Name the part of a light microscope used to bring an image of a specimen into sharp focus.26/6/2020
K.C.S.E Biology Q & A - MODEL 2012PP1QN12
Name the part of a light microscope used to bring an image of a specimen into sharp focus.
answer
K.C.S.E Biology Q & A - MODEL 2012PP1QN10
What is meant by the term irritability?
answers
K.C.S.E Biology Q & A - MODEL 2011PP2QN01
The set-up below illustrates a procedure that was carried out in the laboratory with a leaf plucked from a green plant that had been growing in sunlight.
(i) What was the purpose of the above procedure?
(ii) Give reasons for carrying out steps A, B and C in this procedure. A B C (iii) Name the reagent that was used at the step labelled D. (iv) State the expected result on the leaf after adding the reagent named in (iii) above.
ANSWERS
​(i) - Testing a leaf for the presence of starch;
(ii) - A - kill the leaf/break down cells/stop enzymatic activity; B - Removal of chlorophyll; C - Soften leaf/makes leaf less brittle; (iii) Iodine solution; (iv) Areas where starch is present stain blue/blue black; K.C.S.E Biology Q & A - MODEL 2011PP1QN15
Give reasons for carrying out the following procedures when preparing temporary wet mounts of plant tissues.
(a) Making thin plant sections. (b) Adding water on the plant section. (c) Placing a cover slip over the plant section.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN11
State the functions of the following parts of a light microscope.
(a)Fine adjustment knob. Stage.
answers
(a)Moves the body tube through smaller distances to bring the image/specimen/object into sharper focus;
(b)Platform where specimen (on slide) is placed; K.C.S.E Biology Q & A - MODEL 2011PP1QN04
State one use for each of the following apparatus in the study of living organisms.
(a) Pooter (b) Pitfall trap
answers
(a) Sucking small insects/animals;
(b) A trap into which small animals fall and get trapped; K.C.S.E Biology Q & A - MODEL 2009PP1QN03
State the functions of the following parts of a light microscope
(a) Objective lens (b) Diaphragm
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN02
Give a reason why staining is necessary when preparing specimens for observation under the microscope
ANSWER
K.C.S.E Biology Q & A - MODEL 2001PP1QN01
Other than having many features in common, state the other characteristics of a species
ANSWERS
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