Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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