7 April 2013

biology practical cont...

SPECIMEN F SPECIMEN F is freshly perserved Toad. Habitat of specimen F is terretrial-aquatic. Respiratory organ: lungs,skin,gills,& buea cavity. Class of specimen F is amphibian. Parental care= none. Reproduction= sexual. Fertilization= external. Excretory organ= kidney. Mode of nutrition= carnivores,during adult stage & herbivore during tadpole stage. ********************** ----DIAGRAM---- structure of specimen F ************************ STAGES OF DEVELOPMENT OF SPECIMEN F specimen F undergoes various stages of development which are (a)courtship stage (b)the egg stage (c)the young tadpole stage (d)the external gill stage (e)the internal gill stage (f)the limb stage (g)the young toad stage. METAMORPHOSIS of specimen F SPECIMEN F undergoes imcomplete metemorphosis,that is from egg->tadpole- >adult. Metamorphosis is the series of gradual charges of forms & shape of an insect from the fertilised egg to adult. EFFECTS OR ROLE OF HORMONE IN THE DEVELOPMENT OF TOAD(SPECIMEN F) In the specimen F,metamorphosis is controlled by the hormone called thyroxin,tyroxin lastens the rates of metamorphosis. CHARACTERISTICS OF SPECIMEN F (a)possesion of bulg eye (b)possesion of poisonous gland (c)specimen F exibit dual life (d)absense of neek (e)possesion of webbed limbs ADAPTATION OF SPECIMEN F IT'S HABITAT (a)possesion of poisonous glands for defence (b)presence of long sticky tongue for capturin of prey (c)possesion of webbed limbs for swimming (d)possesion of tympanic membrane for recieving sound (e)absense of tail for easy hopping. ECONOMIC IMPORTACE OF SPECIMEN F (a)it destroyed some equatic weeds during tadpole stage (b)it reduce the effect of structural adaptative of insects. (c)it serve as a food to terrestrial organism eg hawk,snake e.t.c (d)it also serve as food to some aquatic species SPECIMEN G1 Specimen G1 is water leaf plant with fleshy stem *************************** ----DIAGRAM---- The stucture of specimen G1 *************************** ----DIAGRAM---- traverse sector of the stem specimen G1 *************************** STRUCTURAL ADAPTATIVE OF SPECIMEN G1 (a)possesion of taproot system (b)possesion of lenticells (c)pressure of hair root (d)possesion of succulent leaves DIFFERENCES BETWEEN MONOCOT & DICOT MONOCOT (a)Possesion of narrow cortex (b)absense of cambium (c)possesion of fibrous root system (d)possesion of broad leaf tip DICOT (a)possesion of wide cortex (b)presence of cambium (c)possesion of taproot system (d)possesion of pointed leaf tip SPECIMEN G2 specimen G2 is water leaf plant with fleshy stem (left in eosin solution for minimum of six hours). An experiment to show that the xylem tissue conducts water upwards from the roots through the stem to the leaves. AIM OF THE EXPERIMENT to show that the xylem tissue conducts water upwards from the roots through the stem to the leave METHOD OF THE EXPERIMENT A young herbacous plant (specimen G2)is uprooted,washed & placed in a beaker containing eosin solution(red ink)the roots must be completely coverd by the soluion (eosin)leave the set UP for about six hours at the end of six hours,the plants is broughtout & washed in a tap water.transver section of the roots, stems,7leavesof the plant are made & examined under a microscope . OBSERVATION-The xylem vessels are staird red CONCLUSION-it showsthat the xylem tissue conducts water in plant

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