Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

1. Why do we wear dark clothes in winter?
2. Name the three ways heat travels.
3. How does heat from the Sun reach us?
4. The normal temperature of the human body is ______.
5. The degree of hotness of a body is called its ______.
6. A wind blowing from the sea to the land is called a ______.
7. Name two good conductors of heat.
8. Why do woollen clothes keep us warm?
9. Name two poor conductors of heat (insulators).
10. Why does a clinical thermometer have a kink?

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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