Sepecialized Cells(e) What does specialized cells mean? Name a specialized cell
(3) ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… 5 (a) Life of a multicellular organism begins from a single cell. I.e. zygote. All the cells in a living body arise from the zygote by a process of cell division? Name the process
(1) ……………………………………………………………………………………… (b) Some specialized cells are given below. Describe functions of each in the human body.
(8) (i) Muscle cell ……………………………………………….. (ii) Nerve cell ……………………………………………….. (iii) Red blood cell ……………………………………………….. (iv) Lymphocytes ……………………………………………….. (v) Egg cell ………………………………………………... (vi) Ciliated cells ……………………………………………….. (vii) Lymphocytes ………………………………………….. (viii) Sperm cell ………………………………………….. (c) Draw and label diagrams of cells given in 5(b) from (i) to (viii).
(8)6 Some structural features of the cells are given below. For each of the feature explain how it is suited to help function the cell. (a) Nerve cell
(i) Length ……………………………………………………………………………………… (ii) Mylein sheath ……………………………………………………………………………………… (iii) Nodes of ranvier ……………………………………………………………………………………… (iv) Cell body ………………………………………………………………………………………
(4) (b) Ciliated cell
(i) Cilia ……………………………………………………………………………………… (ii) Cytoplasm ………………………………………………………………………………………
(2) (c) Sperm cell
(i) Tail ………………………………………………………………………………………(ii) Haploid nucleus ……………………………………………………………………………………… (iii) Pointed head ……………………………………………………………………………………… (iv) Large number of mitochondria ………………………………………………………………………………………
(4) (d) Phagocyte
(i) lobed nucleus …………………………………………………… (ii) cytoplasmic projection/ pseudopodia ………………………………………………………………………… (iii) enzymes in the cytoplasm ……………………………………………………………………… (iv) cytoplasm ………………………………………………………………………………………
(4) (e) Muscle cell
(i) contractile proteins, actin and myosin ………………………………………………………………………… (ii) Length ……………………………………………………… (iii) Cytoplasm ……………………………………
(3) (f) Red blood cell
(i) flat, disc shape ……………………………………………………………………… (ii) haemoglobin …………………………………………………………………………… (iii) lack of nucleus ………………………………………………… (iv) spongy haemoglobin ………………………………………………………
(4) (g) Egg cell
(i) Large size ……………………………………………………………………………………… (ii) Food reserve in the cytoplasm ……………………………………………………………………………………… (iii) Haploid nucleus ………………………………………………………………………………………
(3) (h) Lymphocytes
(i) spherical shape ……………………………………………………………………………………… (ii) large spherical nucleus ……………………………………………………………………………………… (iii) surface membrane ………………………………………………………………………………………
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