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BIOLOGY PRACTICAL QUESTIONS – SOTIK DISTRICT- 1ST EXAM
1. You are provided with two pieces of plant material labelled specimen Q. Using a scalpel cut two
slits half way to obtain four flaps through the middle of each piece as shown in the diagram
below:-
Place one piece in the solution labelled M1 and the other in the solution M2 . Allow the set up to stand for 30minutes
(a) After 30minutes remove the pieces and press them gently between the fingers
(i) Record your observations M1 M2
(ii) Account for the observations in A above
(b) Examine the pieces
(i) Record other observations besides those made in (a) (i) above
(ii) Account for the observations in (b)(i) above
2. You are provided with specimen labelled K
(a) (i) Name the class to which the specimen belongs
(ii) Give three reasons for your answer in a (i) above
(b) What term is used to describe the shape of the specimen?
(c) Name and draw the fins on the specimen that;
(i) Enable the specimen to balance, brake and change direction
(ii) Prevent the fish from rolling and yawing
3. You are provided with a specimen labelled
(a) (i) What part of a plant is specimen T?
(ii) Give a reason for your answer in a(i) above
(b) (i) Cut a transverse section through specimen T (i) Draw and label one of the cut surfaces (ii) State the magnification of your drawing
(iii) State the type of placentation of specimen T
(c) Name the agent of dispersal of specimen T
(d) State how specimen T is adapted to its mode of dispersal
SOTIK DISTRICT – 1ST EXAM BIOLOGY PRACTICAL MARKING SCHEME (ANSWERS)
1. (a) (i) M1 – stem firm/hard/stiff/rigid/tough
M2– stem soft/flexible/flabby Reject flaccid/weak
(ii) Solution M1 is hypotonic (to cell sap) /cell sap is hypertonic (to L1)
Solution M1 is less concentrated/more dilute than (cell sap; hence water moved into the
(stem) cells/osmosis occurs; cells become turgid
M2– Solution M2 is hypertonic/more concentrated than cell sap more dilute/cell sap
more dilute/ cell sap less concentrated (than L2); water moves out of the
cell/osmosis occurs; makes the cell flaccid
(b) (i) M1 (slit opens wider/widens/strip separates; and the bends/outwards or backwards or
curved; M2– strips) remains closed together/slits remains closed/strips shrinks or shrunk;
(ii) In M1 cells in inner surface/cut surface /cutical cells enlarge more/; because they took in
more water (by osmosis) than outer cells /outer surface/epidermal surface (which have
cuticle) OR
M2 Cells of inner surface/cut surface/cutical cells shrunk; because they lost more water
(by osmosis) than outer cells/epidermal cells which have cuticle
N/B mark only once i.e. for M1 or M2
2. (a) Pisces reject- spelling mistakes
- Pisces/fish or pisces(fish)
(ii) Presence of scales
- presence of fins
- – presence of lateral line
- -presence of gills
- Presence of operculum
(i) is tied to (ii), so if (i) is wrong reject reasons even if correct
(b) Streamlined;
(c) (i) pectoral fin
right identity-
Right drawing-
pelvic fin
N/B – Reject wrong drawing if identity is wrong
– Reject wrong fins among the right ones
– The shape should be continuous
– Accept spines are single lines e.g.
(ii) Dorsal fin N/B- Spines must be present to award a mark
Anal fin(Ventral fin)- Right identity-
-drawing
Caudial (Tail fin) N/B- The identity must be correct to award drawing mark
3. (a) (i) Fruit;
(ii) Two scars/point of attachment at receptacle and to the remains of style;
(b) (i) Drawing -3maks Mark clockwise
Label 5/2 = max 2
drawing mark 1
Given when there is continuous double outline of epicarp
drawing mark 2
Given when endocarp with seeds is present
loculi with juice sac is present
drawing mark 3
When placenta is centrally located and not shaded
(b) (ii) x ½ – x 3; N/B Reject X , x signs
(iii) Axial/Axile/Central; Reject mistakes- free central
(c)Animal, accept- man, human being
Reject- human alone, animal dispersal
(d) – Seeds are hard/slimy/slippery (coat) to prevent digestion;
– It is scented /sweet smell to attract the agent;
– It is brightly coloured to attract the agent;
– It is succulent / juicy to attract the agent; Mark any three correct
