Science worksheets for Class 7 — with answers

Answer the questions.

1. The process by which green plants make food is called ______.
2. How does an amoeba take in food?
3. Name the longest part of the alimentary canal.
4. Where is most food absorbed in our body?
5. Which gas is released during photosynthesis?
6. Plants like Cuscuta that take food from other plants are called ______.
7. Lichens are a partnership of ______ and ______.
8. Where does digestion of food begin in humans?
9. Fungi that feed on dead matter are called ______.
10. Which organ produces bile?

Answer the questions.

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

Answer the questions.

1. Name an acid found in curd.
2. What colour does blue litmus turn in an acid?
3. What is formed when an acid reacts with a base?
4. Acids taste ______; bases taste ______.
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. Name a natural indicator.
9. The reaction of an acid with a base is called ______.
10. What colour does red litmus turn in a base?

Answer the questions.

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

Answer the questions.

1. How many chambers does the human heart have?
2. Loss of water from leaves as vapour is called ______.
3. Yeast respires anaerobically and produces ______.
4. Blood vessels that carry blood away from the heart are ______.
5. Insects breathe through tiny holes called ______.
6. Which tissue carries water in plants?
7. The kidneys remove waste from blood as ______.
8. Why do we get muscle cramps after heavy exercise?
9. Which tissue carries food in plants?
10. Respiration without oxygen is called ______ respiration.

Answer the questions.

1. Which instrument shows the distance covered by a vehicle?
2. Which instrument shows the speed of a vehicle?
3. Motion with changing speed is called ______ motion.
4. Speed = ______ ÷ ______
5. Name two ways people measured time in the past.
6. A car covers 120 km in 2 hours. Find its speed.
7. The time taken by a pendulum for one oscillation is its ______.
8. 1 hour = ______ seconds
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. A coil of wire that becomes a magnet when current flows is an ______.
2. In a circuit, the bulb glows only when the switch is ______.
3. Which effect of current makes an electric bell ring?
4. Which modern switch replaces the fuse?
5. The heating effect of current is used in ______.
6. Why is a CFL or LED better than an ordinary bulb?
7. Draw (or name) the symbol of an electric cell.
8. Two or more cells joined together make a ______.
9. Who showed that current makes a compass needle move?
10. A safety device that melts when too much current flows is a ______.

Answer the questions.

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