Blood circulation in a mammal is said to be double because?
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 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 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)(i) Specimen A is a flower. Remove all the stamens and three petals from specimen A leaving the special petal.
Make a drawing 10-12cm long of the remaining parts of specimen A and label fully.
(ii) what type of ovary is present in specimen A?
(ii) Give one reason for your answer in 1(a) (i) above.
(iv) Describe the petals and sepals of specimen A.
(v) What is the function of the special petal?
(vi) State three features of specimen A which have led to the success of flowering plants.
(b)(i) What type of fruit is specimen B?
(ii) Give two other examples of the fruit type.
(iil) State the mode of dispersal of specimen B.
(iv) State two biological importance of the class of fruit to which specimen B belongs.
