Question

a)i)Analyse the conversion process of pepsinogen to pepsin. (Smarks) li)lllustrate a labelled diagram of a motor neuron. (5marks) lī)Construct labelled diagrams of sacromes to show the relaxation and contraction of muscle. (5marks) Iv)Illustrate the cross-section of three (3) types of ground tissue. (5marks)

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Answer 1

Dicotyledon Root . Protoxylem (QC) 1) Using a diogram, cliffesentiate between the anatomy of dichlyledon and monocotyledon tood Answer: Monocotyledon root. • Rool hair Root hair *I piblend Folie Epiblema Exadermis • Exodermis • Coltex • Cortex, Conjuctive tissue • Meta xylem Endodermis • Phloem • Pericycle. Enclodem Metaxylem • Percycle •Phloem Protoxylem • Pith fig: TS of Dicat Root fig: T.s of Monocot Root o Conjundive tissue is © Conjucive tissue is mostly Pareñ'chymatous. Ils cells Selesenchymatous. It is never are differentiated into differentided into vasculus vascular cambium. cambium e Piath is patiow & poolly e Pithis well developed I developed large. © Limited number of xylem 3 More number of xylem and Phloem skrips piesedte and phloem sluip pidend. © Xylem is tetrach. 4 Xylem is polyarch. e Secondary grouoth is present Secondary growth is absen!

placrophage. fig: Areolar II) Illustrate oreolar connective tissue with a labelled die Answers Reticular [fibers •Matrix Fibroblast Ground •Collagen tibles substance • White blood cells. • Elastic fibres Past cells. Connective tissues Areolai connective tissue is made up of cells $ extracellular matrix. The connective tissue contains common cell type jie tinieblast, but it also contain monophaces, flast cells white blood cells. I and fibres. The three types of fibres in creolar Made by has two components Le Clound substance connedive tissue ,ie Collagen bien Elastic fibre of Relicular fibres s' Cound Substance till the between cells and tihers. spaces III) Constuct labelled diogiam of sarcomeres to show the relaxation and conduction of musde. Answer Actine filument Actine filament - Mybkie Actine Myosine tilament for tilament tilament, LUZ pa सार H zone 'Il band Z line fig: Sacomer Relaxed fig. Hżone shorten I'band 2 line short Sarcomer Contracted state state