Questions about everyday things give parents a simple starting point for science at home. A child who asks why ice melts or how a leaf makes food is already asking a science question. One set of science questions for children covers biology, chemistry, astronomy, earth science and physics, grouped by difficulty from preschool to middle school. This article draws on several of those areas, and it answers each question in plain language before showing how three of them can become small home activities. Each answer is short enough to say aloud, so a family can use it the next time the question comes up.

The questions covered here are these:

  • How many bones does an adult have?
  • Which organ cleans the blood?
  • How do plants make food?
  • Why do we see lightning before we hear thunder?
  • Why do baking soda and vinegar bubble?
  • Why does bread rise?
  • How many legs do spiders and insects have?
  • How do birds fly?
  • Which planet is closest to the Sun?
  • How do seasons happen?
  • What is a volcano?

Questions about the body and food

How many bones does an adult have? An adult human has 206 bones. Babies start with about 270, and some of those bones fuse together as the child grows.

Which organ cleans the blood? The kidneys filter waste out of the blood. Waste means material the body has no use for, so a child can answer in two parts: the organ, and its job.

Families curious about a classroom option for primary science can read what the https://www.exploreracademy.sg/programmes-primary-science/ page offers: a Primary 3-6 Science programme aligned with the MOE curriculum, small classes with hands-on lab experiments built into lessons, onsite or online lesson formats, and termly progress reports for parents.

Questions about plants and the sky

How do plants make food? Plants make food through photosynthesis, a process that uses sunlight, water and carbon dioxide. Carbon dioxide is one of those three inputs, so a child can practise naming all three aloud. A clear answer has three parts: what goes in, what the plant makes, and why the process matters to the plant.

Why do we see lightning before we hear thunder? The flash and the rumble start at the same moment, but light reaches people first because it travels much faster than sound. What a child can notice during a storm is the gap between the two. The answer is the speed difference, so one clear sentence is enough.

Questions in the kitchen

Why do baking soda and vinegar bubble? Mixing them gives off carbon dioxide, the same gas that plants use, and the gas shows up as bubbles a student can watch form right away. Keeping the amounts the same each time is a simple habit for comparing results. The bubbles are the visible sign of the gas, so the child’s job is to watch closely and describe what appears. One Singapore home-experiment guide lists a Baking Soda Volcano among its experiments, so the reaction is one a family can repeat at home.

Why does bread rise? Yeast produces gas bubbles, and those bubbles make the bread rise. The same pattern appears in the baking soda reaction, where a gas forms and bubbles show it. Setting the two results side by side shows the child the pattern.

An adult should supervise any experiment that uses a stove, hot water or sharp items.

Questions about animals

How many legs do spiders and insects have? Spiders have 8 legs, and insects have 6. Counting legs is a quick way to sort a creature into one group or the other, and it works on a real creature, a picture in a book or a toy. Both spiders and insects are animals, so comparing them is a useful way to see how two groups differ.

How do birds fly? Birds fly partly because of hollow bones and the shape of their wings. The word “partly” matters, because bones and wings explain only part of how a bird stays in the air. A child can use that word as a reminder to ask what else is involved.

Questions about space and Earth

Which planet is closest to the Sun? Mercury is the closest, and it completes one orbit in 88 Earth days, the same days shown on a calendar.

How do seasons happen? Seasons happen because of Earth’s tilt and its orbit around the Sun. Tilt is the lean of the planet’s axis, and orbit is the path the planet follows around the Sun. The answer needs both ideas, so a child who explains only one has part of it.

What is a volcano? A volcano is an opening in Earth’s crust, the outer layer of the planet, where molten rock escapes as lava. Molten rock is rock that has melted into liquid. A child who sees a picture of lava flowing can connect the picture to this definition and then ask where the rock came from.

Home activities that turn a question into a test

Turning a question into a test means the child makes a guess, tries something, and checks the result. Each activity below follows four steps: predict, test, observe and explain. The Singapore guide behind the Baking Soda Volcano describes its experiments as having an “under S$15 total investment” and uses household items. Rainbow Walking Water, Magnet Exploration, Balloon Rocket and Shadow Exploration also appear in that guide, although this article covers only the three that match the concepts below.

Sink or float asks what makes an object sink or float. Density describes how tightly the material in an object is packed, and buoyancy is the upward push that water gives an object. The predict step asks the child to guess which objects will sink. Each object then goes into water, one at a time. The observe step records which objects sank and which stayed up. Density and buoyancy then explain the result. Writing the predictions down before the test makes the comparison clearer.

In the ice melting race, the child compares how quickly two pieces of ice melt, then explains the difference. The race shows heat transfer, which is the movement of heat from warmer things to cooler things. It also shows states of matter, the forms a substance can take, such as solid, liquid or gas. Ice turns into liquid water as it melts, so the race connects a visible change to the idea of states. The child can then describe the race in one sentence, such as which piece melted first and what that result shows.

Rain in a jar models the water cycle, the way water moves from the ground into the air and back down as rain. The child predicts what will happen to the water in the jar, then checks it again after a while. Changes are described in plain words during the observe step. Those changes connect to the water cycle.

A simple routine for answering a child’s question

Start by asking the child what they think will happen. Next, try a test or look for a clue, such as the bubbles from baking soda and vinegar, or the order of flash and sound in a storm. Finish by explaining the result together in one sentence. One Singapore home-experiment guide, aimed at children aged 4 to 6, says preschoolers learn through doing, not listening. That idea fits this routine, since the child does the guessing and the checking. Parents can keep the routine light by letting the child hold the pen, point at the jar or name the gas. The routine works with any question in this article, so a family does not need a new plan for each one.

Where to go next

A good next step is small. Choose one question from this article, ask the child for a guess, and run one activity together. A new question at the next meal means the same routine has already started. Keeping a short notebook of questions and tests puts the record in one place.