Science worksheets for Class 7 — with answers

Answer the questions.

1. Name the raw materials for photosynthesis.
2. The process by which green plants make food is called ______.
3. Lichens are a partnership of ______ and ______.
4. Where does digestion of food begin in humans?
5. Name the longest part of the alimentary canal.
6. Which animals chew the cud?
7. Plants like Cuscuta that take food from other plants are called ______.
8. Which gas is released during photosynthesis?
9. Which organ produces bile?
10. How does an amoeba take in food?

Answer the questions.

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

Answer the questions.

1. Acids taste ______; bases taste ______.
2. Turmeric turns ______ in a base.
3. Name an acid found in lemon.
4. Name an acid found in curd.
5. Name a base used to treat acidity in the stomach.
6. What colour does red litmus turn in a base?
7. What is formed when an acid reacts with a base?
8. What colour does blue litmus turn in an acid?
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 tearing paper a physical or a chemical change?
3. Getting large crystals of a substance from its solution is called ______.
4. Is rusting of iron a physical or a chemical change?
5. Is burning of paper a physical or a chemical change?
6. What two things are needed for iron to rust?
7. Is dissolving sugar in water a physical or a chemical change?
8. What gas is formed when vinegar reacts with baking soda?
9. A change in which a new substance is formed is a ______ change.
10. Is melting of ice a physical or a chemical change?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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