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100+ Free Botswana BGCSE Science Double Award (0569) Practice Questions
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Sample Botswana BGCSE Science Double Award (0569) Practice Questions
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1Which cell structure is present in a plant cell such as a palisade mesophyll cell, but absent in a human red blood cell?
A.Cellulose cell wall
B.Cell membrane
C.Cytoplasm
D.Mitochondria
Explanation: A cellulose cell wall is a rigid outer boundary present in plant cells that provides structural support and protection. Human red blood cells lack cell walls and mature red blood cells also lack nuclei, but they possess a cell membrane and cytoplasm.
2By which process does water enter a plant root hair cell from the surrounding moist soil?
A.Active transport
B.Osmosis
C.Diffusion
D.Translocation
Explanation: Osmosis is the net movement of water molecules from a region of higher water potential (dilute soil solution) to a region of lower water potential (concentrated cell sap) across a partially permeable membrane. Root hair cells absorb soil water primarily through osmosis.
3A student tests a sample of egg albumen using Biuret reagent. What color change confirms the presence of protein?
A.Blue to brick-red
B.Blue to purple
C.Yellow-brown to blue-black
D.Colorless to milky-white emulsion
Explanation: Biuret reagent turns from blue to purple (or violet) in the presence of proteins due to peptide bonds reacting with copper ions in alkaline solution. A positive Biuret test indicates protein content.
4What happens to the active site of an enzyme when it is heated far above its optimum temperature?
A.It expands to fit any substrate molecule
B.It denatures and loses its specific 3D shape
C.It reproduces to form new enzymes
D.It becomes permanently freeze-dried
Explanation: Excessive heat causes thermal agitation that breaks hydrogen and ionic bonds stabilizing the enzyme's tertiary structure. This denatures the active site, altering its complementary shape so the substrate can no longer bind.
5Which mineral ion is essential for green plants to synthesize chlorophyll?
A.Calcium
B.Magnesium
C.Sodium
D.Iron
Explanation: Magnesium is the central atom in the chlorophyll molecule. A deficiency of magnesium ions leads to chlorosis, where leaves turn yellow due to lack of chlorophyll.
6Which deficiency disease results from a lack of Vitamin C in the human diet?
A.Rickets
B.Scurvy
C.Anemia
D.Goiter
Explanation: Vitamin C (ascorbic acid) is necessary for collagen synthesis. Deficiency of Vitamin C leads to scurvy, characterized by bleeding gums, weak connective tissues, and poor wound healing.
7What is the main function of xylem tissue in flowering plants?
A.Transporting sucrose from leaves to roots
B.Transporting water and mineral ions from roots to leaves
C.Carrying hormones from flowers to seeds
D.Storing starches in the stem
Explanation: Xylem vessels consist of hollow, lignified dead cells that transport water and dissolved inorganic mineral salts unidirectionally from the roots up to the stems and leaves.
8Which constituent of human blood is specialized for transporting oxygen?
A.White blood cells
B.Red blood cells
C.Platelets
D.Blood plasma
Explanation: Red blood cells (erythrocytes) contain the iron-rich protein hemoglobin, which reversibly binds oxygen to form oxyhemoglobin, transporting oxygen from lungs to respiring tissues.
9Which equation correctly represents aerobic respiration in human cells?
A.Glucose -> Lactic acid + Energy
B.Glucose + Oxygen -> Carbon dioxide + Water + Energy
C.Carbon dioxide + Water -> Glucose + Oxygen
D.Glucose -> Ethanol + Carbon dioxide + Energy
Explanation: Aerobic respiration breaks down glucose completely in the presence of oxygen to yield carbon dioxide, water, and a large amount of ATP energy: C6H12O6 + 6O2 -> 6CO2 + 6H2O + Energy.
10Which organ in the human body is responsible for filtering urea from the blood to produce urine?
A.Liver
B.Kidney
C.Bladder
D.Pancreas
Explanation: The kidneys filter blood through nephrons to remove metabolic waste products such as urea, excess salts, and water, forming urine.
About the Botswana BGCSE Science Double Award (0569) Practice Questions
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