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embryo l.s.Manilkara zapota External Morphology Lab Work 1. A.Gross Morphology of Seed 1.Examine dry and germinating seeds of bean and Ricinus. 2.Study their external features, locate the distinct parts present. 3.Remove the seedcoat and take note of embryo parts and storage tissue present. a)Name the external visible features in bean seed.
Exercise 10. The Seed b)Do the same for castor bean. c)Distinguish the storage tissues present in each. d)What occupies the greater bulk of the seed of bean? Of castor bean? e)Based on storage tissue present, what term is used for describing each of them? 4.Draw and label the ff: a)External features of Ricinusseed. b)Split bean seed showing position of embryo. B.Parts of the Embryo Monocot Embryo: 1.Examine soaked grain of corn. Compare this with bean seed and castor bean seed. What external features of the seed are visible in corn grain? Why is it called a fruit and a seed? 2.Make a longitudinal cut through the grain. The yellow portion, the endosperm constitutes the bulk of the grain. The endosperm consists of an outermost layer of cells, the aleurone layer. An inner mass of cells, the starchy endosperm makes up the greater part of the corn grain. 3.Attached to the endosperm towards the base is the embryo. 4.Make a drawing of a corn embryo seen at longitudinal view. Label fully all parts Dicot Embryo: 1.Examine a germinating dicot seed. 2.Locate the embryo and identify the parts: epicotyl, hypocotyl, cotyledons). 3.Draw and label the parts, including the storage tissue, seedcoat and other external features. C.Seed Germination and Seed Development 1.Examine germinated mungbean seeds and take note of the ruptured testa, cotyledons, massive primary root and emerging hypocotyls. 2.Observe that the hypocotyl-root axis exhibits the most rapid initial growth rate. 3.Explain why this is important to seedlings. 4.Examine seedlings of mungbean at different stages of development. In the light, the cotyledon 2