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Biology practical Specimen☝

BIOLOGY OBJ ANSWERS 01-10: CCCBBBADAC 11-20: ACCBBDAADC 21-30: DCADDABDDA 31-40: ACCAACACCD 41-50: BBCAADCBBB COMPLETED

1a) (1ai) (PICK ONE) (I)Filtration of blood to form urine. (I) Regulation of blood pressure by controlling filtration rate. (III) Removal of waste products from the blood. (1aii) (PICK ONE) (I) Collects the filtrate from the glomerulus. (II) Prevents large molecules such as proteins from entering the tubule. (III) Initiates the process of urine formation. (1aiii) (PICK ONE) (I) Reabsorption of glucose, amino acids, and water from the filtrate. (II) Secretion of hydrogen ions and organic acids into the filtrate. (III) Regulation of pH balance by reabsorbing bicarbonate ions. (1aiv) (PICK ONE) (I) Regulation of potassium and sodium ions through reabsorption and secretion. (II) pH regulation by secreting hydrogen ions and absorbing bicarbonate ions. (III) Reabsorption of water and calcium ions under hormonal control. (1b) COMING SOON (1c) (PICK FIVE) (i) Oxygen (ii) Carbon dioxide (iii) Water vapor (iv) Organic acids (e.g., citric acid) (v) Ethylene (vi) Resins (vii) Latex

Biology questions

Chemistry Essay-by https://t.me/ExamloadedCEO (1a) An electrochemical cell is a device that converts chemical energy into electrical energy or vice versa. It consists of two half-cells, each containing a electrodes (an anode and a cathode) immersed in an electrolyte, which facilitates the flow of ions between the electrodes. (1b) (i)Spontaneity: Electrochemical cells are spontaneous, meaning they generate electricity on their own, while electrolytic cells require an external power source to drive the reaction. (ii)Direction of Electron Flow: In electrochemical cells, electrons flow from the anode to the cathode, while in electrolytic cells, electrons flow from the cathode to the anode. (iii)Purpose: Electrochemical cells are used to generate electricity, while electrolytic cells are used to drive non-spontaneous reactions, such as electroplating or water splittings. (1c) (i)The blue color of the copper sulfate solution starts to fade as zinc replaces the copper. (ii)Solid copper begins to precipitate out of the solution, forming a reddish-brown deposit at the bottom of the beaker. (iii)The solution might gradually become colorless if all the copper ions are replaced. (iv)Bubbles of hydrogen gas may be observed if the zinc is in excess, indicating the occurrence of further reactions involving the zinc and the sulfate or the acidic solution. (1di) CH4(g) -> C(s) + 2H2(g) (1dii) Decomposition reaction (1e) (i) hydrogen chloride (HCl) (ii)sulfur dioxide (SO2). (1f) (i)high temperature (ii)presence of a catalyst (iii)longer hydrocarbon chain length. (1g) Noble gases are chemically inert because they have a completely filled outer shell of electrons, making them very stable and unlikely to react with other elements. (1h) (i)Members have the same general formula (ii)Members have similar chemical properties (iii)Members have a gradual change in physical properties (iv)Members have a constant difference in molecular formula between successive members (1i) Global warming refers to the long-term rise in the average surface temperature of the Earth due to the increasing levels of greenhouse gases in the atmosphere. (j) increasing levels of carbon dioxide (CO2) in the atmosphere, primarily due to fossil fuel burning, deforestation, and land-use changes.

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