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.301
Boiled rice is placed in two test tubes. Saliva is added to tube A and only water to tube B. After 30-40 minutes, iodine solution is added to both. Tube B turns blue-black but tube A does not. The best explanation is that saliva:
- A Breaks down the protein in rice into amino acids
- B Breaks down the fat in rice into fatty acids
- C Reacts with iodine and removes its colour
- D Breaks down the starch in rice into sugar
Show answer
Correct answer: (D) Breaks down the starch in rice into sugar
Saliva breaks down starch into sugars, so no starch is left to give a blue-black colour with iodine in tube A. In tube B, with only water, the starch remains unchanged.
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Q.302
A 'light year' is a unit of:
- A Distance
- B Time
- C Speed
- D Brightness
Show answer
Correct answer: (A) Distance
A light year is the distance that light, travelling at about 300,000 km per second, covers in one year. In spite of the word 'year' in its name, it is used to express the huge distances between stars.
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Q.303
Match the natural source in List I with the acid it contains (List II).
List I: A. Vinegar B. Ant's sting C. Curd D. Tamarind
List II: 1. Lactic acid 2. Tartaric acid 3. Acetic acid 4. Formic acid
- A A-4, B-3, C-2, D-1
- B A-3, B-1, C-4, D-2
- C A-3, B-4, C-1, D-2
- D A-2, B-4, C-1, D-3
Show answer
Correct answer: (C) A-3, B-4, C-1, D-2
Vinegar contains acetic acid, an ant's sting contains formic acid, curd contains lactic acid and tamarind contains tartaric acid. Citric acid is found in citrus fruits such as lemon and orange.
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Q.304
Which statement correctly distinguishes breathing from cellular respiration?
- A Breathing is exchange of gases with the air; cellular respiration releases energy from food in cells
- B Breathing releases energy from food in cells; cellular respiration is exchange of gases with the air
- C Breathing takes place only in animals, while cellular respiration takes place only in plants
- D Both terms mean the same process of taking in oxygen and giving out carbon dioxide
Show answer
Correct answer: (A) Breathing is exchange of gases with the air; cellular respiration releases energy from food in cells
Breathing means taking in oxygen-rich air and giving out air rich in carbon dioxide. Cellular respiration is the breakdown of food in the cells to release energy, and it goes on in every living cell of plants and animals.
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Q.305
Soil erosion by wind and water is much greater in areas with little or no vegetation, such as deserts and bare hill slopes. Why?
- A There are no plant roots to bind the soil firmly
- B The soil there has too much humus, which makes it loose
- C Such areas always get more rain than forested areas
- D Strong sunlight on bare ground dissolves the soil particles
Show answer
Correct answer: (A) There are no plant roots to bind the soil firmly
Plant roots bind the soil firmly, and plant cover shields it from the direct force of wind and rain. Where there is little or no vegetation, the topsoil is easily carried away, which is soil erosion.
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Q.306
In R.H. Dave's classification of the psychomotor domain, which is the lowest level, at which a learner watches an action and copies it?
- A Imitation
- B Manipulation
- C Precision
- D Naturalisation
Show answer
Correct answer: (A) Imitation
Dave's levels are imitation, manipulation, precision, articulation and naturalisation. A learner first copies the teacher's way of handling apparatus (imitation) and finally performs the skill smoothly and automatically (naturalisation).
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Q.307
In the development of a human baby, the stage of the embryo in which all the body parts can be identified is called the:
- A Zygote
- B Gamete
- C Foetus
- D Larva
Show answer
Correct answer: (C) Foetus
The zygote divides repeatedly to form an embryo, which gets embedded in the wall of the uterus; when all its body parts can be identified it is called a foetus. A zygote is the single cell formed by fertilisation.
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Q.308
Galvanisation protects iron articles such as water pipes from rusting by depositing on them a layer of:
- A Tin
- B Copper
- C Zinc
- D Chromium
Show answer
Correct answer: (C) Zinc
Depositing a layer of zinc on iron is called galvanisation; the iron pipes that carry water in homes are galvanised. Depositing chromium, painting and greasing are other ways of preventing rust.
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Q.309
An ant bite injects an acidic liquid into the skin. Which of the following gives relief by neutralising it?
- A Applying vinegar on the bite
- B Squeezing lemon juice on the bite
- C Rubbing common salt on the bite
- D Rubbing moist baking soda on the bite
Show answer
Correct answer: (D) Rubbing moist baking soda on the bite
The acid (formic acid) is neutralised by rubbing moist baking soda (sodium hydrogencarbonate) or calamine solution, which contains zinc carbonate. Vinegar and lemon juice are acids, and common salt is neutral.
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Q.310
Aeroplanes, boats, fish and birds all have a streamlined body shape. The advantage of this shape is that it:
- A Increases the grip of the body on the surrounding air or water
- B Makes the body heavier so that it moves along more steadily
- C Stops the surrounding fluid from exerting any pressure on the body
- D Reduces fluid friction (drag) as the body moves through air or water
Show answer
Correct answer: (D) Reduces fluid friction (drag) as the body moves through air or water
Air and water exert fluid friction, or drag, on objects moving through them. A streamlined shape reduces this drag, so less energy is needed to move.
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Q.311
Many students believe that a ball rolling on the ground stops because 'its force gets used up'. Which explanation should the teacher help them reach?
- A Moving objects naturally come to rest because rest is their natural state
- B Friction from the ground opposes the motion and slows the ball down
- C Gravity pulls the ball backwards along the ground until it stops
- D Every moving object stops by itself once its stored force is finished
Show answer
Correct answer: (B) Friction from the ground opposes the motion and slows the ball down
A moving object does not carry a store of 'force' that runs out. Friction opposes the motion and slows the ball; on a smoother surface, with less friction, the ball rolls farther, which students can test for themselves.
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Q.312
Many children think that only four-legged, furry creatures are 'animals', and do not count a butterfly, a fish or a human being as an animal. The most likely source of this alternative conception is:
- A A lack of intelligence among these children
- B The everyday meaning of the word 'animal'
- C Errors printed in all the science textbooks used by them
- D Children's dislike of the subject of biology
Show answer
Correct answer: (B) The everyday meaning of the word 'animal'
Many alternative conceptions come from everyday language and experience, in which words such as 'animal', 'heat' or 'weight' are used differently from science. Teachers need to bring out these meanings and contrast them with the scientific use.
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Q.313
Sea water is allowed to stand in shallow pits under the sun for a few days. The water turns into vapour, leaving behind solid salts from which common salt is obtained. The process used is:
- A Condensation
- B Filtration
- C Evaporation
- D Decantation
Show answer
Correct answer: (C) Evaporation
Heated by sunlight, the water slowly changes into water vapour by evaporation and the salts are left behind. Common salt is then obtained from this mixture of salts by further purification.
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Q.314
A teacher wants to assess how well each student uses a spring balance during a practical. The most suitable method is to:
- A Hold an oral quiz on the definition of weight and its unit
- B Observe each student taking a reading, using a checklist of the required steps
- C Ask students to copy the procedure for using it from the textbook
- D Give a written multiple-choice test on the parts and working of a spring balance
Show answer
Correct answer: (B) Observe each student taking a reading, using a checklist of the required steps
Practical (psychomotor) skills are best assessed by observing the actual performance against set criteria, for example with a checklist or rating scale. Written or oral questions about the apparatus test knowledge, not the skill itself.
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Q.315
A student believes that a bulb will glow if just one wire connects it to one terminal of a cell. What should the teacher help the student understand?
- A The bulb needs a wire only to hold it firmly in its place
- B One wire is enough, because electricity flows out of the cell like water from a tap
- C A bulb glows only in a closed circuit, joined to both terminals of the cell
- D The bulb glows with one wire only if that wire is very long
Show answer
Correct answer: (C) A bulb glows only in a closed circuit, joined to both terminals of the cell
Children often hold a 'source-sink' idea, in which electricity flows out of the cell into the bulb and is used up there. A bulb glows only in a closed circuit; letting students try one wire and then two wires shows this directly.
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Q.316
Consider the following statements:
1. Bile juice is secreted by the gall bladder.
2. Bile juice plays an important role in the digestion of fats.
Which of the statements given above 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
Bile is secreted by the liver, the largest gland in the body, and is only stored in the gall bladder, so statement 1 is wrong. Bile plays an important role in the digestion of fats.
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Q.317
Children often say that a cloud and a candle flame are living because they move, while a tree is non-living because it does not move from its place. To address these ideas, the teacher should:
- A Ask them to memorise a list of living and non-living things
- B Avoid such examples, since they only confuse children
- C Help them compare several features together, such as growth, respiration and reproduction
- D Tell them that the ability to move from place to place is the single test of whether something is living
Show answer
Correct answer: (C) Help them compare several features together, such as growth, respiration and reproduction
Children often judge life by a single feature such as movement. Comparing a set of characteristics together helps them see why a tree is living and a cloud or flame is not, and build the scientific idea of a living thing.
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Q.318
Concept mapping, in which concepts are shown in boxes connected by lines labelled with linking words, was developed by:
- A Jean Piaget
- B Jerome Bruner
- C Lev Vygotsky
- D Joseph Novak
Show answer
Correct answer: (D) Joseph Novak
Joseph Novak developed concept mapping at Cornell University, building on Ausubel's theory of meaningful learning. Concept maps show hierarchical relationships among concepts through labelled links.
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Q.319
The zero mark at one end of Ravi's scale is broken. How can he still measure the length of a pencil correctly with it?
- A Start from the broken edge and take the reading at the other end as the length
- B Guess where the zero mark used to be and add 1 cm to the final reading
- C Start from another full mark, such as 1.0 cm, and subtract it from the final reading
- D Measure twice from the broken edge and take the average of the two readings
Show answer
Correct answer: (C) Start from another full mark, such as 1.0 cm, and subtract it from the final reading
If the zero mark is not clear, any other full mark can be used as the starting point; the length is the difference between the two readings. Reading from the broken edge treats it as zero, which gives a wrong value.
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Q.320
According to NCF 2005, good science education should be:
- A True to the child, true to life and true to science
- B Aimed mainly at preparing future scientists and engineers
- C Uniform for all children and centred on the final examination
- D True to the textbook, the syllabus and the examination
Show answer
Correct answer: (A) True to the child, true to life and true to science
NCF 2005 says that good science education is true to the child, true to life and true to science, and derives its validity criteria from this. The other options describe the examination-driven approach that NCF 2005 wants to move away from.
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Q.321
A blacksmith heats an iron rim, slightly smaller than a wooden cart wheel, before fitting it on the wheel, and then pours cold water over it. Why?
- A Heating makes the iron permanently longer so that it stays loose
- B Heating removes rust, so the rim slides on easily
- C The rim expands on heating to fit, then contracts on cooling to grip tightly
- D The hot rim joins chemically with the wood to form a new substance
Show answer
Correct answer: (C) The rim expands on heating to fit, then contracts on cooling to grip tightly
Metals expand on heating and contract on cooling. The heated rim expands enough to slip onto the wheel, and when cooled with water it contracts and fits tightly; this is a reversible change.
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Q.322
It is said that 'there is no waste in a forest'. Which process best explains this?
- A Decomposers turn dead matter into humus, returning nutrients to the soil
- B The animals of the forest eat up all the dead leaves that fall on the ground
- C Rainwater washes all the dead matter out of the forest into rivers
- D Natural fires burn away all the dead matter every few years
Show answer
Correct answer: (A) Decomposers turn dead matter into humus, returning nutrients to the soil
Microorganisms and other decomposers break down dead plants and animals into a dark substance called humus, and the nutrients go back into the soil to be used again by plants. So nothing goes waste in a forest.
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Q.323
A teacher writes in a notebook: '14 August: during the group activity, Ravi noticed the spilt water and cleaned it up without being asked.' Such brief, dated, factual notes on significant behaviour are called:
- A Rating scales
- B Anecdotal records
- C Question banks
- D Standardised achievement tests
Show answer
Correct answer: (B) Anecdotal records
Anecdotal records are short, objective, dated descriptions of significant incidents in a learner's behaviour. Over time they help assess affective qualities such as responsibility and cooperation, which written tests cannot capture.
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Q.324
At puberty, the production of sex hormones by the testes and the ovaries is controlled by a hormone secreted by the:
- A Thyroid gland
- B Pituitary gland
- C Adrenal gland
- D Pancreas
Show answer
Correct answer: (B) Pituitary gland
Hormones of the pituitary gland control the production of testosterone in the testes and oestrogen in the ovaries; the pituitary also secretes growth hormone. The thyroid makes thyroxine, the adrenals make adrenalin and the pancreas makes insulin.
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Q.325
Some plants have red, violet or brown leaves, yet they make their own food by photosynthesis. This is possible because:
- A They take ready-made food from the soil through roots
- B Red pigments carry out photosynthesis without chlorophyll
- C They make all their food at night, when no light is needed
- D Their leaves contain chlorophyll hidden by other pigments
Show answer
Correct answer: (D) Their leaves contain chlorophyll hidden by other pigments
Leaves of other colours also contain chlorophyll; large amounts of red, brown and other pigments mask its green colour. Chlorophyll is needed to trap the energy of sunlight, so photosynthesis cannot happen without it.
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Q.326
Assertion (A): Food cans are coated with tin and not with zinc.
Reason (R): Zinc is more reactive than tin.
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: (A) Both A and R are true, and R is the correct explanation of A
Being more reactive, zinc could react with substances in the food, while the less reactive tin is safer. Both statements are true and R correctly explains A.
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Q.327
Assertion (A): The Moon is a luminous object.
Reason (R): The Moon shines because it reflects the sunlight that falls on it.
- 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: (D) A is false, but R is true
A is false: a luminous object gives out light of its own, like the Sun or a candle flame, and the Moon does not. R is true: we see the Moon because it reflects sunlight, which makes it a non-luminous object.
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Q.328
Arteries usually carry oxygen-rich blood away from the heart. Which blood vessel is an exception, carrying blood rich in carbon dioxide from the heart to the lungs?
- A Pulmonary vein
- B Pulmonary artery
- C Aorta
- D Capillaries of the lungs
Show answer
Correct answer: (B) Pulmonary artery
The pulmonary artery carries blood rich in carbon dioxide from the heart to the lungs, where the blood takes up oxygen. The pulmonary vein is the opposite exception: it brings oxygen-rich blood from the lungs back to the heart. The aorta carries oxygen-rich blood from the heart to the body, so it is not an exception.
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Q.329
Most earthquakes are caused by:
- A Heavy rainfall soaking deep down into the soil and rocks
- B Strong winds blowing over high mountain ranges
- C Changes in the phases of the Moon during a month
- D Movement of the plates of the Earth's outermost layer
Show answer
Correct answer: (D) Movement of the plates of the Earth's outermost layer
The Earth's outermost layer is broken into pieces called plates, which keep moving slowly. When they brush past or collide with one another, the crust is disturbed and an earthquake occurs, so plate boundaries are weak zones called seismic or fault zones.
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Q.330
In the problem-solving method based on John Dewey's steps of reflective thinking, the FIRST step is:
- A Collecting relevant data
- B Testing the hypothesis
- C Sensing and defining the problem
- D Drawing a conclusion
Show answer
Correct answer: (C) Sensing and defining the problem
Problem solving begins when learners feel and clearly define a problem; only then do they frame hypotheses, collect data, test the hypotheses and draw conclusions.
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Q.331
Match List I with List II:
List I: (A) Loudness (B) Pitch (C) Unit of frequency (D) Unit of loudness
List II: (1) Hertz (2) Decibel (3) Amplitude of vibration (4) Frequency of vibration
- A A-3, B-4, C-1, D-2
- B A-4, B-3, C-1, D-2
- C A-3, B-4, C-2, D-1
- D A-4, B-3, C-2, D-1
Show answer
Correct answer: (A) A-3, B-4, C-1, D-2
Loudness depends on the amplitude of vibration and is expressed in decibels (dB); pitch depends on the frequency, which is measured in hertz (Hz). A larger amplitude gives a louder sound and a higher frequency a higher pitch.
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Q.332
A flower that has either stamens or a pistil, but not both, is called unisexual. Which of the following plants bears unisexual flowers?
- A Mustard
- B Rose
- C Petunia
- D Maize
Show answer
Correct answer: (D) Maize
Maize and cucumber bear unisexual flowers. Mustard, rose and petunia bear bisexual flowers, which have both stamens and a pistil.
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Q.333
Which vitamin can our body make for itself in the presence of sunlight?
- A Vitamin D
- B Vitamin C
- C Vitamin A
- D Vitamin B1
Show answer
Correct answer: (A) Vitamin D
The body prepares vitamin D in the presence of sunlight; vitamin D helps keep bones and teeth healthy. The other vitamins listed must come from our food.
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Q.334
A soil sample has very fine particles packed tightly together with little space for air, and it holds water for a long time. This soil is:
- A Sandy soil
- B Loamy soil
- C Gravelly soil
- D Clayey soil
Show answer
Correct answer: (D) Clayey soil
Clayey soil has fine particles that are tightly packed, leaving little space for air, so it holds water well and is heavy. Sandy soil has large particles with large air spaces and drains quickly, and loamy soil is a mixture of sand, clay and silt.
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Q.335
Groundwater that is stored between layers of hard rock below the water table, and can be pumped out with tube wells or hand pumps, is called:
- A The water table
- B Infiltration
- C An aquifer
- D A check dam
Show answer
Correct answer: (C) An aquifer
Water stored between layers of hard rock below the water table is an aquifer. The water table is the upper level of the zone in which all the spaces in the soil are filled with water, and infiltration is the seeping of rainwater into the ground.
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Q.336
Which planet is often called the 'morning star' or the 'evening star', although it is not a star?
- A Mars
- B Venus
- C Jupiter
- D Mercury
Show answer
Correct answer: (B) Venus
Venus is the brightest planet in the night sky and is seen in the eastern sky before sunrise or in the western sky after sunset. It shines by reflected sunlight, so it is not a star.
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Q.337
Before sowing, a farmer puts wheat seeds in a bucket of water and stirs them. A few seeds float on the surface. These floating seeds are:
- A Damaged and hollow, so they should be removed
- B Healthy and heavy, so they should be sown first
- C Coated with fertiliser, so they should be kept
- D Already germinated, so they need no further care
Show answer
Correct answer: (A) Damaged and hollow, so they should be removed
Damaged seeds become hollow and lighter, so they float on water, while good, healthy seeds sink. Selecting the seeds that sink gives a better crop.
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Q.338
During a lesson on soil, a child from a farming family explains how her grandfather judges whether the soil is moist enough for sowing by pressing a lump of it in his hand. The teacher should:
- A Tell her politely that only the knowledge given in the textbook counts in a science class
- B Say that farmers' methods are always unscientific
- C Value this local knowledge and link it to a class activity on soil moisture
- D Ignore it, as it would waste lesson time
Show answer
Correct answer: (C) Value this local knowledge and link it to a class activity on soil moisture
NCF 2005 asks schools to connect knowledge to life outside school and to treat the knowledge children bring from home and community as a resource. Discussing and testing such local practices links science to the child's experience.
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Q.339
A teacher plans a unit on 'Water' in which students study the states of water, water-borne diseases, rainfall data on a map and the uses of water in their village. This is an example of the:
- A Integrated approach
- B Deductive approach
- C Disciplinary approach, which treats each subject separately
- D Lecture method
Show answer
Correct answer: (A) Integrated approach
The integrated approach organises learning around a theme and connects ideas from different subjects, such as physics, biology, health and geography, and from life. It avoids presenting knowledge in separate, unconnected compartments.
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Q.340
Honey, a food obtained from animals, is made by bees from:
- A Nectar they collect from flowers
- B Pollen grains stored in the hive
- C Sap that oozes from tree bark
- D Wax secreted by the worker bees
Show answer
Correct answer: (A) Nectar they collect from flowers
Bees collect nectar, the sweet juice of flowers, convert it into honey and store it in their hive. Wax is what the honeycomb is built of, not the source of honey.
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Q.341
A student says, 'It is summer when the Earth is closest to the Sun and winter when it is farthest.' This statement is:
- A Scientifically correct
- B Correct only for the Northern Hemisphere
- C A misconception; seasons are caused by the tilt of the Earth's axis relative to its orbit
- D Correct only for places on the Equator
Show answer
Correct answer: (C) A misconception; seasons are caused by the tilt of the Earth's axis relative to its orbit
Seasons result from the 23.5 degree tilt of the Earth's axis, which changes the directness of sunlight over the year. The Earth is in fact closest to the Sun in early January, during the Northern Hemisphere winter.
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Q.342
Which of the following is an open-ended question in science?
- A What is the boiling point of water at sea level?
- B In how many different ways can you separate a mixture of sand, salt and iron filings? Explain each.
- C Name the gas released during photosynthesis.
- D Which organ pumps blood in the human body?
Show answer
Correct answer: (B) In how many different ways can you separate a mixture of sand, salt and iron filings? Explain each.
An open-ended question admits several valid responses and requires reasoning and explanation, encouraging divergent thinking. The other three have a single fixed answer and test recall only.
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Q.343
A Class 7 student finishes every science activity quickly and keeps asking questions that go beyond the textbook. The most suitable way to support her is to:
- A Tell her to stop asking questions from outside the textbook
- B Ask her to sit quietly and wait until all the others in the class have finished
- C Provide enrichment such as open-ended investigations and challenging projects
- D Give her more of the same exercises so that she stays busy
Show answer
Correct answer: (C) Provide enrichment such as open-ended investigations and challenging projects
Gifted learners benefit from enrichment that deepens and broadens their thinking through open-ended problems, projects and wider resources. Repeating similar work, making them wait or discouraging questions leads to boredom and loss of interest.
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Q.344
Match the organism (List I) with its method of asexual reproduction (List II):
A. Yeast
B. Spirogyra
C. Bread mould
D. Potato
1. Fragmentation
2. Budding
3. Vegetative propagation
4. Spore formation
- A A-1, B-2, C-4, D-3
- B A-2, B-4, C-1, D-3
- C A-2, B-1, C-4, D-3
- D A-2, B-1, C-3, D-4
Show answer
Correct answer: (C) A-2, B-1, C-4, D-3
Yeast forms buds that grow into new cells (budding); Spirogyra breaks into pieces that each grow into a new alga (fragmentation); bread mould reproduces by spores; and a potato grows new plants from the buds (eyes) on its tuber, which is vegetative propagation.
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Q.345
In the revised Bloom's taxonomy of the cognitive domain (Anderson and Krathwohl), the HIGHEST level is:
- A Create
- B Evaluate
- C Analyse
- D Apply
Show answer
Correct answer: (A) Create
The revised taxonomy runs Remember, Understand, Apply, Analyse, Evaluate and Create. In the original taxonomy Evaluation was the top level, but the revision placed Create above Evaluate.
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Q.346
Amoeba, a single-celled organism, captures its food by:
- A Swallowing it through a permanent mouth and food pipe
- B Pushing out pseudopodia around it and trapping it in a food vacuole
- C Absorbing nutrients from dead matter like a mushroom
- D Making it in its green body with the help of sunlight
Show answer
Correct answer: (B) Pushing out pseudopodia around it and trapping it in a food vacuole
Amoeba pushes out finger-like pseudopodia (false feet) around a food particle and engulfs it. The food is trapped in a food vacuole, where digestive juices break it down.
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Q.347
Coal was formed from dead vegetation buried deep under the earth, which under high pressure and high temperature slowly changed into coal. This slow process is called:
- A Combustion
- B Refining
- C Crystallisation
- D Carbonisation
Show answer
Correct answer: (D) Carbonisation
As coal contains mainly carbon, the slow conversion of dead vegetation into coal is called carbonisation. Because it formed from the remains of living organisms, coal is a fossil fuel.
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Q.348
'Design an experiment to find out which of three fabrics absorbs the most water.' This task mainly belongs to which level of the revised Bloom's taxonomy?
- A Remember
- B Create
- C Understand
- D Apply
Show answer
Correct answer: (B) Create
Designing a new procedure requires students to plan, generate and produce an original investigation, which is the Create level. Apply would be using a given procedure in a familiar situation.
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Q.349
When a candle burns, the wax melts and the wax also burns to give heat, light and gases. The burning of a candle therefore involves:
- A Only a physical change, since the wax just melts
- B Only a chemical change, since nothing melts
- C Neither kind of change, since no wax is used up
- D Both a physical change and a chemical change
Show answer
Correct answer: (D) Both a physical change and a chemical change
Melting of wax is a physical change, while burning of the wax vapour, which forms new substances such as carbon dioxide and water vapour, is a chemical change. So both kinds of change occur together.
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Q.350
In a forest, the branches of tall trees spread out and form a roof-like cover over the other plants. This cover is called the:
- A Crown
- B Understorey
- C Humus
- D Canopy
Show answer
Correct answer: (D) Canopy
The branchy part of a tree above its stem is its crown; the crowns of tall trees together form a roof over the forest, called the canopy. Below it, shrubs and herbs form the lower layers (understoreys), and humus is decayed matter in the soil.
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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.