Pariksha SaathiPedagogy
CTET Science MCQ with Answers, Paper 2
353 practice questions on Science and its Pedagogy (Paper II) for CTET Paper II (Mathematics and Science), with answers; most also have an explanation or a worked solution. Try each one before you open its answer.
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Q.201
Which of the following gives the correct order of steps in processing the fleece of sheep into wool?
- A Scouring, shearing, dyeing, sorting
- B Sorting, shearing, scouring, dyeing
- C Shearing, scouring, sorting, dyeing
- D Shearing, sorting, dyeing, scouring
Show answer
Correct answer: (C) Shearing, scouring, sorting, dyeing
The fleece is first removed from the sheep (shearing), then washed to remove grease, dust and dirt (scouring), then sorted by texture, and after the burrs are picked out the fibres are dyed. Finally they are straightened, combed and rolled into yarn.
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Q.202
While measuring the temperature of hot water with a laboratory thermometer, which practice is correct?
- A Keep the bulb immersed, not touching the container, and read it in the water
- B Take the thermometer out of the water first, then read it at eye level
- C Let the bulb rest on the bottom of the container to get a steady reading
- D Hold it by the bulb so that it stays firmly upright in the water
Show answer
Correct answer: (A) Keep the bulb immersed, not touching the container, and read it in the water
The bulb must be surrounded by the water and must not touch the bottom or sides of the container. A laboratory thermometer has no kink, so its reading begins to change as soon as it is taken out.
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Q.203
In Edgar Dale's Cone of Experience, which kind of experience lies at the base of the cone as the most concrete?
- A Verbal symbols
- B Direct, purposeful experiences
- C Visual symbols such as charts and maps
- D Recordings, radio and still pictures
Show answer
Correct answer: (B) Direct, purposeful experiences
Dale's cone arranges experiences from the most concrete at the base (direct, purposeful experiences) to the most abstract at the top (verbal symbols). It suggests grounding learning, especially that of young learners, in concrete experience.
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Q.204
Scientific knowledge includes facts, concepts, laws and theories. Which of the following is a CONCEPT rather than a fact?
- A The Moon revolves around the Earth
- B Density
- C Copper conducts electricity
- D Water boils at 100 °C at sea level
Show answer
Correct answer: (B) Density
A concept is an abstract idea that groups or relates many observations, such as density, force or energy. The other three are particular, verifiable facts.
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Q.205
In a region where water is scarce, which irrigation method delivers water drop by drop directly at the roots of plants with almost no wastage?
- A Drip system
- B Sprinkler system
- C Chain pump
- D Dhekli
Show answer
Correct answer: (A) Drip system
In the drip system, water falls drop by drop at the position of the roots, so it is best for fruit plants, gardens and trees and wastes almost no water. The sprinkler sprays water like rain and suits uneven and sandy land.
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Q.206
Consider the following statements about blood:
1. White blood cells fight germs that may enter the body.
2. Plasma is the fluid part of blood in which the blood cells are suspended.
3. Platelets contain haemoglobin and carry oxygen to all parts of the body.
Which of the statements given above is/are correct?
- A 1 only
- B 1 and 2 only
- C 2 and 3 only
- D 1, 2 and 3
Show answer
Correct answer: (B) 1 and 2 only
Statements 1 and 2 are correct. Statement 3 is wrong: haemoglobin is present in red blood cells, which carry oxygen; platelets help the blood to clot at a cut.
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Q.207
A Class 6 science test uses long, complex sentences and difficult words, so many children who understand the concepts score low because they cannot follow the questions. The main weakness of this test lies in its:
- A Objectivity of scoring
- B Ease of administration
- C Validity
- D Cost of printing
Show answer
Correct answer: (C) Validity
A test is valid when it measures what it is meant to measure. Here reading difficulty, not science understanding, decides the score, so the results cannot be taken as a measure of science learning.
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Q.208
Organisms whose cells have nuclear material that is NOT enclosed by a nuclear membrane are called prokaryotes. Which of the following are prokaryotes?
- A Amoeba, Paramecium and Euglena
- B Yeast and bread mould
- C Hydra and Spirogyra
- D Bacteria and blue-green algae
Show answer
Correct answer: (D) Bacteria and blue-green algae
In bacteria and blue-green algae the nuclear material lies in the cytoplasm without a nuclear membrane, so they are prokaryotes. Amoeba, Paramecium, Euglena, yeast, moulds, Hydra and Spirogyra have a well-organised nucleus with a nuclear membrane, so they are eukaryotes.
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Q.209
In general, the oxides of metals and the oxides of non-metals are respectively:
- A Basic and acidic
- B Acidic and basic
- C Neutral and basic
- D Acidic and neutral
Show answer
Correct answer: (A) Basic and acidic
Metal oxides such as magnesium oxide dissolve in water to give bases, which turn red litmus blue. Non-metal oxides such as sulphur dioxide dissolve in water to give acids, which turn blue litmus red.
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Q.210
To test a food sample for protein, a few drops of copper sulphate solution and caustic soda solution are added to it. Which observation shows that protein is present?
- A The mixture turns blue-black
- B A translucent oily patch forms
- C The mixture turns milky white
- D The mixture turns violet
Show answer
Correct answer: (D) The mixture turns violet
A violet colour with copper sulphate and caustic soda indicates protein. A blue-black colour with iodine indicates starch, and an oily patch on paper indicates fat.
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Q.211
Class 8 students ask 20 households in their neighbourhood which fuels they use for cooking, and show the answers in a table and a bar graph. Which method of learning are they using?
- A Survey method
- B Lecture method
- C Programmed instruction
- D Demonstration method
Show answer
Correct answer: (A) Survey method
In a survey, learners collect information directly from people or places around them and then organise and display the data. NCF 2005 counts surveys, organising data and displaying it among important parts of upper primary science pedagogy.
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Q.212
How does transpiration help a tall tree?
- A It creates a suction pull that lifts water high up, and cools the plant
- B It pushes the food made in the leaves down to the roots through the xylem
- C It lets the leaves take in water vapour from the air for photosynthesis
- D It increases the amount of water stored in the leaves of the tree
Show answer
Correct answer: (A) It creates a suction pull that lifts water high up, and cools the plant
Evaporation of water from the leaves through stomata creates a suction pull that can lift water through the xylem to great heights in tall trees. Transpiration also cools the plant; food moves through the phloem, not the xylem.
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Q.213
Cuscuta (amarbel) has no chlorophyll and takes ready-made food from the plant on which it climbs. Cuscuta and the plant it climbs on are respectively called:
- A Host and parasite
- B Parasite and host
- C Saprotroph and host
- D Parasite and insectivore
Show answer
Correct answer: (B) Parasite and host
Cuscuta deprives the plant it climbs on of valuable nutrients, so it is a parasite and that plant is its host. A saprotroph feeds on dead and decaying matter, not on a living plant.
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Q.214
After threshing, a farmer lets a mixture of grain and husk fall slowly from a height on a windy day. The light husk is blown away and the heavier grain falls in a heap. This method is called:
- A Sieving
- B Winnowing
- C Sedimentation
- D Handpicking
Show answer
Correct answer: (B) Winnowing
Winnowing separates the heavier and lighter components of a mixture by wind or by blowing air. Threshing, done before it, beats the stalks to free the grain.
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Q.215
A deficiency disease in which the glands in the neck appear swollen is caused by a lack of:
- A Iron
- B Calcium
- C Vitamin D
- D Iodine
Show answer
Correct answer: (D) Iodine
Lack of iodine causes goitre, in which the glands in the neck swell. Lack of iron causes anaemia, and lack of calcium or vitamin D affects bones and teeth.
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Q.216
A test item asks students to choose an answer and then to choose the reason for it from given options, where the wrong reasons reflect common misconceptions. Such a 'two-tier' item is mainly used to:
- A Rank students quickly on a merit list for admission to a course
- B Test how fast students can read
- C Diagnose the alternative conceptions behind students' answers
- D Reduce the length of the question paper
Show answer
Correct answer: (C) Diagnose the alternative conceptions behind students' answers
Two-tier diagnostic items reveal not only whether the answer is right but why the student chose it. The reason options are drawn from known alternative conceptions, so the teacher can see which ideas need to be addressed.
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Q.217
Students test an iron nail, a copper wire, aluminium foil, a rubber band, a plastic scale and a wooden stick in a circuit, and then conclude that metals generally conduct electricity. This is an example of the:
- A Demonstration method
- B Lecture method
- C Deductive approach
- D Inductive approach
Show answer
Correct answer: (D) Inductive approach
In the inductive approach learners move from particular examples and observations to a general rule. In the deductive approach the rule is given first and then applied to examples.
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Q.218
Assertion (A): Plants respire throughout the day and the night.
Reason (R): Plants produce oxygen by photosynthesis during the day, so they do not need to respire in the daytime.
- A Both A and R are true, and R is the correct explanation of A
- B Both A and R are true, but R is not the correct explanation of A
- C A is true, but R is false
- D A is false, but R is true
Show answer
Correct answer: (C) A is true, but R is false
Every living cell needs energy all the time, so plants respire day and night, like other organisms. R is false: photosynthesis does not replace respiration; in the daytime both processes go on together.
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Q.219
Assertion (A): Science and technology influence each other.
Reason (R): A technology is always developed only after the related scientific theory has been discovered.
Choose the correct option.
- A Both A and R are true, and R is the correct explanation of A
- B Both A and R are true, but R is not the correct explanation of A
- C A is true, but R is false
- D A is false, but R is true
Show answer
Correct answer: (C) A is true, but R is false
A is true: scientific ideas lead to new technologies, and new instruments make new science possible. R is false, as technology has often come first; steam engines, for example, were built and improved before the science of heat engines was worked out.
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Q.220
World Water Day, observed every year to draw attention to the importance of water and its conservation, falls on:
- A 5 June
- B 22 March
- C 22 April
- D 16 September
Show answer
Correct answer: (B) 22 March
World Water Day is observed on 22 March every year. 5 June is World Environment Day, 22 April is Earth Day and 16 September is the International Day for the Preservation of the Ozone Layer.
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Q.221
Which of the following statements about movement in animals is NOT correct?
- A Birds have hollow and light bones that suit flying
- B A snail moves with the help of a thick muscular foot
- C A snake has no backbone and moves with the help of bristles
- D A cockroach walks with three pairs of legs and has two pairs of wings
Show answer
Correct answer: (C) A snake has no backbone and moves with the help of bristles
A snake has a long backbone and many thin muscles that connect the backbone, ribs and skin, and it moves in loops. Bristles help an earthworm, not a snake, to grip the ground; the other three statements are correct.
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Q.222
Match each situation in List I with the main mode of heat transfer in List II:
List I: (A) The handle of a steel spoon kept in hot tea becomes warm (B) Water in a pan on a stove gets heated throughout (C) We feel the Sun's heat on our skin
List II: (1) Radiation (2) Conduction (3) Convection
- A A-3, B-2, C-1
- B A-2, B-1, C-3
- C A-2, B-3, C-1
- D A-1, B-3, C-2
Show answer
Correct answer: (C) A-2, B-3, C-1
Heat passes along the solid spoon by conduction; water is heated by convection as warmer water rises and cooler water sinks; and the Sun's heat reaches us by radiation, which needs no medium.
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Q.223
Assertion (A): At night, the breeze in coastal areas generally blows from the land towards the sea.
Reason (R): At night, water cools down faster than land.
- A Both A and R are true, and R is the correct explanation of A
- B Both A and R are true, but R is not the correct explanation of A
- C A is true, but R is false
- D A is false, but R is true
Show answer
Correct answer: (C) A is true, but R is false
A is true: this is the land breeze. R is false: at night the land cools faster than the water, so the air over the warmer sea rises and cooler air from the land flows towards it.
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Q.224
Which group contains only magnetic materials?
- A Iron, nickel and cobalt
- B Iron, copper and aluminium
- C Nickel, plastic and wood
- D Cobalt, glass and rubber
Show answer
Correct answer: (A) Iron, nickel and cobalt
Materials attracted by a magnet, such as iron, nickel and cobalt, are magnetic. Copper, aluminium, plastic, wood, glass and rubber are not attracted and are non-magnetic.
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Q.225
In pasteurisation, which helps milk keep longer without spoiling, the milk is:
- A Boiled at 100°C for half an hour and cooled slowly
- B Frozen below 0°C and kept frozen until it is used
- C Mixed with salt and sealed in an airtight can
- D Heated to about 70°C for 15 to 30 seconds and then suddenly chilled
Show answer
Correct answer: (D) Heated to about 70°C for 15 to 30 seconds and then suddenly chilled
In pasteurisation the milk is heated to about 70°C for 15 to 30 seconds (NCERT's figures; dairies commonly use about 72°C for 15 seconds), then suddenly chilled and stored, which prevents the growth of microbes. The process is named after Louis Pasteur, who developed such mild heating to stop spoilage.
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Q.226
The main limitation of the lecture-cum-demonstration method in teaching science is that:
- A It requires no apparatus at all
- B It cannot be used in a large class
- C Students remain passive observers and do not handle the apparatus themselves
- D It is the most expensive method
Show answer
Correct answer: (C) Students remain passive observers and do not handle the apparatus themselves
Lecture-cum-demonstration is economical and works well with large groups, but the teacher performs the experiment while students only watch, so they get little chance to develop manipulative and process skills.
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Q.227
After learning about evaporation, students are asked to explain why clothes dry faster on a windy day and why we feel cool after sweating. In the 5E model this activity belongs to the phase:
- A Engage
- B Explore
- C Explain
- D Elaborate
Show answer
Correct answer: (D) Elaborate
The Elaborate phase asks students to apply and extend a newly learnt concept to new situations, deepening understanding and transfer. Explore is the initial hands-on investigation, before the concept is formalised.
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Q.228
A cow resting in a shed keeps chewing even though it is not eating any fresh grass. This is because it:
- A Chews grass it has stored in pouches inside its cheeks
- B Brings partly digested food (cud) back from the rumen and chews it
- C Digests cellulose completely in its mouth with saliva
- D Swallows air between meals to help break down grass
Show answer
Correct answer: (B) Brings partly digested food (cud) back from the rumen and chews it
Ruminants quickly swallow grass and store it in the rumen, where it is partly digested and is called cud. The cud later returns to the mouth in small lumps and is chewed again; this is rumination.
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Q.229
Consider these statements about class-wise learning outcomes in science:
1. They are meant for labelling the children who do not achieve them as slow learners.
2. They help teachers check each child's progress and plan support where it is needed.
Which of the statements is/are correct?
- A Only 1
- B Only 2
- C Both 1 and 2
- D Neither 1 nor 2
Show answer
Correct answer: (B) Only 2
Learning outcomes state what children are expected to be able to do by the end of a class; they guide teachers and parents in tracking progress and planning help. Using them to label or rank children goes against their purpose, so statement 1 is wrong.
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Q.230
NCF 2005 wants upper primary children to work with their hands to design simple technological units and modules. Which classroom task best matches this?
- A Listing the states of India that have the largest number of wind farms
- B Copying a labelled diagram of a windmill neatly from the textbook into the notebook
- C Learning the definition of wind energy by heart for the unit test
- D Designing and making a working model of a windmill that lifts a small weight
Show answer
Correct answer: (D) Designing and making a working model of a windmill that lifts a small weight
NCF 2005 itself gives the example of designing and making a working model of a windmill to lift weights. Making and testing such a model joins science concepts with hands-on design; copying, memorising and listing do not.
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Q.231
What is the role of the hydrochloric acid secreted in the stomach?
- A It protects the inner lining of the stomach from damage
- B It breaks down fats into fatty acids and glycerol
- C It absorbs water and salts from the undigested food
- D It kills bacteria and makes the medium acidic for digestion
Show answer
Correct answer: (D) It kills bacteria and makes the medium acidic for digestion
Hydrochloric acid kills many bacteria that enter with food and makes the medium acidic, which helps the digestive juices act. The inner lining is protected by mucus, and fats are digested in the small intestine.
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Q.232
Why do arteries have thick, elastic walls?
- A They carry blood that is rich in carbon dioxide
- B Exchange of gases takes place through their walls
- C Blood flows through them rapidly and at high pressure
- D They have valves that let the blood flow in only one direction
Show answer
Correct answer: (C) Blood flows through them rapidly and at high pressure
Blood pumped by the heart flows in the arteries rapidly and at high pressure, so their walls are thick and elastic. Exchange of materials takes place through the thin walls of capillaries, and valves are found in veins.
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Q.233
Litmus, the most commonly used natural indicator, is extracted from:
- A Turmeric
- B China rose petals
- C Lichens
- D Red cabbage leaves
Show answer
Correct answer: (C) Lichens
Litmus is extracted from lichens and is available as a solution or as strips of red and blue litmus paper. Turmeric and China rose petals are other natural indicators.
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Q.234
Two potted plants of the same kind are kept, one in the dark for three days and the other in sunlight. When a leaf from each is tested with iodine solution, only the leaf from the plant in sunlight turns blue-black. This shows that:
- A Starch is made in the roots and sent to the leaves
- B Iodine reacts only with leaves kept in the dark
- C Sunlight is needed for the leaf to make starch
- D Chlorophyll is needed for the leaf to absorb iodine
Show answer
Correct answer: (C) Sunlight is needed for the leaf to make starch
A blue-black colour with iodine shows starch, which is formed from the carbohydrates made in photosynthesis. Only the plant that received sunlight made starch, showing that sunlight is necessary for photosynthesis.
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Q.235
When a person's kidneys stop working because of infection or injury, the blood is filtered at regular intervals through an artificial kidney. This process is called:
- A Dialysis
- B Blood transfusion
- C Transpiration
- D Fermentation
Show answer
Correct answer: (A) Dialysis
In dialysis the blood is passed through an artificial kidney, which removes waste products such as urea from it. A blood transfusion means giving blood from a donor, which does not remove waste.
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Q.236
When a narrow beam of sunlight passes through a glass prism, it splits into a band of seven colours. This splitting of white light is called:
- A Reflection
- B Dispersion
- C Lateral inversion
- D Persistence of vision
Show answer
Correct answer: (B) Dispersion
The splitting of white light into its seven colours is called dispersion; a rainbow is a natural example. It shows that sunlight is a mixture of colours.
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Q.237
The calorific value of a fuel is the amount of heat produced by the complete combustion of 1 kg of it. Which of the following fuels has the highest calorific value?
- A LPG
- B Hydrogen
- C Petrol
- D Coal
Show answer
Correct answer: (B) Hydrogen
Hydrogen has the highest calorific value among common fuels. NCERT's table gives 150000 kJ/kg for hydrogen against 55000 for LPG and 45000 for petrol, roughly three times as much. Calorific value is expressed in kilojoules per kilogram (kJ/kg).
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Q.238
The time period of a simple pendulum is the time taken by its bob to:
- A Move from one extreme position to the other
- B Complete one oscillation
- C Move from the mean position to one extreme
- D Come to rest after it is released
Show answer
Correct answer: (B) Complete one oscillation
One oscillation is a complete to-and-fro movement, for example from one extreme position to the other and back again. Going from one extreme to the other is only half an oscillation.
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Q.239
In a dry cell of the kind used in a torch, the positive terminal is the:
- A Metal disc at the bottom
- B Metal cap on the top
- C Paper cover around the cell
- D Black powder inside the cell
Show answer
Correct answer: (B) Metal cap on the top
A dry cell has two terminals: the metal cap on top is the positive (+) terminal and the metal disc at the base is the negative (-) terminal.
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Q.240
Water in a paper cup can be heated over a candle flame without the cup catching fire. This is because:
- A Paper is a non-combustible material, just like glass and stone
- B Heat goes into the water, keeping the paper below its ignition temperature
- C The water releases oxygen gas, which prevents the paper from burning
- D A candle flame is never hot enough to set any paper on fire
Show answer
Correct answer: (B) Heat goes into the water, keeping the paper below its ignition temperature
The heat supplied to the cup is transferred to the water, so the paper never reaches its ignition temperature, the lowest temperature at which it catches fire. An empty paper cup would burn quickly.
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Q.241
Before performing an activity, a student says, 'A wet cloth kept in the sun will dry faster than one kept in the shade.' Which process skill is the student demonstrating?
- A Inference
- B Classification
- C Prediction
- D Measurement
Show answer
Correct answer: (C) Prediction
A prediction is a forecast about a future outcome made before the event, based on prior knowledge or experience. Inference, by contrast, is an explanation of something already observed.
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Q.242
A Class 8 teacher asks students to find out how burning crop stubble in their district affects air quality and health, and what alternatives farmers have. This mainly reflects the:
- A Science-Technology-Society (STS) approach
- B Concentric approach
- C Lecture method
- D Deductive approach
Show answer
Correct answer: (A) Science-Technology-Society (STS) approach
The STS approach links science to real technological and social issues in the learners' world, such as pollution or farming practices, and asks them to weigh choices. It places science at the interface of science, technology and society rather than in isolated facts.
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Q.243
Consider the following statements about noise:
1. Being exposed to a loud sound continuously can cause temporary or even permanent impairment of hearing.
2. Living with loud noise for long can cause lack of sleep, hypertension and anxiety.
3. Planting trees along roads and around buildings helps reduce the noise reaching homes.
Which of the statements given above are correct?
- A 1 and 2 only
- B 1 and 3 only
- C 2 and 3 only
- D 1, 2 and 3
Show answer
Correct answer: (D) 1, 2 and 3
All three are true. Continuous exposure to a loud sound can impair hearing, temporarily or even permanently; long exposure to loud noise also harms health in many other ways, including sleeplessness, hypertension and anxiety; and trees along roads and around buildings cut down noise.
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Q.244
Which of the following is a well-formed, testable hypothesis?
- A Why do plants need water?
- B Plants are living things.
- C Water is good for plants.
- D Plants given more water will grow taller than plants given less water.
Show answer
Correct answer: (D) Plants given more water will grow taller than plants given less water.
A hypothesis is a tentative, testable statement that relates variables and can be checked by an experiment. A question, a general fact or a vague value statement cannot be tested directly.
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Q.245
Consider the following statements about silk:
1. Rearing silkworms for obtaining silk is called sericulture.
2. The caterpillars of the mulberry silk moth feed on mulberry leaves.
3. Silk fibres are obtained from the wings of the adult silk moth.
Which of the statements given above are correct?
- A 1 and 2 only
- B 2 and 3 only
- C 1 and 3 only
- D 1, 2 and 3
Show answer
Correct answer: (A) 1 and 2 only
Sericulture is the rearing of silkworms, and the caterpillars of the common silk moth feed on mulberry leaves. Silk fibres come from the cocoon that the caterpillar spins around itself, not from the adult moth, so statement 3 is wrong.
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Q.246
According to NEP 2020, assessment in schools will shift from summative tests that mainly check rote memorisation to assessment that is:
- A Focused mainly on how quickly and accurately students can recall textbook content
- B Held only once, at the end of each academic year
- C Regular, formative and competency-based, testing higher-order skills
- D Based on board examinations in every class from Class 3 onwards
Show answer
Correct answer: (C) Regular, formative and competency-based, testing higher-order skills
NEP 2020 says assessment will shift from summative, rote-memory testing to regular, formative, competency-based assessment that promotes learning and tests higher-order skills such as analysis, critical thinking and conceptual clarity.
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Q.247
Gram, peas and other legumes have Rhizobium bacteria living in their roots. The plant benefits from this association because Rhizobium:
- A Makes food by photosynthesis and passes it to the roots
- B Absorbs water from deep layers of soil for the plant
- C Converts atmospheric nitrogen into a form the plant can use
- D Breaks down dead leaves to release carbon dioxide
Show answer
Correct answer: (C) Converts atmospheric nitrogen into a form the plant can use
Rhizobium can take atmospheric nitrogen and convert it into a usable form, which it supplies to the legume. In return the plant gives the bacterium food and shelter, a symbiotic relationship.
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Q.248
A bar magnet is broken into two pieces. Which of the following is true of each piece?
- A Each piece has both a north pole and a south pole
- B One piece has only a north pole and the other only a south pole
- C Neither piece has any magnetic pole left
- D Only the larger piece still has magnetic poles
Show answer
Correct answer: (A) Each piece has both a north pole and a south pole
Magnetic poles always occur in pairs. Each broken piece becomes a complete magnet with its own north and south poles; a single isolated pole cannot be obtained.
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Q.249
Carbon dioxide from the air enters a leaf for photosynthesis through tiny pores on its surface. These pores are called:
- A Guard cells
- B Stomata
- C Veins
- D Root hairs
Show answer
Correct answer: (B) Stomata
Stomata are tiny pores on the surface of leaves through which gases are exchanged. Guard cells surround each pore and control its opening; they are not the pores themselves.
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Q.250
In 1665, Robert Hooke observed tiny box-like compartments with a magnifying device and called them 'cells'. What was he observing?
- A Thin slices of cork
- B A peel of onion
- C Cells from the inside of the cheek
- D A drop of pond water
Show answer
Correct answer: (A) Thin slices of cork
Robert Hooke observed thin slices of cork, a part of the bark of a tree, and saw honeycomb-like compartments that he named cells. Onion peel and cheek cells are common school activities, not what Hooke studied.
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How these questions were made
Authored by an AI assistant (Claude) from its own general knowledge of stable, well-established facts (no live lookup) - not reviewed by a subject-matter expert; verify against an official source before relying on any fact.