Biology practical class 12. Biology 2018-07-04

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MANDAL'S DESK: BIOLOGY PRACTICAL CLASS XII CBSE WITHOUT DIAGRAM

biology practical class 12

Gamopetalous, rotate, five lobed Q. Give the technical term for the characteristic sculpturing or design on the surface of the pollen grain. Vexillary:Typical aestivation of papilionaceous corolla. What is the number of chromosomes in the generative nucleus? In an act of double fertilization, one of the two sperm cells within the pollen tube fuses with the egg cell of the ovule, making possible the development of an embryo, and the other cell combines with the two subsidiary sexual nuclei of the ovule, which initiates formation of a reserve food tissue, the endosperm. Bicarpellary: flower with two carpels iii. Monocarpellary: flower with one carpel ii.


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practical file for class 12

biology practical class 12

Take fresh flower to dissect out the floral parts 2. . Rafflesia flowers biggest in the plant kingdom are reported to be pollinated by elephants. The pollen grain has two walls, i. See our and for details.


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Biology Class 12 Syllabus

biology practical class 12

Flower: Pedicellate, regular, pentamerous, bisexual, hypogynous, large, ebracteate, actinomorphic, complete. Bracteate, Ebracteate, Sessile, Pedicellate, Incomplete, Trimerous, Tetramerous, Pentamerous, Actinomorphic, Zygomorphic, Asymmetrical, Bisexual, Unisexual, Staminate, Pistillate, Hypogynous, Perigynous, Epigynous. The tube nucleus descends to the tip of the pollen tube. I recently had my practical and the external was worst. Observe the section under dissecting microscope. Here is my paper : Viva can be asked mostly from the investigatory project.

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Biology Practical for Class 12 Practical Examination and Viva Voce,Tips Evaluation...

biology practical class 12

Individual member of perianth is called tepal. Monothecous: When there is only one anther lobe. Corolla: Petals 5, polypetalous, cruciform vi. Comment upon the morphological adaptations. Central: Ovary multi carpellary, syncarpous but one chambered and placenta develop from the central axis e. Study pollen germination on a slide.

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Biology

biology practical class 12

If you continue browsing the site, you agree to the use of cookies on this website. It is commonly globular in outline, though several other shapes are also found. Tricarpellary: flower with three carpels iv. This adaptation increases the chances of self- pollination though it is not obligatory. The generative cell also passes into it.

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CBSE Class 12 Biology practical exam tips

biology practical class 12

Adnate: Filaments runs up from base to the apex i. Gynoecium: Bicarpellary, syncarpous, ovary bilocular with axile placentation. Chapter-9: Strategies for Enhancement in Food Production Improvement in food production : Plant breeding, tissue culture, single cell protein, Biofortification, Apiculature and Animal husbandry. Two funnels were taken and were line with filter paper. The water of the cotton is drained off and spread over the mouth of funnel in such a way that it acts as filter. Comment upon their morphological adaptations.

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Biology Text Book ” Lab Manual Biology” for Class 11 NCERT E

biology practical class 12

Chapter-14: Ecosystem Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy; nutrient cycles carbon and phosphorous ; ecological succession; ecological services - carbon fixation, pollination, seed dispersal, oxygen release in brief. Pollen grains are the haploid male gametophytes of plants. A small piece of broad range pH paper was dipped in each of the soil solution. Self-pollination involves the transfer of pollen within same flower or different flower of the same plant. Biol ogy Practical Handb ook Lathyrus sweet pea i. To which family onion belongs? How many nuclei are present in pollen grain? The outermost sculptured protective layer of pollen wall is called exine.

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CBSE Class 12 Biology Practical Syllabus 2018

biology practical class 12

Comment upon their morphological adaptations. Two, the larger one is vegetative or tube nucleus and the smaller one is the generative nucleus. Pollen tube carries vegetative nucleus and gametes. The syllabus for the practical exam for class 12 is designed by the Central Board of Secondary Education which is one of the most prestigious educational board in India. Biology practical syllabus Evaluation scheme Maximum Marks: 30 One major experiment 5 One minor experiment 4 Slide preparation 5 Spotting 7 Practical record + viva voce 4 Project record + viva voce 5 Total 30 marks List of Experiments 1.

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Biology Practical Class XII Archives

biology practical class 12

Each solution was filtered off in different test tubes. Appropriate appendices related to the observation and study of organisms are given along with the experiment. Intine is pecto-cellulosic in nature and exine is made of a highly resistant fatty substance called sporopollenin. Identification of stages of gamete development i. Locules in the ovary i. Each male gamete is lenticular to spherical in outline. Take the section of ovary with the help of a blade.

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Biology Practical for Class 11 Practical Examination 2018

biology practical class 12

Name the branch of science which deals with it. Gamopetalous: Petals are united with each other Perianth: Calyx and corolla are not differentiated and called as perianth. A modified shoot meant for reproduction is called flower. Synandrous: When all the stamens as well as filaments are united to form a compound structure. Biol ogy Practical Handb ook Pentalocular: with five locules Multilocular: with many locules Ovary wall Ovules Locules Placenta Locules Unilocular Locules Bilocular Trilocular Tetralocular Pentalocular Types of ovaries based on the number of locules Placentation: The arrangement of ovules in the chamber of the ovary is called placentation. To 1 ml of saliva 19 ml of water is added for dilution of the enzyme.

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