Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Name one way to prevent rusting.
2. Is cooking food a physical or a chemical change?
3. A change in which a new substance is formed is a ______ change.
4. Is tearing paper a physical or a chemical change?
5. Coating iron with zinc is called ______.
6. Is melting of ice a physical or a chemical change?
7. Getting large crystals of a substance from its solution is called ______.
8. What gas is formed when vinegar reacts with baking soda?
9. Is dissolving sugar in water a physical or a chemical change?
10. Is rusting of iron a physical or a chemical change?

Answer the questions.

1. Blood vessels that carry blood to the heart are ______.
2. Which tissue carries food in plants?
3. Which tissue carries water in plants?
4. How do earthworms breathe?
5. Blood vessels that carry blood away from the heart are ______.
6. Respiration without oxygen is called ______ respiration.
7. Breaking down food to release energy is called ______.
8. Yeast respires anaerobically and produces ______.
9. The red pigment in blood is ______.
10. Why do we get muscle cramps after heavy exercise?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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