K.C.S.E Biology Q & A - MODEL 2016PP2QN05
A freshly obtained dandelion stem measuring 5cm long was split lengthwise to obtain two similar pieces. The pieces were placed in two different solutions of different concentrations in petri dishes (L1 and L2) for 20 minutes. The appearance after 20 minutes is as shown.
​(a) Account for the appearance of the pieces in solutions L1 and L2
(b) Suite the significance of the biological process involved in the experiment.
answers
(a) L1 - Inner cells gained water by Osmosis; hence increased in length; epidermal cells did not gain water because they are covered by a water proof cuticle leading to curvature.
L2 - Inner cells lost water by osmosis; leading to (flaccidity) decrease in length; epidermal cells did not lose water due to waterproof leading to curvature (b) Absorption of water by the roots Opening and closing of the stomata  K.C.S.E Biology Q & A - MODEL 2016PP2QN04
The diagram below represents some gaseous exchange structures in humans.
​(a)Name the structures labeled K, L and M.
(b) How is the structure labeled J suited to its function? (c) Name the process by which inhaled air moves from the structure labeled L into blood capillaries. (d) Give the scientific name of the organism that causes tuberculosis in humans.
ANSWERS
​(a) K- Pleural membranes
L- Alveolus M- Intercostal muscles (b) Has C- shaped cartilage rings that support it preventing it from collapsing and allow free flow of air Inner lining has mucus secreting cells that trap fine dust particles and microorganisms Inner lining has hair like structures called cilia that enhance upward movement of the mucus to the larynx (c) Diffusion (d) Mycobacterium tuberculosis (underline separately). K.C.S.E Biology Q & A - MODEL 2016PP2QN03
The diagram below represents bones at a joint found in the hind limb of a mammal.
​(a) Name the bones labeled X, Y and Z
X Y Z (b) (i) Name the substance fi)und in the place labeled W. (ii) State the function of the substance named in (b) (î) above. (c) Name the structure that joins hones together at the joint. (d) State the difference between ball and socket joint and the one illustrated in the diagram above. (e) Name the structure at the elbow that performs the same function as the patella.
ANSWERS
​(a) X- Femur
Y- Tibia Z- Fibula (b) (i) Synovial fluid (ii) Lubrication of the joint/ shock absorption Distribution of pressure (c) Ligament (d) Ball and socket joint allows movement in all planes while the illustrated allows movement in one plane only. Accept 360 for all planes 180 for one plane (e) Olecranon process
K.C.S.E Biology Q & A - MODEL 2016PP2QN02
Explain why people with sickle cell trait have an adaption survival advantage over normal individuals in malaria endemic regions.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP2QN02
Differentiate between sickle cell anaemia and sickle cell trait.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP2QN02
How is sex determined in man?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP2QN01
The diagram below represents a human foetus in a uterus.
​(a) Name the part labeled S.
(b) (i) Name the types of blood vessels found in the structure labaled Q. (ii) State the difference in composition of blood found in the vessels named in (b) (i) above. c)Name two features that enable the structure labeled P to carry out its function. (d) State the role of the part labeled R.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP1QN30
State two advantages of hybrid vigour
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP1QN29
Name two tissues in plants that provide mechanical support
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP1QN29
State a characteristic that is common to all cervical vertebrae
ANSWER
K.C.S.E Biology Q & A - MODEL 2016PP1QN28
The diagram below shows a transverse section of a plant organ
​(a) Name the plant organ from which the section was obtained.
(b) (î) Name the class to which the organism from which section was obtained belongs. (ii) Give a reason for your answer in b (i) above. ​(c) Name the part labeled X
answers
(a) Stem
(b) (i) Monocotyledonae (ii) Vascular bundles are scattered and not arranged in a ring Absence of pith/ cambium (c) Epidermis
K.C.S.E Biology Q & A - MODEL 2016PP1QN27
Name the opening to the chamber of the heart of an insect.
answer
K.C.S.E Biology Q & A - MODEL 2016PP1QN27
Name an organism which has a single circulatory system.
answer
K.C.S.E Biology Q & A - MODEL 2016PP1QN27
What is single circulatory system?
answer
K.C.S.E Biology Q & A - MODEL 2016PP1QN26
State the functions of the following parts of a microscope.
(a) Objective Lens (b) Diaphragm
answers
|
TOPICSFORM 1
Form 2
Form 3
Form 4
Archives
December 2024
Categories
All
|
RSS Feed
ADS KEEPER HEADER
|
Primary Resources
College Resources
|
Secondary Resources
|
Contact Us
Manyam Franchise
P.O Box 1189 - 40200 Kisii Tel: 0728 450 424 Tel: 0738 619 279 Tel: 0763 450 425 E-mail - sales@manyamfranchise.com |