Presence of hairs /wing-like structures/floss/extension which increase surface area for buoyancy; making it easy for fruits/ seeds to be blown away; - Fruits /seeds are light due to small size; therefore, easily carried away by wind; 58. a) A- Ovary B- Oviduct/ fallopian tube C- Uterus/ uterine wall D- Cervix b) Produce ova Produce femme hormones/ Estrogen and progesterone c) - Highly vascularized to supply nutrients to foetus/ drain away excretory wastes - Inner wall lined with Endometrium for implantation of fertilized egg/ zygote - Muscular for peristalisis to expel menses during menstruation/ parturition - Great capacity to expand during gestation to accommodate developing foetus d) -copulation/ Achieve orgasm in Human male followed by ejaculation - birth canal 59 . a) chorion; Rej Amnion/Amniotic membrane. b) i) A: (umbilical Artery; Rej Arteriole B: (umbilical vein; Rej venule ii) More food nutrients; more oxygen in umbilical vein/less food nutrients; more excretory products in umbilical Artery; Rej.(ii)if (i) is wrong Rej oxygenated/deoxygenated c) highly vescularized; -large surface area; acc. Numerous villi for large surface area -presence of secretory cells/are glandular; any 2 Rej. Source of hormones. d) cushion /absorbs shock/buoyancy; 60. (a) Time in minutes Growth pollen tube (MM)
b) i) 30min/aftter every 30min; Rej if no units ii) 20.4 -20.8mm; iii)105min-106min; Rej after 105/106 min. iv) 0 + 120minutes growth fast/growth rapid /rate of growth rapid/growth rate pattern rapid; Rej. Exponential growth reason: pollen tube young/has enough nutrients in culture; to 180 minutes- grows slowly /rate of growth decline /decrease/growth rate pattern decrease; reason: pollen tube mature/old/has exhausted nutrients; v) directs role gametes/nuclei/nucleus to ovules; Rej. Ovary/pollen grains for male gametes. c) integument develop/changes to-seed coat/testa; zygote-embryo; triploid nucleus-endosperm; ovary wall- pericarp; ovary- fruits; ovules-seeds; corolla/petals/style/stamens/filament-dry out /fall off /wither(losing a scar); calyx may persist(dry up &fall off) Rej. die/disappear. 11. Growth and development in (a) plants (b) animals 1. a) Moulting hormone/ ecdysone b) It allows growth to take place; since growth can not take place in the presences of the 2. a) Long sightedness/ hypermetropia ; b) Convex/ converging lenses;
3. (a) – Excretion; - Osmo-regulation; (b) – Glucose - Amino acids; (c) – Nephritis; - kidney stones /Gall stones; - Hepatitis A and B; (mark first 2 pts (2mks) 4. (a) Intermittent growth curve; (b) Moulting; (c) Ecdysone; 5. Natural immunity is inherited /transmitted from parent to offspring; Acquired immunity is developed after suffering from a disease or through vaccination; 6. A – Cell elongation/expansion ; B – Cell division/multiplication ; C – Cell différentiation/maturation ; 7. Continuous variation shows gradation in characteristic with intermediate; discontinuous shows distinct characteristics between organisms with no intermediate groupings; 8. a) to investigate the effect of the force of gravity on the growth of a seedling (shoot and root);
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