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?
Explanation
| specimen | Test | Observation time(sec) | Medium of spread | sense organ |
| p |
2 drops of specimen p + water |
5 - 10 | liquid / water | Eye(s) |
| Q |
Leveled teaspoonful of specimen Q + water |
300 - 1800 | liquid / water |
Eye(s) |
| R | Specimen R was cut open | 0.1 - 2 | Gas / Air | Nose |
(b) (b) Biological Phenomenon that Occurred: Diffusion.
(c) Factors that will Increase the Rate of Phenomenon for each Activities:
(i)-Decreased concentration of the potassium permanganate: -Shaking/stirring/agitating: -Increased.temperature/heat.
(ii)-Grinding/increasing the surface area of Specimen Q to reduce the molecular/grain size;
-Decreased quantity of Specimen Q; Shaking/stirring/agitating;-Increased temperature/heat.
(iii) -Increased air current/breeze/fan; Increased quantity of specimen R;-increased temperature/heat.
Other types of fingerprints:-Whorl Loop;-Arch, Contour,- etc. (any other three types different from the One or the thumbprint).
(V) Advantages ot Fingerprints: or crime detectton.securing documents.-Highly accurate/secure.-Unique/non-transferrable.
-identification,-Data base.-Genetic engineering.
Most economical technique/cost effective.Easy to use/ease of use.
-Use ot smalt storage space/little storage space needed.-Provides accountability (biometric proof to show person was there when an event occurred).
(V) Type of Variation: Discontinuous/Morphological.