Science worksheets for Class 7 — with answers

Answer the questions.

1. Where does digestion of food begin in humans?
2. Name the longest part of the alimentary canal.
3. Lichens are a partnership of ______ and ______.
4. Which animals chew the cud?
5. Fungi that feed on dead matter are called ______.
6. Which organ produces bile?
7. The process by which green plants make food is called ______.
8. Name an insectivorous plant.
9. Tiny pores on leaves are called ______.
10. Plants like Cuscuta that take food from other plants are called ______.

Answer the questions.

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

Answer the questions.

1. The reaction of an acid with a base is called ______.
2. What colour does red litmus turn in a base?
3. What is formed when an acid reacts with a base?
4. Name an acid found in lemon.
5. Vinegar contains ______ acid.
6. Turmeric turns ______ in a base.
7. Name an acid found in curd.
8. Name a natural indicator.
9. Acids taste ______; bases taste ______.
10. Why do we rub baking soda on an ant bite?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. A lens that is thinner in the middle is a ______ lens.
2. Name a natural example of white light splitting into colours.
3. A lens that is thicker in the middle is a ______ lens.
4. The angle of incidence is ______ to the angle of reflection.
5. Which mirror is used as the rear-view mirror in vehicles?
6. Which mirror do dentists use?
7. The splitting of white light into colours is called ______.
8. Name the device that splits white light into seven colours.
9. White light is made of ______ colours.
10. Which lens is used as a magnifying glass?