CBSE Class 12 Biology Practical Syllabus 2018

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Dorsifixed: Filaments attached to the dorsal side of anther iii. Posterior petal is external and largest, it almost covers two lateral petals and lateral petals in turn overlap two smallest anterior petals e. Similarly relative percentage of different types f soil particle present in different soil samples was recorded.

Cross-pollination is preferred over self-pollination. Demerits of self-pollination: i The production of new varieties is inhibited ii The progeny gets gradually weakened. Central: Ovary multi carpellary, syncarpous but one chambered and placenta develop from the central axis e. Posterior petal is external and largest, it almost covers two lateral petals and lateral petals in turn overlap two smallest anterior petals e.

Biology Practical for Class 11 Practical Examination 2018

Put these funnels in a measuring cylinder Put the two soil samples in separate funnels The weight of soil sample should be same in both 25g Pour equal amount of water in both funnels 25ml Let the water drip in the cylinder Note the volume of water collected Test the two samples with pH indicator and note the observations. Aim: To study and identify the transverse section of testes and ovary through permanent slides. Requirements: Permanent slides of transverse section of Testes and ovary, microscope Observation: T. S of Mammalian Testes The mammalian testes are covered with a thick fibrous tissue called tunica albuginea The testes consist of a many seminiferous tubules embedded in the interstitial tissues. The interstitial tissue has Leydig cells which produce testosterone. The ovary consists of the outer cortex and inner medulla. The medulla consists many rounded or oval bodies called ovarian follicles at various stages of development. Aim: To study pollen germination on a slide. Apparatus and materials required: Fresh seasonal flower slides, microscope, beaker, cavity slide, boric acid, sucrose. Procedure: Prepare a nutrient solution by dissolving 10g sucrose and 10 mg boric acid in 100 ml biology practical class 12. Take a few drops of this solution on a clear slide, dust a few pollen grains from the stamen of a mature flower in it. Obverse the slide under the microscope after 5 minutes. Keep observing the slide regularly after intervals of half an hour. Observations: In a nutrient solution or nutrient-rich medium, the pollen grains germinate. The generative biology practical class 12 nucleus soon passes into it and dives to make 2 sperm nuclei male gametes. Each male gamete is lenticular to spherical in outline.

Put these funnels in a measuring cylinder Put the two soil samples in separate funnels The weight of soil sample should be same in both 25g Pour equal amount of water in both funnels 25ml Let the water drip in the cylinder Note the volume of water collected Test the two samples with pH indicator and note the observations. The pollen grain has two walls, i. Our main motive is to help students for examination. Androecium: Stamens 6 in two whorls of 3 each, filament short, anther-dithecous v. Pisum sativum Valvate Twisted Imbricate Quincuncial Vexillary Different types of aestivation in floral members Stigma: It is the apical end of the style i.