Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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