Science worksheets for Class 7 — with answers

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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

Answer the questions.

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