Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Name an acid found in curd.
2. Turmeric turns ______ in a base.
3. Acids taste ______; bases taste ______.
4. Name a natural indicator.
5. Vinegar contains ______ acid.
6. Name a base used to treat acidity in the stomach.
7. Solutions that are neither acidic nor basic are ______.
8. The reaction of an acid with a base is called ______.
9. Name an acid found in lemon.
10. What is formed when an acid reacts with a base?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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