=-=-=-=-=-=-= BIOLOGY OBJ: 1-10: DDACDACCDC 11-20: BDBCADBBCD 21-30: DDDAEACEAA 31-40: BABCDADCDE 41-50: DCDBEECCCC 51-60: ADBBDDDDAD =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= (1ai) Morphological variation refers to the noticeable physical appearance of individual of the same species. For example in human beings morphological variation include, height of the body, shape of the body etc (1aii) Pollination is the transfer of pollen from the anthers of a flower to the stigma of the same flower or of another flower. (1aiii) Niche is the specific area where an organism inhabits and the role they play there. (1b) (i) Both processes release energy (ii) Both start with the breakdown of a nutrient (glucose) (iii) Both yield byproducts (iv) Both take place in a cell (v) Both involve pyruvate (pyruvic acid) (1bii) (i)drought (ii)flood (iii)pests (iv)poor storage facilities (1ci) (i) Anthophyta (ii) Bryophyta (iii) Pterophyta (1cii) (i) Arrangement of vascular bundles in the stem are in concentric circles (ii) They have two cotyledons (iii) Flower parts in multiples of fours or fives(tetramerous or pentamerous) (iv) Roots develop from radicle =================================== (2a) DRAW THE DIAGRAM (2bi) -They have two pairs of libs -They have naked or moist and glandular skin with no external scales -They carry out gaseous by gills,lungs,skin and mouth -Reproduction is sexual -They have poisonous gland for defence -They have three chambered heart (2bii) -Flowers are dull coloured -Absence of scent -Flower have small,incouspicious petals/sepals -Pollen grain are small smooth light and not sticky (2biii) -Possession of succullent stems by desect plant to enable them store excess water -Possession of tiny and scanty leaves to reduce water loss through transpiration -Possession of extensive root system for anchorage water absortion ======================================== (3ai) Nutrition is defined as the intake of food that has all nutrients for growth and development (3aii) Mutation is defined as a change in the DNA configuration of a cell (3aiii) Gene is defined as the basic unit of inheritance.They carry characteristics or traits from parents to offspring (3b) The ray is reflected from the object into the pupil and iris.The rays travels through the cornea,lens,aqeous humour and vitreous humour and the image is formed on the retina.The image is then sent to the brain through the optic lobe of the brain Conjuctiva->Cornea->Iris&pulpil->aqeous humour->lens->Vitreous humour->Retina->Brain (3c) TABULATE Amoeba: -They have false foot -They are parasitic -They have singular nucleus Euglena: -They have flagella -They are holozoic -They have micro and mega nucleus (3cii) -Proper sewage disposal -Proper refuse disposal -Control of disease -Protection of food =================================== (4ai) -General weakness -Headache -Sore throat -Muscle pain -Diarrhea and nausea (4b) TABULATE Living thing: -They can move -They reproduce -They grow -They respond to stimulus -They excrete Non living: -Most do not move -They do not reproduce -They do not grow -They do not respond to stimulus -They do not excrete (4c) -Large cylindrical centrum -Large neural canal -Short tranverse process -Long neural spine (4b) DRAW THE DIAGRAM