Study Specimens P, Q and R and answer questions 4(a) to 4(d).
(a) Use the information below to complete the following table. (i) Add two drops of specimen P into a beaker containing water, leave it undisturbed and note the time it completely disperses in water. (ii) Add a leveled teaspoonful of specimen Q into another beaker containing water, stir for one second and note the time it takes to completely dissolve. (iii) Cut open specimen R and note the time the odor was perceived. (iv) Give the medium of spread for each of the tests in 4(a)(i) to 4(a) i).
(v) Name the sense organ in humans involved in each of the observations in 4(a)(i) to 4(a)(iii).
| specimen | Test | Observation time(sec) | Medium of spread | sense organ |
(b) Name the biological phenomenon that occurred in 4(a)(iii).
(c) State two factors each that will increase the rate of the phenomenon named in 4(b) for each of the activities in 4(a)(i). (ii) and (iii)
(i) _____________ (ii) _____________ (iii) _____________
(d) Gently place your thumb on the inked stamp pad provided. (i) Neatly thumbprint clearly showing the pattern in the box below.
(ii) Name the type of pattern in the fingerprint in 4(e)(i).
(iii) List three other types of fingerprints. (iv) State three advantages of fingerprints.
(v) What type of variation is fingerprint?
Study Specimens E, F, and H and answer questions 2(a) to 2(f).
(a) What types of fruits are specimens E, F, and H?
E: _________ F:_________ H: ___________
(b) Name the types of placentation possessed by each of specimens E, F and H:
(c) Name one agent of dispersal each of specimens E, F and H? E: H: F: F:
(d)(i) Explain briefly how specimen E is dispersed. (ii) State two types of nutrients present in specimen E.
(e)(i) What is the color of specimen H? (ii) What does the color of specimen H signify?
(f) Using the scalpel/blunt knife provided, cut open specimen H along the line of split from one side only.
(i) Name the type of placentation found in specimen H.
(ii) Make a drawing, 6 cm to 8 cm long of the two split halves of specimen H while still joined at one length and label fully.
1. Study Specimens B, C and D and answer questions 1(a) To 1(f).
(a) i) Place two drops of specimen B on a white tile and add two drops of iodine solution.
Complete the table below with the test, observation and inference:
|
test |
observation |
inference |
(aii) Put 5 ml of specimen B into a test tube and add 2 ml of sodium hydroxide solution followed by three drops of copper (ii) tetraoxosulphate (VI) solution and shake Complete the table below with the test, observation and inference.
|
test |
observation |
inference |
(b) Give the name of each of the tests in 1(a)i) and 1(a)(ii). (i) ____________ (ii) _____________
(c) State two ways by which specimen C is of economic importance.
(d)(i) Name the Kingdom to (1) (ii) which specimen C belongs. (ii) State three reasons for the. answer in 1(d)(i). (iii) Name four other organisms that belong to the same Kingdom as specimen C.
(ei) Name the Phylum to which specimen D belongs. (ii) State three reasons for the answer in 1(d)(i).
(f)(i) Explain briefly the role of specimen C in nutrient cycling. (ii) What is the mode of nutrition of specimen C.
(a) Explain briefly the following types of fertilization in animals; (i) external fertilization (ii) internal fertilization
(b) Name two groups of animal each that exhibit the types of fertilization in (a)
(c)(i) If the placenta in a pregnant woman is detached from the uterine wall, give three effect this will have on the foetus
(ii) Name three other features in the uterus of a pregnant woman that are useful for the development of the foetus
(d) Explain briefly how the activities of organisms bring bout dynamic equilibrium in the habitat.
(e) State four problems that organisms in the intertidal zone of a marine habitat could encounter.
(f) Explain briefly the reasons that the following factors are necessary for germination; (i) moisture (ii) viable seeds
(g) Explain briefly the reason light energy is considered a limiting factor in the production of foods by autotrophs.
(a) Explain briefly; (i) independent assortment of genes (ii) the reason blood group O in humans can only exist in homozygous form while blood groups A and B can exist both in homozygous and heterozygous forms.
(b) Complete the table below by naming the classes of vertebrates in their evolutionary trend and giving one example each of the classes.
| Classes of vertebrate | One example |
(a) Complete the table below;
| Disease | Causative organism | Vector | Control |
| Cholera | |||
| Trypanosome | |||
| Female Anopheles mosquito | |||
| Ringworm | None |
(b) Explain briefly the biological basis of preserving foods using each of the following methods;
(i) salting (ii) irradiation (iii) smoking
(a)(i) What is a deficiency disease?
(ii) Complete the table below by naming five nutrient deficiency diseases in humans and stating one remedy for each of the diseases.
(b) Outline a chemical test for (i) Starch in a tuber of yam (ii) Glucose in orange fruit
| Nutrient deficiency disease | Remedy |
(a) Explain briefly how the human ear carries out its function of balancing.
(b) (i) make a drawing 8 cm – 10 cm long of the structure of the human ear and label fully.
(ii) Describe briefly the structure of the middle ear in humans.
Which of the following statements best explains the reason why termites swarm at night?
- A. Light is not necessary for swarming
- B. They avoid day-flying birds
- C. Light destroys their wings
- D. They can only see in the dark
Who proposed the theory of evolution by natural selection
- A. Darwin
- B. Lamark
- C. Aristotle
- D. Linnaeus
Replication of DNA molecules is catalysed by an enzyme called
- A. polymerase
- B. ptyalin
- C. pepsin
- D. amylase
The diagram above is an illustration of a cross between plants A and B of the same species. Study it to answer the question below
The process that gave rise to the F1 generation is
- A. self fertilization
- B. cross fertilization
- C. out-breeding
- D. test cross
The diagram below is an illustration of a cross between plants A and B of the same species. Study it and answer the question below;
If the F1 generation are plants with high yield and resistance, the genotype of the F1 generation plants would be
- A. YYRR
- B. YyRr
- C. yyRr
- D. yyrr
Which of the following diseases can be inherited?
- A. Pneumonia
- B. Whooping cough
- C. Sickle cell anemia
- D. Malaria
Which of the following statements about chromosomes is correct?
- A. All the chromosomes of a species are the same shape
- B. The number present in a specie is constant
- C. They are neatly arranged in a cytoplasm
- D. They bear ribosomes on their outer membranes
Measurements of height and weight of students in a class show
- A. discontinuous variation
- B. continuous variation
- C. shortness is more prevalent
- D. fatness is less prevalent
Variation which exhibits a wide range from one extreme to the other is
- A. phenotypic variation
- B. discontinuous variation
- C. continuous variation
- D. genotypic variation
A child that can receive blood donation from anybody belongs to the blood group
- A. O
- B. A
- C. B
- D. AB
Which of the following substances is not a conservable natural resource?
- A. Mineral
- B. Air
- C. Soil
- D. Water
A company was prohibited from producing bags made from natural leopard skin. This is an attempt to conserve
- A. land
- B. water
- C. wildlife
- D. minerals
Conservation of natural resources does not
- A. maintain a balanced ecosystem
- B. preserve the beauty of nature
- C. attract tourists
- D. threaten the survival of species