2018 NECO BIOLOGY OBJ AND ESSAY

NECO 2018 - BIOLOGY* ENG NASER DAHER 💪💪💪💪💪💪 1d.An ecosystem includes all of the living things (plants, animals and organisms) in a given area, interacting with each other, and also with their non-living environments (weather, earth, sun, soil, climate, atmosphere). .. ENG NASER DAHER 💪💪💪💪💪 2ai a gene is a sequence of DNA or RNA which codes for a molecule that has a function. During gene expression, the DNA is first copied into RNA. 2aii Implantation: The act of setting in firmly. In embryology, implantation refers specifically to the attachment of the fertilized egg to the uterine lining, which occurs approximately 6 or 7 days after conception (fertilization). 2aiii a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial, e.g. Homo sapiens. 2aiv A saprophyte or saprotroph is an organism which gets its energy from dead and decaying organic matter. This may be decaying pieces of plants or animals. 4ai) diffusion is defined as the process by which molecules or ion move from a region of high concentrations to a region of low concentration until they are evenly distributed 3ai) i) Liver fibrosis ii) hepatitis iii)hemochromatosis 4aii) osmosis is defined as the process by which water molecules move from a region of dilute or wicker solution to stronger solution through a selectively or permeable membrane 4aiii) plasmolysis is defined as the outward movement or flow of water from a living cell when they are place in an hyoertonic solution 4bi) effect of over crowding are ; Aggressive behavior State of unrest Decrease in reproductive ability 4bii) conservation of wild life are; Indiscriminate killing of wildlife should be discouraged Deforestation which destroy the habitat of animal should be discouraged Killing of young developing animals should be allow ENG NASER DAHER 💪💪💪💪 4A OSMOSIS :: a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. PLASMOLYSIS contraction of the protoplast of a plant cell as a result of loss of water from the cell. Diffusion is the net movement of molecules or atoms from a region of high concentration to a region of low concentration as a result of random motion of the molecules or atoms [31/05 10:21 am] ENGR NASER DAHER: Bio-Obj 1BAEADBEEEC 11DADBDCDDDB 21ADECBCADAE 31DADAABCABA 41BCDADCECDD 51EABBDDCCBB [31/05 10:23 am] ENGR NASER DAHER: 3aii) Plant cell i) presence of cell wall ii) presence of chloroplast iii) Presence of sparse cytoplasm iv) presence of small vacuole v) Absence of centrosome Animal cell i) Absence of cell wall ii) Absence of chloroplasts iii) Presence of dense cytoplasm iv) Presence of small vacuole v) Presence of Centrosome Still remain ENGR NASER DAHER 💪💪💪💪💪