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Biology Paper 1 Answers (Bondo Mocks 2006) Question Paper

Biology Paper 1 Answers (Bondo Mocks 2006)

Course:Secondary Level

Exam Year:2006

BONDO DISTRICT FORM FOUR JOINT MOCKS
MARKING SCHEME
231/1
BIOLOGY PAPER 1

1. Movement of molecules against concentration gradient; using energy
2. (i) Conditions where other floral parts are positioned/ arise below the ovary/superior ovary;
(ii) female flower,
3. Analogous structure which (appear similar and) perform similar / same functions but different origins;
Homologous - structure which have a common origin but (have evolved) to perform different function;
4. a) substance that activate the enzymes:
b) iron /mg/zn/cu/ca/Mn4/cobalt/molybdenum/k
Fe2+ Mg2+ Zn2+ Cu2+ Ca2+ Mn Acc Correct Ionic Form;
5. Proper disposal of human waste/faeces;
Destroy breeding sites of vectors
Proper cooking of food /boiling of drinking water;
Use of insecticide against vectors / drugs against pathogens
Use of protective dwelling /mosquito nets to prevent vector bites/ proper hygiene;
6. Cell sap is more conc. Than the surrounding water, water get into the cell by osmosis;
the cell swell/become turgid; but doesn’t burst due to the cell wall,
7. Body parts/division
number of limbs /legs;
body segments
8. a) Ball and socket;
b) Hinge
9. (i) Pulmonary artery;
(ii) Hepatic portal vein;
10. Large surface area;
Thin membrane
Moist surface
11. a) To split water/photolysis;
b) Glucose
12. a) Regulation of blood sugar/ control conversion of glucose to glycogen;
b) Control re-absorption of water in the kidneys/ nephron/ loop of henle /regulation of water in the body osmotic pressure of the blood;
13. a) Converted to fat; and stored; (beneath the skin, or around body organs)
b) peristalsis
Acts as a valve;
14. a) Secondary cambium /cork cambium/ vascular cambium;
b) soften stored food for breakdown; soft seed coat;
Transport dissolved substances;
Medium of enzymes action;
15. a) Reduction of friction/lubrication; absorption of shock / distribution of pressure (at joint);
b) Smooth muscle /visceral muscles;
Skeletal/ striated muscles;
Cardiac muscles;
16. a) Discrimination of colour/details/accurate vision/colour perception/ sensitive to light of high
intensity
b) Sensitive to light of low intensity/ dim light vision;
17. Inversion; duplication; deletion; translocation; non-disjunction
18. 2-5 km population increase – because sewage provide nutrients
5-10 km population decrease because of depletion of nutrients; in sewage/ decomposition of sewage is complete;
19. In coming into contact with the support Auxin concentration reduce on the side experiencing touch stimulus; reducing growth rate; making the plant bend round the support;
20. a) Capsule;
b)Sori/ sorus;
21. a) Prophase I
b) (i) An ovum is fertilized; and later cells separate in the early cell division;
(ii) Two ova are released; and fertilized by two different sperms;
22. a) stored food is used up/broken down by enzymes to provide nutrients for germinating embryo
b) Promotes cell division/cell elongation; parthenocapy.
Formation of side branches of stems;
Affect leaf expansion and shape /retard leaf abscission
23. a) Rough/ smooth – endoplasmic/ golgi bodies/ ribosomes/ lysosomes
b) mitochondria/ mitochondrion;
24. a) A - Root hair;
B - endodermis
b) A- Absorption of water;
C- Transport water, transport mineral salt;
D- transport manufactured food;
25. a) Most enzymes in the body function within a narrow range of temperature;
High temperature denature enzymes
Low temperature. Inactivate enzymes inhibits enzymes;
b) Sugar is a raw material for respiration; therefore less sugar leads to low rate of respiration; hence less energy available to the body / low rate of metabolism;
26. Broad/flat lamina; to provide large surface area for absorption of gases;
Thinness to allow gases to pass through a short distance; presence of stomata to ensure efficient diffusion of gases presence of air spaces for gases to diffuse easily/
27. carbon iv oxide;
ethanol / alcohol;

Biology Paper 1 Answers (Bondo Mocks 2006) Question Paper

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