Science worksheets for Class 7 — with answers

Answer the questions.

1. Where does digestion of food begin in humans?
2. Plants like Cuscuta that take food from other plants are called ______.
3. Name an insectivorous plant.
4. Name the raw materials for photosynthesis.
5. Which organ produces bile?
6. How does an amoeba take in food?
7. Tiny pores on leaves are called ______.
8. Which animals chew the cud?
9. Fungi that feed on dead matter are called ______.
10. Where is most food absorbed in our body?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Which tissue carries food in plants?
2. Yeast respires anaerobically and produces ______.
3. Blood vessels that carry blood to the heart are ______.
4. Why do we get muscle cramps after heavy exercise?
5. The red pigment in blood is ______.
6. Blood vessels that carry blood away from the heart are ______.
7. How do earthworms breathe?
8. Which tissue carries water in plants?
9. Insects breathe through tiny holes called ______.
10. Breaking down food to release energy is called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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