Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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