Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

1. Name two good conductors of heat.
2. The degree of hotness of a body is called its ______.
3. Name two poor conductors of heat (insulators).
4. Why do we wear light-coloured clothes in summer?
5. Why do we wear dark clothes in winter?
6. Why does a clinical thermometer have a kink?
7. Heat moves through liquids and gases by ______.
8. The normal temperature of the human body is ______.
9. Heat moves through solids by ______.
10. Why do woollen clothes keep us warm?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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