Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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