Science worksheets for Class 7 — with answers

Answer the questions.

1. Which organ produces bile?
2. Where does digestion of food begin in humans?
3. Name an insectivorous plant.
4. Lichens are a partnership of ______ and ______.
5. Tiny pores on leaves are called ______.
6. Fungi that feed on dead matter are called ______.
7. Name the longest part of the alimentary canal.
8. The process by which green plants make food is called ______.
9. Where is most food absorbed in our body?
10. Which gas is released during photosynthesis?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Which tissue carries food in plants?
2. Respiration without oxygen is called ______ respiration.
3. Loss of water from leaves as vapour is called ______.
4. How many chambers does the human heart have?
5. Blood vessels that carry blood away from the heart are ______.
6. How do earthworms breathe?
7. Yeast respires anaerobically and produces ______.
8. Why do we get muscle cramps after heavy exercise?
9. Which tissue carries water in plants?
10. Blood vessels that carry blood to the heart are ______.

Answer the questions.

1. A cyclist covers 900 m in 3 minutes. Find the speed in m/min.
2. A bus moves at 50 km/h. How long does it take to cover 200 km?
3. A train moves at 80 km/h for 3 hours. How far does it go?
4. A car covers 120 km in 2 hours. Find its speed.
5. Which instrument shows the distance covered by a vehicle?
6. Speed = ______ ÷ ______
7. Which instrument shows the speed of a vehicle?
8. Name two ways people measured time in the past.
9. The time taken by a pendulum for one oscillation is its ______.
10. What is the SI unit of speed?

Answer the questions.

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

Answer the questions.

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