Science worksheets for Class 7 — with answers

Answer the questions.

1. Which gas is released during photosynthesis?
2. Which animals chew the cud?
3. Name an insectivorous plant.
4. Name the raw materials for photosynthesis.
5. The process by which green plants make food is called ______.
6. Name the longest part of the alimentary canal.
7. How does an amoeba take in food?
8. Fungi that feed on dead matter are called ______.
9. Which organ produces bile?
10. Where does digestion of food begin in humans?

Answer the questions.

1. Name the three ways heat travels.
2. A wind blowing from the sea to the land is called a ______.
3. How does heat from the Sun reach us?
4. The degree of hotness of a body is called its ______.
5. Why do we wear dark clothes in winter?
6. The normal temperature of the human body is ______.
7. Why does a clinical thermometer have a kink?
8. Name two poor conductors of heat (insulators).
9. Heat moves through solids by ______.
10. Heat moves through liquids and gases by ______.

Answer the questions.

1. What colour does blue litmus turn in an acid?
2. Name a base used to treat acidity in the stomach.
3. Acids taste ______; bases taste ______.
4. What colour does red litmus turn in a base?
5. What is formed when an acid reacts with a base?
6. Turmeric turns ______ in a base.
7. Name a natural indicator.
8. Solutions that are neither acidic nor basic are ______.
9. Name an acid found in lemon.
10. Why do we rub baking soda on an ant bite?

Answer the questions.

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

Answer the questions.

1. How many chambers does the human heart have?
2. Which tissue carries food in plants?
3. Breaking down food to release energy is called ______.
4. The kidneys remove waste from blood as ______.
5. Blood vessels that carry blood away from the heart are ______.
6. Blood vessels that carry blood to the heart are ______.
7. How do earthworms breathe?
8. Loss of water from leaves as vapour is called ______.
9. Yeast respires anaerobically and produces ______.
10. Insects breathe through tiny holes called ______.

Answer the questions.

1. Speed = ______ ÷ ______
2. A train moves at 80 km/h for 3 hours. How far does it go?
3. Which instrument shows the speed of a vehicle?
4. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
5. The time taken by a pendulum for one oscillation is its ______.
6. A car covers 120 km in 2 hours. Find its speed.
7. Name two ways people measured time in the past.
8. A bus moves at 50 km/h. How long does it take to cover 200 km?
9. Motion with changing speed is called ______ motion.
10. 1 hour = ______ seconds

Answer the questions.

1. The wire in a heater is made of ______.
2. Which effect of current makes an electric bell ring?
3. Draw (or name) the symbol of an electric cell.
4. Two or more cells joined together make a ______.
5. In a circuit, the bulb glows only when the switch is ______.
6. Who showed that current makes a compass needle move?
7. A coil of wire that becomes a magnet when current flows is an ______.
8. Which modern switch replaces the fuse?
9. Why is a CFL or LED better than an ordinary bulb?
10. Name one use of an electromagnet.

Answer the questions.

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