Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. How do earthworms breathe?
2. The kidneys remove waste from blood as ______.
3. Which tissue carries food in plants?
4. Loss of water from leaves as vapour is called ______.
5. Breaking down food to release energy is called ______.
6. Blood vessels that carry blood away from the heart are ______.
7. How many chambers does the human heart have?
8. Yeast respires anaerobically and produces ______.
9. The red pigment in blood is ______.
10. Respiration without oxygen is called ______ respiration.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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