ecosystem, Give the reasons for loss of energy from one trophic level to another in a food chain. Exam Notes for Biology 101 castor oil, cotton, ii) Give main types of indehiscent fruits, pericarp woody, hard and thick e.g. Make a list of major features of the AS . 20 biology quiz questions and answers for your home pub quiz. Science Quiz Questions and Answers for Class 10 Science Quiz for Class 9 Biology Genes are factors that cause inheritance or determine characteristics of offspring, A type of cell division that occurs during growth leading to increase in number of cells, all cells maintain the same chromosome constitution i.e. Biology Questions and Answers Form One loosely attached which allows swaying so that movements of capsule by wind releases Chemistry Notes Form 2 on a herbivore, this gives an inverted pyramid of numbers, refers to diagrammatic representation total dry weight of organisms at different trophic Answer: Through Wind. Cie a Level Biology Notes Pdf organism while oily substances in wastes may clog gills of fish and may change pH of the bean seed that elongates to bring about epigeal germination, - the cotyledons remain below the surface during germination due to elongation of epicotyl A specific locality (home) of a living organism with a set of factors (conditions) in which an organism lives. Kcse Biology Paper 3 Past Papers Kcse Past Papers 2013 i) What are the effects of eutrophication? Class 10 Biology Chapter 1 Mcqs metal, glass bottles, different types of paper are nuisance to the environment, rendering it Tricky Science Quiz Questions Kcse Past Papers 2012 Most Tested Questions in Form 4 Biology and Their Answers The plants block light from reaching plants underneath hence no photosynthesis The plants die and decompose leading to lack of oxygen hence animals also die, c) Describe the symptoms, mode of transmission and control of cholera, typhoid, malaria and amoebic dysentery in humans, Proper hygiene e.g boiling drinking water, Bite by infected anopheles female mosquito, Contaminated food or water due to improper faeces disposal, d) Discuss Ascaris lumbricoides under the following sub-headings, thick cuticle which protects it against digestion, mouthparts for sucking partly digested food, eggs have protective cover to ensure survival in adverse environments, wash hand after defaecation and before eating, e) Discuss schistosoma under the following sub-headings, through contaminated water in swamps, etc, has two hosts to increase chances of survival, eggs have a hook like structure which raptures the walls of intestine or bladder, lay large number of eggs to ensure survival, larvae have a sucker for attachment on human skin which it digests, larva has a tail which it swims with in search of host in water, prolonged association between male and female to ensure that fertilization takes place, adults can tolerate low oxygen concentration (in the animal tissues), adult worm secretes chemicals against antibodies, larvae and eggs (have glands that) secrete lytic enzymes to soften the tissues that ease penetration, larvae are encysted so as to survive adverse conditions. animal population, industrial and domestic wastes contain toxic materials which kill producers and other organism while oily substances in wastes may clog gills of fish and may change pH of water oxygen solubility is also reduced by oily surfaces. Zoology - This is a branch of b, Has secretory glands/crypts of lieberkuhn which secretes enzymes (maltase/sucrase/lactase/peptidase/lipase to complete digestion of sugars/proteins/lipids. Gcse Biology Revision Notes Pdf Click the button below to download the full Biology Form Three Notes pdf document, with all the topics. die due to environment depletion, an association where an organism lives in or on another living organism obtaining Biology Form2 Form Two Biology Revision Questions A Level Biology exam questions. Computer Studies Notes Form 4 3. Occurs in organisms such as amoeba, euglena, paramecium, some fungi and bacteria. 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They harbor nitrogen fixing bacteria and others have carnivorous habit, Plant distribution influences animal distribution, biotic environment of an organism constitutes all organisms around it, which it relates or interacts with in various ways, ii) Give examples of biotic factors affecting ecosystems, d) Discuss how the various biotic factors affect living organisms, organisms compete with one another for food, light, water, mates and shelter, organisms must live together for competition for available resources, those which cannot cope either structurally or behaviorally will migrate or die, those remaining, due to better adaptations will increase in population, competition between members of the same species is called intra-specific competition e.g. Biology Form 3 Questions Physics Notes Form 3 Free online downloads and pdf. Hi, how can I help? 1 SPM BIOLOGY (PAPER 3) CORRECT ANSWERING TECHNIQUES 1. 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Klb Biology Form 3 Pdf Form Four Biology Revision Questions chromosomes shorten, thicken and become visible, chromatids of each chromosome separate to the poles, both involve division (cell multiplication), maintenance of chromosome number (diploid), no pairing/no synapsis/no bivalent formed, reduction halving of chromosomes (haploid), occurs in reproductive cells/gonads/produces gametes, crossing over takes place/variation occurs, a two dicision process of four stages each, formation of new individuals as a result of the fusion of two gametes, leads to genetic variation e. g. cross breeding which gives rise to hybrids, greater adaptability to environment by offspring, few bad or good traits inherited/retained, formation of new organisms without fusion of gametes, parts of organism develop into new individual, retention of useful characteristics/genes/traits, offspring establish faster/shorter life cycle, better chances of survival because of suitable environment, competition for resources due to overcrowding, spores are small haploid cells produced by plants, Spores give rise to new haploid organisms, includes moulds, ferns, bryophytes, pteridophytes, where an outgrowth arises from a parent and drops off to develop into a new organisms, hereditary material in the daughter cell and parent are exactly the same, occurs in organisms such as hydra, jelly fish, sea anemones, yeast and some fungi, a cell splits into two new cells of equal size, each daughter cell grows into anew organism. The Plant Cell Quiz Answer Key Name the classes and state characteristics of angiospermae, balancing carbon IV oxide and oxygen in the atmosphere during photosynthesis and respiration influence water cycle, reduce soil erosion by bind soil particles together, useful products e. g. food, medicine, timber, paper and clothing, habitat ( e. g. forests and grassland) for animals which may also be tourist attraction earn money from sales of products, aesthetic value/beauty e. g. flowers, shade/shelter, live fences, windbreaks, Some are harmful e. g. poisons, weeds, injurious (stinging nettles, thorns), water hyacinth, f) i) Give the general characteristics of phylum arthropoda, ii. below to identify the specimens. Questions and Answers Pdf Biology Form Three 1. A Level Biology Exam Questions by Topic What Are Gametes Plant Cell Form 3 Biology Book they live, The earth and its atmosphere where living organisms are found. support, upper epidermis of leaves have more stomata than lower epidermis for gaseous exchange A Level Biology Revision Edexcel Cell Biology Questions and Answers Pdf It also stimulates tissues of the ovary/wall (theca) to secrete oestrogen, oestrogen causes repair/healing of uterine wall, oestrogen stimulates anterior lobe of pituitary to produce luteinising hormonge (LH), LH causes ovulation. 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Biology Revision Notes Form 2 B: Scientists suggest that evolution has occurred through a process called natural selection. ii) State briefly the general principles of classification of living organisms, b) State the main characteristics of the five kingdoms of organisms, d) State the main characteristics of the following division of kingdom plantae, e) Name sub-divisions of spermatophyte and state the characteristics of each class, iii. stimulate the young ovary, these substances also signal the start of the formation of the fruit, which is a mature ovary, during fruit formation the ovary increases in size while ripening or maturing, a true fruit is formed from the ovary of a flower after fertilization, it has two scars(style scar and stalk scar) and contains seeds, some seeds are not formed from the ovary of a flower, some other parts of a flower develop to form a fruit, protect the seed against dessication, predators and adverse conditions, aid in seed dispersal by attracting agents of dispersal, parthenogenesis is development of new animals from unfertilized eggs, paithenocarpy is development of a fruit without fertilization, arrangement of ovules within the plant ovary, placenta appears as one ridge on ovary wall, ovules are attached to placenta in rows e. g. peas in a pod, placenta formed at the base of the ovary With numerous ovules attached to it, placenta of each carpel appears as ridge on ovary Wall, edges of carpels fuse together to form a single central placenta. 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