Tag: waec biology practical expo

WAEC BIOLOGY PRACTICAL ANSWERS 2020 CONFIRMED Here on this page you will see the answers both on pictures or on a written form. Do well to choose which is best for you... Zoom the pictures to have a clear glance, enjoy and good luck. We will keep updating it with relevant answers. Stay tuned : (1a) (i)Specimen A– Clayey Soil. (ii)Specimen B– A solution of one part of egg albumen mixed with two parts of water in a test tube/beaker. (iii)Specimen C— Mushroom (freshly plucked). [: 2dii) (choose any 2) i. Vitamin C ii. Potassium iii. Amino acid iv. Magnesium 2dii) (choose any 2) i. Vitamin C ii. Potassium iii. Amino acid iv. Magnesium : (2a) E: Succulent Fruit F: Berry/Flesh Fruit H: Legume/Pod (2b) E: Parietal Plancentation F: Axile Plancentation 8: (1a) (i)Specimen A– Clayey Soil. (ii)Specimen B– A solution of one part of egg albumen mixed with two parts of water in a test tube/beaker. (iii)Specimen C— Mushroom (freshly plucked). 1d(iii) Yeast Mushrooms Moulds Truffles 1e(i). Phylum Mollusca (2a) E: Succulent Fruit F: Berry/Flesh Fruit H: Legume/Pod (2b) E: Parietal Plancentation F: Axile Plancentation [ 8: (2a) E: Succulent Fruit F: Berry/Flesh Fruit H: Legume/Pod (2b) E: Parietal Plancentation F: Axile Plancentation (2c) E: Human F: Animal H: Explosive Mechanism 2dii) (choose any 2) i. Vitamin C ii. Potassium iii. Amino acid iv. Magnesium 2ei) green (1ai) TABULATE - TEST: Specimen B + 2drops of iodine solution - OBSERVATION: No precipitate is found (No reaction is occurring) INFERENCE: It indicates specimen B contains no starch content (1aii) TABULATE - TEST: Specimen B + 2ml of NaOH(aq) + 3 drops of CuSO4 + shake - OBSERVATION: The mixture will turn to purple or violet colour - INFERENCE: Protein is present (1b) (i) Test for starch (ii) Test for protein (Biurets test) (1c) - Additional income is obtained through quality mushrooms - They contain vitamins and proteins and Laos acts as antioxidants supporting the immune system (1di) Fungi (1dii) - Eukaryotic organism - Absence of chlorophyll - Cell walls made of chitin instead of cellulose (1diii) - Molds - Mildews - Smuts - Rusts - Yeast (1ei) Mullosca (1eii) - Presence of tentacles - Possession of soft and unsegmented bodies - Body is covered by a mantle and she'll - They are bilaterally symmetrical - They are triploblastic with three layers (1fi) - Specimen C (mushrooms) are decomposers breaking down surface waste releasing nitrogen back into the soil in form of ammonium nitrate, a nutrient essential for plant survival (1fii) Saprophytic mode of nutrition Use either loops, whorls or arches (4diii) Accidental, double loop, Tented arch fingerprints (4div) - It is highly accurate - Very useful in criminal identification - It is easy to use - It is unique and can never be the same for two persons (4dv) Morphological variation Okpe Christian: (4dii) Use either loops, whorls or arches (4diii) Accidental, double loop, Tented arch fingerprints (4div) - It is highly accurate - Very useful in criminal identification - It is easy to use - It is unique and can never be the same for two persons (4dv) Morphological variation Similarities Between Specimen F (tomatoes) and Specimen G (fresh pod of cowpea) Both have annual life cycle Both have seeds present They both have plantation present Differences Between Specimen F (tomato) and Specimen G (fresh pod of cowpea) Specimen f (tomato) Specimen G (fresh pod of cowpea) Specimen F Is a fleshy fruit while Specimen G is a dry dehiscent fruit Specimen F Has axial placentation while Specimen G has a marginal placentation Specimen F Mode of dispersal is by an animal while Specimen G Mode of dispersal is by explosive mechanism Specimen F have Absence of epigeal germination while Specimen G presence of epigeal germination Similarities Between Specimen E (pawpaw) and Specimen H (pride of Barbados plant) They both serves as a source of medicine Differences Between Specimen E (pawpaw) and Specimen H (pride of Barbados plant) Specimen E is a berry ( fleshy fruit) while Specimen H is a dry dehiscent fruit Aremu: Biology practical Diagram tricks for 2020 ✓ Title ✓ Quality • Neatness of Labels • Magnification • Size • Clarity of Lines ✓ Details • It depends on the specimen ✓ Labels Wishing you all outstanding success in your WAEC 2020 GIANT LAND SNAIL Phylum Mollusca Class Gastropoda Characteristics of mollusca Observable features Adaptive features Economic importance both beneficial and harmful effects. Habitat. ] Aremu: TRANSVERSE SECTION OF RIPE TOMATO FRUIT Type of placentation -- AXILE placentation. The carpels of a syncarpous ovary meet in the centre to form the placenta to which the ovules are attached. Types of fruit It is a true fruit It is a simple fruit. Develop from a syncarpous ovary It is a fleshy fruit It is a berry. The seeds are scattered within the mesocarp and the endocarp. Observable features of the specimen Observable or structural differences between pawpaw and tomato. Economic importance Nutritional benefits of tomato. Classification of the plant. Agent of dispersal. Animal, human MUSHROOM ( FRESHLY PLUCKED) It is a fungus. It belongs to the Psalliota spp. Habitat---- They may be found in woodlands, fields and farmlands Structure---- The spore bearing organ --- the sporophore --- is the familiar structure called a mushroom. The thick fleshy stem- like portion of the sporophore is called the STIPE which bear an umbrella-shaped cap called the PILEUS. The ANNULUS is the ring- like structure around the upper end of the stipe. It marks the place where the cap joined the the stipe before the cap opened up. The lower side of the pileus contains numerous plate- like structures radiating from its centre. These are called gills. Place the lower end of the mushroom in a basin of water and swirl it gently to wash of the soil. A network of hyphae - the mycelium which nature is hidden in the soil becomes visible. Use a handlens to examine the hyphae. Are they septate or non- septate. Divide the stipe transversely just above the annulus. Shake the gills over a sheet of white paper or tissue paper, if the mushroom is fresh and ripe a mass of spores will collect on the paper. Examine the spores with a handlens, what colour are they?? TYPE OF NUTRITION--- Saprophytic nutrition. They feed on dead and decaying organic materials. The association involving this type of nutrition is called SAPROPHYTISM. The saprophytes secretes enzyme unto the substrate ( rotten wood) of dead and decaying organic materials on which they grow. The enzyme digest some portion of the substrate outside the body by a process called extra cellular digestion. The digested food material on the substrate is then absorbed into the body through the hyphae or rhizoids ( Rhizopus). Other examples of saprophytes are rhizopus, mucor, toadstool and penicillium. Economic importance of mushroom Beneficial and harmful effects of fungi. Characteristics of fungi [ ]: TRANSVERSE SECTION OF RIPE PAWPAW FRUIT Type of placentation Parietal placentation -- The ovules are attached to the sides of a syncarpous ovary having a single chamber Placentation is the arrangement of seeds in a fruit. Agents of dispersal -- Animal, human. Features that aid the dispersal Type of fruit It is a true fruit i.e it develops solely from a fertilised ovary It is a simple fruit i.e it develops from a flower with a single ovary. The ovary is syncarpous ( i.e the carpels are fused together) as in okro and tomato. It is a flesy fruit( i.e the whole pericarp -- epicarp, mesocarp, endocarp --- or at least one of its layers is thick, soft and fleshy / succulent especially when ripe. Type of fleshy fruit--- BERRY. Other examples of berries are tomatoes, pepper etc. The peeicarp of a berry consists of three layers. Thin epicarp, succulent mesocarp and endocarp. It has only one chamber where the seeds are located. Other types of fleshy fruit --- DRUPE e.g coconut and mango HESPERIDIUM -- e.g orange, lemon. Pawpaw flower is a DIOECIOUS flower i.e the male and female flower are found on different plants. The plant is said to be dioecious. Economic importance of pawpaw Nutritional benefits of pawpaw. Structural differences between berry and drupe. Crop classification -- Agricultural classification and life cycle classification Aremu: Specimen E – Transverse Section of Ripe Paw Paw Botanical name of Specimen E : Carica papaya Classification of Specimen E It is classified as a type of fleshy fruit Structure of Specimen E It consist of three layers which are Epicarp Mesocarp and Endocarp N:B – The type of fleshy fruit of specimen E is berry Economics Important of Specimen E It has a high nutritive and medicinal value it is used in the production of cosmetic beauty product They are good source of potassium Mode of dispersal of specimen E Aremu: FRESH POD OF COWPEA PLANT. Cut longitudinally Types of placentation --- Marginal placentation. Ovules are attached to the placenta along one margin of the ovary. Types of fruit It is a true fruit It is a simple fruit. Develop from a monocarpous ovary. As in maize It is a dry fruit i.e type of fruit in which the pericarp becomes dry , hard and woody or fibrous when the fruit ripens. It is a dehiscent fruit i.e the fruit splits to release its seeds when ripe. Types of dehiscent fruit. It is a Legume/ Pod. LEGUME/POD A legume or pod is a simple fruit formed from a superior monocarpous pistil. It is usually long and flattened side ways. When the fruit is ripe the pericarp dehisces/ break longitudinally along both sides to release the seeds inside it. The seeds are usually arranged along one of the margins of the fruit ( marginal placentation ). Examples of legumes pride of Barbados, flamboyant. Nutritional benefits Structural or observale features. Crop classification. Aremu: Specimen H – Complete green pod of Pride of Barbados Plant The botanical name of Specimen H It Is Caesalpinia Pulcherrima Floral Part of Specimen H I. Sepals/calyx II . Petals / Corolla III. Stamen/androecium IV. Pistil / gynoecium Structure of specimen H Flower are conspicuous /large Brightly coloured plants / greens Stigma is sticky Domestic uses of specimen H it is used for beautification For medical purpose As a source f income Economic Importance of Specimen H Environmental; Ornamental Medicines Vertebrate poisons; mammals The symmetry of Specimen H Bilateral/Bilaterally Symmetrical (because it can be cut into equal halves along only one plane) Sex of Specimen H Hermaphrodite/bisexual ( because it has both pistil / male and female organs /androecium and gynoecium). Specimen H Diagram: Complete green pod of Pride of Barbados Plant Aremu: Economic Importance of Specimen D They eat very low on the food web they provide food for all sorts of mammals, birds earthworm e.t.c They cause great disaster to farmers crop they consume rotten vegetation like most leaf. Mode of the feeding of Specimen D Is by Scraping and they mostly feed on leaves and insect Sex of Specimen D They exhibit Hermaphrodite / Bisexual (The snail with bigger shell are mainly female) Specimen D Diagram: Gaint Land Snail Specimen of Gaint Land Snail Specimen of Gaint Land Snail Similarities Between Specimen F (tomatoes) and Specimen G (fresh pod of cowpea) Both have annual life cycle Both have seeds present They both have plantation present Differences Between Specimen F (tomato) and Specimen G (fresh pod of cowpea) Specimen f (tomato) Specimen G (fresh pod of cowpea) Specimen F Is a fleshy fruit while Specimen G is a dry dehiscent fruit Specimen F Has axial placentation while Specimen G has a marginal placentation Specimen F Mode of dispersal is by an animal while Specimen G Mode of dispersal is by explosive mechanism Specimen F have Absence of epigeal germination while Specimen G presence of epigeal germination Similarities Between Specimen E (pawpaw) and Specimen H (pride of Barbados plant) They both serves as a source of medicine Differences Between Specimen E (pawpaw) and Specimen H (pride of Barbados plant) Specimen E is a berry ( fleshy fruit) while Specimen H is a dry dehiscent fru Aremu: Source of Food of Specimen E Vitamin A and C Characteristics of Specimen E They have pleasant aroma The skin colour of Specimen E range from green to yellow. Specimen E can be easy press with your thumb. Specimen E Diagram: Transverse Section of Ripe Paw Paw 2020 Waec Biology practical specimen Answer 2020 Waec Biology practical specimen Answer Specimen D – Giant land Snail Habitat of Specimen D Specimen D lives in shrublands, agricultural areas, plantations, garden, wetland e.t.c Phylum – Mollusca Class – Gastropoda Observation Features that adapt Specimen D to its habitat Lungs – Adapt to on land habitat through the use of lungs that take in oxygen. Shells – for protection Tentacles – for vision and feelings Rasp tongue – for consumption and digestion Foots – for movement inland habitat Economic Importance of Specimen D They eat very low on the food web they provide food for all sorts of mammals, birds earthworm e.t.c They cause great disaster to farmers crop they consume rotten vegetation like most leaf. Mode of the feeding of Specimen D Is by Scraping and they mostly feed on leaves and insect Sex of Specimen D They exhibit Hermaphrodite / Bisexual (The snail with bigger shell are mainly female) Specimen D Diagram: Gaint Land Snail Specimen of Gaint Land Snail Specimen of Gaint Land Snail Similarities Between Specimen F (tomatoes) and Specimen G (fresh pod of cowpea) Both have annual life cycle Both have seeds present They both have plantation present Differences Between Specimen F (tomato) and Specimen G (fresh pod of cowpea) Specimen f (tomato) Specimen G (fresh pod of cowpea) Specimen F Is a fleshy fruit while Specimen G is a dry dehiscent fruit Specimen F Has axial placentation while Specimen G has a marginal placentation Specimen F Mode of dispersal is by an animal while Specimen G Mode of dispersal is by explosive mechanism Specimen F have Absence of epigeal germination while Specimen G presence of epigeal germination Similarities Between Specimen E (pawpaw) and Specimen H (pride of Barbados plant) They both serves as a source of medicine Differences Between Specimen E (pawpaw) and Specimen H (pride of Barbados plant) Specimen E is a berry ( fleshy fruit) while Specimen H is a dry dehiscent fruit

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Tag: waec biology practical expo

WAEC BIOLOGY PRACTICAL ANSWERS 2020 CONFIRMED

WAEC Biology Practical Questions and Answers 2020