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. Plants like Cuscuta that take food from other plants are called ______.
4. Name an insectivorous plant.
5. Which gas is released during photosynthesis?
6. Name the raw materials for photosynthesis.
7. Where is most food absorbed in our body?
8. Lichens are a partnership of ______ and ______.
9. How does an amoeba take in food?
10. Which animals chew the cud?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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