Study carefully specimens H, Jand K and use them to answer questions 4(a) to 4(d).
(a) State the habitat of specimen J.
(b) State (i) five observable features of specimen J;
(ii) how the features in 4(b)(i) adapt specimen J to its habitat.
(c)(i) List two differences between specimens H and J.
(ii) State three similarities between specimen H and the skin of specimen J.
(iii) State how the similar features named in 4(C)(i) above adapt specimen H for its functions.
(d)(i) Classify specimen K into its phylum and class. (ii) Give three reasons for placing specimen in its class.
(iii) List three observable features of specimen K and state how these features adapt it to its mode of life.
A farmer applied different concentrations off cytokinins to his pineapple plants and observed tne development of new shoots Over a period of time.
The result of his observation is shown below.
| S/No. | Conc. of Cytokinin(mg/litre) | No. of new shoots |
| 1 | 0 | 2 |
| 2 | 1 | 5 |
| 3 | 2 | 8 |
| 4 | 3.5 | 12 |
| 5 | 4 | 18 |
| 6 | 4.5 | 25 |
| 7 | 5 | 20 |
| 8 | 6 | 10 |
| 9 | 7.5 | 8 |
| 10 | 8 | 6 |
| 11 | 9 | 5 |
| 12 | 10 | 5 |
(a) Plot a graph to show the relationship between cytokinin concentration and shoot development.
(b) Use the graph to describe the effect of cytokinin concentration on shoot development.
(c) What advice should be given to the farmer based on the results from the graph?
(d) List (2) two substances in plants, (ii) two substances in animals which have similar effect as cytokinins.
Study specimens A, B and C carefully and use them to answer questions (a) to (d).
(a) State the habitats specimens A, Band C.
(b) State (i) two observable features each of specimens A,B and C.
(ii) how the features in 1(b)(i) adapt the specimens to their habitats.
(c) State three Observable differences between specimens A and C.
(d) Make a drawing 8- 10cm long of specimen C and label Tully.
(a) What is growth?
(b) State two differences each between;
(i) growth in plants and animals
(ii) metamorphosis in housefly and toad.
(c) Name two hormones each involved in:
(i) plant growth
(ii) animal growth.
(d) State the effects of the hormones named in (c) above.
(e) Name the type of germination which takes place in:
(i) monocotyledonous plants
(ii) dicotyledonous plants.
(f) In a tabular form state four differences between the forms of germination named in (e) above.
(a) With the aid of annotated diagrams only, outline the water cycle.
(b) Describe an experiment to show that water is conducted in the xylem tissue of flowering plants.
(a) What is variation?
(b) State five advantages of variation within a species.
(c) In a tabular form, outline four differences between continuous and discontinuous variations.
(d) Explain the following terms:
(i) Sex-linked characters
(ii) Co-dominance
(iii) Hybrid vigour
(a) What is meant by the term Food chain?
(b) Draw a food chain involving four trophic levels which can be found in a terrestrial habitat.
(c) Explain
(i) the flow of energy through the food chain drawn in (b) above;
(ii) how energy in the chain is lost to the environment.
(a) Explain why an athlete in a race would be given a glucose drink rather than a piece of bread.
(b) Outline the test for starch in a given food substance.
(c) State five reasons why water is important in human diet.
(a) What is a sense organ?
(b) List four sense organs found in mammals.
(c) Describe the processes that will cause a person who has been spinning to feel dizzy
(d) State two functions each of the following structures:
(i) Cerebellum
(ii) Cerebrum
(iii) Medulla Oblongata.
Evidence for evolution include the following except?
- A. fossil records
- B. Comparative anatomy
- C. mutation of genes
- D. geographical distribution of genes
An animal which is active during the day is known as
- A. nocturnal animal
- B. diurnal animal
- C. terrestrial animal
- D. homoiothermic animal
Cytokinesis of mitosis is a process that ensures that
- A. each daughter cells gets the necessary organelles
- B. there is distribution of a complete set of genes into each daughter cell
- C. daughter cells inherit new genetic combinations.
- D. worn out organelles are excluded from daughter cells
A dairy farmer allowed only his best milk producing cows to mate. In succeeding generations of cows: milk production increased. This outcome is an example of
- A. artificial selection
- B. natural selection
- C. competition
- D. cross fertilization.
A man who is heterozygous for the disease haemophilia marries a woman who is double recessive for haemophilia. What percentage of their offspring would have the disease?
- A. 0%
- B. 25%
- C. 50%
- D. 75%
DNA in eukaryotic cells is contained in the
- A. central vacuole
- B. nucleus
- C. lysosome
- D. Golgi body
The immediate product of meiosis in flowering plants is the
- A. sporophyte
- B. gametophyte
- C. zygote
- D. pollen grain
Which of the following diseases is not hereditary?
- A. Albinism
- B. Scabies
- C. Haemophilia
- D. Colour blindness
The allele responsible for sickle-cell anaemia first appeared in the tropical and subtropical regions of Asia, the Middle
East and Africa. It entered the United States of America when individuals were forcibly brought over from Africa. In micro-
evolutionary terms this is an example of
- A. mutation
- B. gene flow
- C. genetic drift
- D. natural selection
The outward appearance or an organism is referred to as
- A. phenotype
- B. genotype
- C. dominance
- D. recessiveness
An example of continuous variation is
- A. fingerprint
- B. tongue rolling
- C. blood grouping
- D. body size
Variation is important in human life and can be used for the following activities except
- A. crime detection
- B. population distribution
- C. blood transfusion
- D. determination of paternity