Instruction: Choose the correct answer from options A–D. Try all the questions before checking the answer key.
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Which organelle is responsible for controlling the activities of a cell?
A. Ribosome B. Nucleus C. Vacuole D. Mitochondrion
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Which structure controls the movement of substances into and out of a cell?
A. Cell wall B. Cytoplasm C. Cell membrane D. Nucleus
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Which organelle is mainly responsible for aerobic respiration?
A. Chloroplast B. Ribosome C. Mitochondrion D. Vacuole
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Which structure is present in a plant cell but absent in an animal cell?
A. Cell membrane B. Cytoplasm C. Nucleus D. Cell wall
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What is the main function of chlorophyll?
A. Absorb mineral salts
B. Absorb light energy
C. Transport water
D. Store proteins -
Which process involves the movement of water molecules through a selectively permeable membrane?
A. Diffusion B. Osmosis C. Active transport D. Transpiration
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Movement of particles from a region of higher concentration to a region of lower concentration is called
A. osmosis B. diffusion C. active transport D. plasmolysis
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Which process requires energy from respiration?
A. Diffusion B. Osmosis C. Active transport D. Simple diffusion
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Which of the following is a product of photosynthesis?
A. Carbon dioxide B. Oxygen C. Urea D. Nitrogen
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Which gas is required by green plants for photosynthesis?
A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen
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Which substance is tested for using iodine solution?
A. Protein B. Fat C. Starch D. Vitamin C
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What colour does iodine solution turn in the presence of starch?
A. Red B. Blue-black C. Green D. Yellow
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Which enzyme begins the digestion of starch in the mouth?
A. Pepsin B. Lipase C. Amylase D. Trypsin
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Where does most absorption of digested food take place?
A. Stomach B. Large intestine C. Small intestine D. Oesophagus
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What is the main function of the villi in the small intestine?
A. Produce bile
B. Increase surface area for absorption
C. Store faeces
D. Digest proteins -
Which enzyme digests proteins in the stomach?
A. Amylase B. Pepsin C. Lipase D. Maltase
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Which organ produces bile?
A. Pancreas B. Liver C. Stomach D. Kidney
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What is the main function of bile in digestion?
A. Digest proteins
B. Digest starch
C. Emulsify fats
D. Absorb glucose -
Which blood cells are responsible for transporting oxygen?
A. Platelets B. Red blood cells C. White blood cells D. Plasma cells
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Which pigment gives red blood cells their colour?
A. Chlorophyll B. Haemoglobin C. Melanin D. Carotene
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What is the main function of white blood cells?
A. Transport oxygen
B. Fight disease-causing organisms
C. Carry hormones
D. Transport glucose -
Which component of blood is mainly responsible for clotting?
A. Plasma B. Red blood cells C. Platelets D. White blood cells
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Which blood vessel carries blood away from the heart?
A. Vein B. Artery C. Capillary D. Venule
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Which blood vessel usually contains valves to prevent backflow?
A. Artery B. Vein C. Capillary D. Aorta
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What is the largest artery in the human body?
A. Pulmonary artery B. Aorta C. Vena cava D. Coronary artery
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Where does gaseous exchange occur in the lungs?
A. Bronchi B. Trachea C. Alveoli D. Diaphragm
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Which gas diffuses from the alveoli into the blood?
A. Carbon dioxide B. Oxygen C. Nitrogen D. Hydrogen
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Which muscle contracts during inhalation to increase the volume of the chest cavity?
A. Biceps B. Diaphragm C. Triceps D. Abdominal muscle
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Which organ removes urea from the blood?
A. Liver B. Heart C. Kidney D. Pancreas
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What is the functional unit of the kidney?
A. Neuron B. Nephron C. Alveolus D. Villus
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Which nitrogenous waste product is mainly excreted in human urine?
A. Glucose B. Urea C. Starch D. Glycogen
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Which hormone helps regulate the amount of water reabsorbed by the kidneys?
A. Insulin B. ADH C. Adrenaline D. Thyroxine
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Which part of the brain controls balance and coordination?
A. Cerebrum B. Cerebellum C. Medulla D. Hypothalamus
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Which part of the nervous system carries impulses away from the central nervous system?
A. Sensory neuron B. Motor neuron C. Receptor D. Synapse
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A rapid automatic response to a stimulus is called
A. hormonal response B. reflex action C. growth D. tropism
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Which hormone lowers blood glucose concentration?
A. Glucagon B. Insulin C. Adrenaline D. Thyroxine
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Which hormone is produced by the thyroid gland?
A. Insulin B. Thyroxine C. Oestrogen D. Testosterone
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Which structure contains the genetic material of a cell?
A. Cell wall B. Nucleus C. Vacuole D. Ribosome
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What is the basic unit of heredity?
A. Chromosome B. Gene C. Cell D. Nucleus
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Which molecule carries genetic information?
A. ATP B. DNA C. Glucose D. Protein
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An organism with two identical alleles for a particular gene is described as
A. heterozygous B. homozygous C. dominant D. recessive
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If \(T\) represents tallness and \(t\) represents shortness, which genotype represents a heterozygous tall plant?
A. TT B. tt C. Tt D. TTT
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What is the expected phenotypic ratio from a cross between two heterozygous tall plants, \(Tt \times Tt\), assuming complete dominance?
A. 1 tall : 1 short
B. 2 tall : 1 short
C. 3 tall : 1 short
D. 1 tall : 3 short -
Which type of reproduction involves only one parent?
A. Sexual reproduction B. Asexual reproduction C. Cross-fertilisation D. Internal fertilisation
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Where does fertilisation normally occur in humans?
A. Uterus B. Ovary C. Oviduct D. Vagina
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Which hormone is mainly responsible for the development of female secondary sexual characteristics?
A. Testosterone B. Oestrogen C. Insulin D. ADH
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Which structure in a flower produces pollen grains?
A. Stigma B. Ovary C. Anther D. Sepal
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Which part of a flower receives pollen grains?
A. Anther B. Stigma C. Ovule D. Filament
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What is the transfer of pollen grains from anther to stigma called?
A. Fertilisation B. Germination C. Pollination D. Dispersal
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Which ecological term describes all the organisms living in a particular area?
A. Habitat B. Population C. Community D. Ecosystem
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Which organisms are mainly responsible for breaking down dead organic matter?
A. Producers B. Herbivores C. Decomposers D. Carnivores
Answer Key
| Que | Ans | Que | Ans | Que | Ans | Que | Ans | Que | Ans |
|---|---|---|---|---|---|---|---|---|---|
| 1 | B | 11 | C | 21 | B | 31 | B | 41 | B |
| 2 | C | 12 | B | 22 | C | 32 | B | 42 | C |
| 3 | C | 13 | C | 23 | B | 33 | B | 43 | C |
| 4 | D | 14 | C | 24 | B | 34 | B | 44 | B |
| 5 | B | 15 | B | 25 | B | 35 | B | 45 | B |
| 6 | B | 16 | B | 26 | C | 36 | B | 46 | B |
| 7 | B | 17 | B | 27 | B | 37 | B | 47 | C |
| 8 | C | 18 | C | 28 | B | 38 | B | 48 | B |
| 9 | B | 19 | B | 29 | C | 39 | B | 49 | B |
| 10 | C | 20 | B | 30 | B | 40 | B | 50 | C |
Challenge: Attempt all 50 questions without checking the answers. Give yourself one mark for each correct answer and calculate your total score out of 50.
10/06/2026
