Science worksheets for Class 7 — with answers

Answer the questions.

1. Which gas is released during photosynthesis?
2. Name the raw materials for photosynthesis.
3. Plants like Cuscuta that take food from other plants are called ______.
4. Name an insectivorous plant.
5. Tiny pores on leaves are called ______.
6. Which organ produces bile?
7. Where is most food absorbed in our body?
8. Which animals chew the cud?
9. Lichens are a partnership of ______ and ______.
10. The process by which green plants make food is called ______.

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

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

Answer the questions.

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

Answer the questions.

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