Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

1. Why do we rub baking soda on an ant bite?
2. Name an acid found in curd.
3. Turmeric turns ______ in a base.
4. Acids taste ______; bases taste ______.
5. Vinegar contains ______ acid.
6. Name a natural indicator.
7. Solutions that are neither acidic nor basic are ______.
8. What colour does blue litmus turn in an acid?
9. Name a base used to treat acidity in the stomach.
10. What is formed when an acid reacts with a base?

Answer the questions.

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

Answer the questions.

1. How many chambers does the human heart have?
2. Blood vessels that carry blood away from the heart are ______.
3. Loss of water from leaves as vapour is called ______.
4. Blood vessels that carry blood to the heart are ______.
5. Which tissue carries food in plants?
6. How do earthworms breathe?
7. Yeast respires anaerobically and produces ______.
8. The red pigment in blood is ______.
9. The kidneys remove waste from blood as ______.
10. Why do we get muscle cramps after heavy exercise?

Answer the questions.

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

Answer the questions.

1. Which effect of current makes an electric bell ring?
2. Two or more cells joined together make a ______.
3. In a circuit, the bulb glows only when the switch is ______.
4. Why is a CFL or LED better than an ordinary bulb?
5. A coil of wire that becomes a magnet when current flows is an ______.
6. Which modern switch replaces the fuse?
7. Who showed that current makes a compass needle move?
8. The wire in a heater is made of ______.
9. A safety device that melts when too much current flows is a ______.
10. The heating effect of current is used in ______.

Answer the questions.

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