Science worksheets for Class 7 — with answers

Answer the questions.

1. Where does digestion of food begin in humans?
2. Which organ produces bile?
3. Lichens are a partnership of ______ and ______.
4. Which animals chew the cud?
5. Where is most food absorbed in our body?
6. Name an insectivorous plant.
7. Name the longest part of the alimentary canal.
8. Name the raw materials for photosynthesis.
9. Fungi that feed on dead matter are called ______.
10. How does an amoeba take in food?

Answer the questions.

1. A wind blowing from the sea to the land is called a ______.
2. Name two good conductors of heat.
3. Why do woollen clothes keep us warm?
4. Why do we wear light-coloured clothes in summer?
5. The normal temperature of the human body is ______.
6. The degree of hotness of a body is called its ______.
7. Heat moves through liquids and gases by ______.
8. How does heat from the Sun reach us?
9. Name the three ways heat travels.
10. Heat moves through solids by ______.

Answer the questions.

1. Why do we rub baking soda on an ant bite?
2. Name an acid found in curd.
3. What colour does red litmus turn in a base?
4. Acids taste ______; bases taste ______.
5. Vinegar contains ______ acid.
6. The reaction of an acid with a base is called ______.
7. Solutions that are neither acidic nor basic are ______.
8. Name a natural indicator.
9. What is formed when an acid reacts with a base?
10. What colour does blue litmus turn in an acid?

Answer the questions.

1. A change in which a new substance is formed is a ______ change.
2. Getting large crystals of a substance from its solution is called ______.
3. Name one way to prevent rusting.
4. Coating iron with zinc is called ______.
5. Is rusting of iron a physical or a chemical change?
6. Is tearing paper a physical or a chemical change?
7. What two things are needed for iron to rust?
8. Is dissolving sugar in water a physical or a chemical change?
9. Is burning of paper a physical or a chemical change?
10. Is melting of ice a physical or a chemical change?

Answer the questions.

1. How many chambers does the human heart have?
2. Respiration without oxygen is called ______ respiration.
3. Loss of water from leaves as vapour is called ______.
4. Which tissue carries food in plants?
5. Why do we get muscle cramps after heavy exercise?
6. Which tissue carries water in plants?
7. Blood vessels that carry blood away from the heart are ______.
8. Insects breathe through tiny holes called ______.
9. Breaking down food to release energy is called ______.
10. How do earthworms breathe?

Answer the questions.

1. What is the SI unit of speed?
2. A train moves at 80 km/h for 3 hours. How far does it go?
3. The time taken by a pendulum for one oscillation is its ______.
4. Which instrument shows the distance covered by a vehicle?
5. Motion with changing speed is called ______ motion.
6. 1 hour = ______ seconds
7. Name two ways people measured time in the past.
8. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
9. Which instrument shows the speed of a vehicle?
10. A car covers 120 km in 2 hours. Find its speed.

Answer the questions.

1. A safety device that melts when too much current flows is a ______.
2. Who showed that current makes a compass needle move?
3. A coil of wire that becomes a magnet when current flows is an ______.
4. In a circuit, the bulb glows only when the switch is ______.
5. Why is a CFL or LED better than an ordinary bulb?
6. Which effect of current makes an electric bell ring?
7. Draw (or name) the symbol of an electric cell.
8. The wire in a heater is made of ______.
9. The heating effect of current is used in ______.
10. Which modern switch replaces the fuse?

Answer the questions.

1. Name the device that splits white light into seven colours.
2. A lens that is thicker in the middle is a ______ lens.
3. A lens that is thinner in the middle is a ______ lens.
4. Which mirror is used as the rear-view mirror in vehicles?
5. In a plane mirror, your right hand appears as the ______ hand.
6. The image in a plane mirror is ______ and the same size.
7. Which lens is used as a magnifying glass?
8. A spoon’s shiny inside surface acts like a ______ mirror.
9. Name a natural example of white light splitting into colours.
10. The angle of incidence is ______ to the angle of reflection.