BIOLOGY PRACTICAL QUESTIONS AND ANSWERS – MUMIAS DISTRICT

 BIOLOGY PRACTICAL QUESTIONS – MUMIAS DISTRICT

Requirements :-

• Unripe pawpaw fruits (one pawpaw- ten students)
  
• Beaker (4)
  
• Razor /scalpel
  
• Ruler
  
• Solution G – distilled water
  
• Solution H – salt solution of different concentration namely 10%, 20%, 60%
  
• Labels
  

1.  You are provided with specimen D and two solution G and H.

 Cut five longitudinal strips of the specimen D peelings of approximately 0.5cm width,

  0.5cm breadth and 5cm length.

 Place one strip in a beaker having solution G.  Place other strips in separate beakers containing different concentration of solution H as indicated

  in the table below:  

  Leave the set-up for 30minutes

(i) Record your observations in the table below:

 (b) Account for the observation in trips 1, 2 and 4

 (c) Suggest the identity of solution G and H  

2.  During a biology lesson, students made drawings of invertebrates shown below. Use the dichotomous key provided below to identify the organisms;  

  1. a. Animal with wings ……………………………….go to 2

    b. Animal without wings …………………………….go to 3

   2. a. With one pair of wings……………………………………Housefly

    b. With pairs of wings ………………………………..Dragonfly

3. a. With three pairs of legs ……………………………Ant

    b. With more than three pairs of legs……………..…go to 4

4. a. With four pairs of legs ……………………………Spider

  b. With more than four pairs of legs ………………..go to 5

   5. a. With two pairs of antennae …………………..……go to 6

  b. With one pair of antennae…………………………go to 7

6. a. With six pairs of legs……………………………..Water slater

    b. With ten pairs of legs ……………………………..Fresh water shrimp

7. a. With a body ………………………………..….….millipede

  b. With a dorso-ventrally flattened body…………….Centipede

(a) Complete the steps 2(b) and 7(b) by filling in the key above  

(b) Complete the table to identify the organisms:

  (c) State the classes of specimens B, C, E and G

3.  The photograph Z below is apart of a plant. Examine it

(a) Label any three parts of the plant part in photograph Z

(b) Name the type of organisms that is associated with this part of the plant

(c) Photograph Z was taken from a special type of plant. What is the name of this group

of plants?

(d) Photograph Z exhibits a certain phenomenon;

(i) Name the phenomenon

(ii) State the significance of this phenomenon named in d(i) above

(iii) What is the product of this phenomenon?

(iv) Name two organisms that covert the product of the phenomenon in d(i) above into

the raw material

MUMIAS DISTRICT BIOLOGY PRACTICAL MARKING SCHEME (ANSWERS)

1.  a) Observations

b) Accounting for 1, 2 and 4

1: The cells of the inside of the peelings have cell sap which is hypertonic to solution

S; hence draws in water by osmosis; and (swells up to) become turgid; leading to

more increase in length of that side and curvatime on peeling sides

2: The cells of the inside of the peeling have cell sap which is atomic solution H; hence

no net osmosis 3: The cells of the inside of the peeling have cell sap which is hypotonic to solution H,

and lose water by osmosis to become flaccid; this side shrinks hence curvature

inwards

 c) Solution G – Distilled water

  Solution H – Concentrated solution  

2.  a) steps

2b – two  

7b- cyndrical  

 b)

c) Class

  B Arachnida  

C Insecta  

E Crustacea  

G Diploda  

3.  a) Legume stem;

    Roots

    Nodule  

 b) Rhizobium bacteria bacteria/ nitrogen fixing bacteria

 c) Leguminous plants  

 d)  i) symbiosis  

ii) Rhizobium bacteria which lives in the root nodules of leguminous plants fix free

nitrogen in the soil into nitrates which are absorbed by plants to make plant

proteins; bacteria benefit from shelter and carbohydrates provided by the plants;

this relationship enables plants to thrive on nitrogen deficient soils

iii) Nitrate

iv) Pseudommonas denitrificans

Thiobacillus denitrificans