Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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