Female part of the flower } Reproductive organ Observation: Draw and label the parts of the flower. Accessory organ . MENDEL'S MONOHYBRID CROSS Aim: To study the monohybrid cross by using model / picture / photograph. To find out the phenotypic ratio and genotypic ratio in pea plant using checker board Note: Depict parental generation and the gametes using colour chalk pieces Definition: Cross involving one pair of contrasting characters is called monohybrid cross.
Procedure: . Pure breeding tall plant is crossed with pure breeding dwarf plant. . All the F1 hybrid plants were tall (Tt) .
Selfing the F1 hybrid plants resulted in tall and dwarf plants in F2 generation. TT T Tt Tt × Tt (Heterozygous tall) selfing tt (Dwarf) Parents: (Pure tall) Gametes: F Monohybrid F generation: T TT tall Tt tall Tt tall tt dwarf T t t t Result: Phenotypic ratio = Tall - : Dwarf - Genotypic ratio = Pure Tall - : Hybrid Tall - : Pure Dwarf - Practicals Aim: To observe transverse section (T.S) of Dicot Stem / Dicot Root from permanent slides. Observation: A. The given slide is identified as T.S of Dicot Stem Reasons (i) Vascular bundles are arranged in a ring.
(ii) Conjoint, collateral, endarch and open vascular bundle. (iii) Ground tissued differentiated into cortex, endodermis, pericycle and pith. (iv) to layer of collenchymas tissues present in hypodermis. Observation: B.
The given slide is identified as T.S of Dicot Root Reasons (i) Vascular bundle are radial (ii) Xylem is exarch and Tetrarch (iii) Casparian strips and passage cells are present in endodermis (iv) Cortex is made up of parenchymatous cells . OBSERVATION OF TRANSVERSE SECTION OF DICOT STEM AND DICOT ROOT Pericycle Casparian strip Phloem Endodermis Root hair Piliferous layer Cortex Passage cells Xylem Pith Xylem Cambium Phloem Endodermis Parenchyma Chlorenchyma Collenchyma Epidermis Cuticle Epidermal hair BIO-ZOOLOGY . OBSERVATION OF MODELS-HUMAN HEART AND HUMAN BRAIN Identification of longitudinal section ( L.S)