K.C.S.E Biology Q & A - MODEL 2018PP1QN11
State one homeostatic role of the human skin.
ANSWERS
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K.C.S.E Biology Q & A - MODEL 2018PP1QN10
Name two products of respiration in plants.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2018PP1QN09
The diagram below represents an organ in a bony fish
​(a) Name the organ.
(b) Describe how air in water reach the capillaries inside structure L.
ANSWERS
a) Gill;
b) Fish mouth opens lowering pressure in buccal cavity and water rushes in; mouth closes increasing pressure that forces water into the gill cavity/opercular cavity; O2 rich water flows over the gills in a counter current direction to capillary blood flow; causing O2 to diffuse into the gill capillaries;
K.C.S.E Biology Q & A - MODEL 2018PP1QN07
State three activities in the human digestive System that depend on respiration.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN07
Define respiration
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN06
The diagram below illustrates tissue fluid and cells surrounding a capillary.
​(i)Name fluid G.
(ii) Give two ways by which fluid G is different from tissue fluid.
answers
(i) (Blood) plasma;
(ii) Has (more large) proteins/blood platelets; High (hydrostatic) pressure/low pressure of tissue fluid; Has red blood cells;
K.C.S.E Biology Q & A - MODEL 2018PP1QN05
State why it is important for plants to lose water to the atmosphere.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN04
A group of form two students placed a fresh leaf in warm water. They observed that air bubbles formed on the surface of the leaf.
(a) What biological process were they investigating? (b) Name the structures from which the air bubbles were coming from. (c) Explain the distribution of the structures named in (b) above on the leaf surfaces of a land plant.
answers
​a) Photosynthesis;/gaseous exchange in plants;
b) Stoma/somata; c) Are more on the lower surface of terrestrial plants/fewer on the upper surface; to reduce transpiration;
K.C.S.E Biology Q & A - MODEL 2018PP1QN03
Which sets of teeth would be used in chewing sugarcane for maximum extraction of sap?
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K.C.S.E Biology Q & A - MODEL 2018PP1QN02
State two observable features that place a millipede into its Class.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN01
​(a) Name the cell organelle found in abundance in the white blood cells.
(b) Give a reason for your answer in (a) above.
answers
a)Lysosomes/golgi apparatus;
b)White blood cells fight pathogens to protect the body, the lysosomes contain lytic enzymes which destroy pathogens;/golgi apparatus synthesize lysosomes which contain lytic enzymes that destroy parthogens; K.C.S.E Biology Q & A - MODEL 2017PP1QN23
The diagram below represents a set up during an experiment.
​(a) (i) What was, the experiment investigating?
(ii) State the likely identity for substance K (iii) Explain your answer in (a) (ii) above (b) Account for the observations made in flask 2.
answers
​a.) i) To investigate how ants respond to moisture/water hydrotaxis (varied environments with/without moisture water);
ii) Silica gel/anhydrous calcium chloride pellets/pyrogallic acid/dehydrating drying agent; iii) The colour of cobalt (II) chloride paper remained blue/all the moisture water vapour was absorbed/There was no water/moisture in the flask to change the colour of cobalt(II) chloride paper; b.) (More) ants were attracted) moved into the flask; due to the presence of moisture/water vapour; (evidenced by the change of cobalt (II) chloride paper to pink)
K.C.S.E Biology Q & A - MODEL 2017PP1QN22
State two ways by which plants manage their solid wastes.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN21
The photograph below represents a leaf obtained from a certain plant.
​Account for the observations made if the leaf was tested for starch.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN20
State three methods of fossil formation.
answers
​i. Petrification/change into rock;
ii. Entire organism or parts preserved; iii. Impressions (e.g. casts/moulds); K.C.S.E Biology Q & A - MODEL 2017PP1QN18
Below are diagrams representing developmental stages of three different vertebrates.
​(a) State the evidence of evolution illustrated by the vertebrates in the diagram.
(b) Suggest why the structure labelled J has been retained throughout the evolution of fish. (c) State two major advantages evolution has given humans Over most of the other animals.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN17
How is the surface area increased in the mammalian small intestines?
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN16
The following are text messages on a celiphone that represent gene mutation.
​(a) Identify the type of gene mutation represented in each case
I II (b) State Mendel’s First Law. (c) State two disadvantages of genetically modified plant products.
answers
​a. I — Deletion;
II- Inversion; b. The characteristics /traits of an organism are determined by internal factors/ genes (which occur in pairs). Only one of the genes can be carried in a gamete/ passed onto the next generation; c. Most have lost most of the original (desirable) qualities e.g taste; Poor/undesirable qualities are perpetuated through subsequent generations; Products’ qualities are irreversible- can’t get original species/qualities;
K.C.S.E Biology Q & A - MODEL 2017PP1QN15
Explain the physiological process responsible for keeping young seedlings upright.
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN14
The photograph below illustrates a germinating seedling.
​(a) Name the type of germination illustrated in the photograph.
(b) Explain the function of each of the parts labelled G and H. G H
answers
​ a. Epigeal;
b. G- Elongates to expose the foliage leaves to light photosynthesis H- Stores food (for growth); For photosynthesis (it is green); Protects plumule during germination; K.C.S.E Biology Q & A - MODEL 2017PP1QN12
Explain the survival values of the following tropic responses to plants.
(a) Geotropism (b) Phototropism
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN11
The set up below illustrates a certain physiological process.
​(a) (i) Name the physiological process.
(ii) Give two examples of the process named in (a) (i) above in plants. (b) State two ways by which the movement of dye molecules in the set up would be slowed down.
answers
​a i) Diffusion;
ii) Gaseous exchange/excretion of carbon (IV) oxide and oxygen; Translocation of materials; Absorption/uptake of mineral ions/salts; b. Lowering the temperature of the medium; Increasing thickness of the membrane; Use less dye/add more water/reducing the concentration gradient;
K.C.S.E Biology Q & A - MODEL 2017PP1QN10
State two structural adaptations of leaves that maximize efficiency in gaseous exchange
answers
K.C.S.E Biology Q & A - MODEL 2017PP1QN10
State the effect of movement of the diaphragm muscles during inhalation in mammals.
answers
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