterozygous B
Which of the following statements is correct about the blood group of their four offspring?
- A. Three of them belong to blood group B
- B. Three of them belong to blood group O
- C. None of them belongs to blood group O
- D. Two of them belong to blood group B
48. The cross between RrTtand rrttwhere R is a gene for red colour and T for tallness will result in______
- A. all the offspring being tall with red fruits
- B. 25 % tall with red fruits
- C. 50 % tall with red fruits
- D. 75 % tall with red fruits
49. The yellow and black stripes on the body of wasps is an example of________
- A. mimicry
- B. courtship behaviour
- C. camouflage
- D. warning colouration
50. The biological importance of the dance by the worker honeybee is that it___________
- A. acts as a signal for mating
- B. serves as a warning signal
- C. signals the availability of food
- D. serves as a means of identifying members of the caste
BIOLOGY PAST QUESTIONS THEORY 2019 WITH SOLUTIONS
1 a. Name five vertebrae in mammals with their corresponding locations. [10 marks]
b. State one function each of the following parts in a dicotyledonous leaf:
(i) palisade;
(ii) vascular bundle;
(iii) epidermis. [3 marks]
c. State one function each of the following parts in the stem of a flowering plant:
(i) sieve tube;
(ii) cortex;
(iii) pith.
d. In a tabular form, state:
(i) two external structural differences between the stem and root of a maize seeding. [2 marks]
(ii) two internal structural differences between the stem and root of a maize seeding. [2 marks]
2.
- State three features of the small intestine that increase the rate of absorption of digested food. [3 marks]
- Explain briefly what happens to the glucose formed in a plant during photosynthesis. [3 marks]
- Explain briefly the mode of feeding in each of the following organisms:
(i) Euglena; [4 marks]
(ii) Spirogyra. [4 marks] - State threecharacteristics of an Estuarine habitat. [3 marks]
- State threedifferences between an aquatic habitat and a terrestrial habitat. [3 marks]
3.
- State five :
(i) challenges that make conservation of resources difficult; [5 marks]
(ii) ways by which the Government of a country ensures conservation of natural resources. [5 marks] - What is an endangered species? [3 marks]
- A child with blood group O was born to a mother of blood group A.
(i) What is the blood group genotype of the child? [1 marks]
(ii) What are the possible blood group genotypes of the father? [3 marks] - State three reasons why genetic variation is important to plants. [3 marks]
4.
- A homozygous tall, red flower plant was crossed with a homozygous dwarf, white flower plant. The F1 were selfed and 160 F2 plants were obtained.
(i) Name the type of genetic cross. [1 marks]
(ii) State one reason for the answer in 4(a)(i). [1 marks]
b.(i) What is evolution? [2 marks]
(ii) With the aid of a genetic diagram, state the phenotypic ratio of F2 generation. [13 marks]
(iii) Calculate the number of tall and white flowers that would be obtained in the F2 generation. [3 marks]
5.
- (i) Complete the table below with the respiratory surface of each of the listed organisms.
organism | respiratory surface |
Tadpole (2days old) |
|
Cockroach |
|
Domestic fowl |
|
Talinum |
|
Earth Worm |
|
Amoeba |
|
(ii) State five characteristic features of respiratory surfaces in organisms. [5 marks]
- Make a drawing, 4 cm – 6 cm long of the respiratory organ in Tilapia and label fully. [9 marks]
